niu N-GT Service Manual
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niu N-GT Service Manual

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Table of Contents

N-GT Scooter
Dual batteries + Fast Charger
Service Manual
e13*168/2013*00546*00
Jiangsu Niu Electric Technology Co. Ltd
1
V1.0.0

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Summary of Contents for niu N-GT

  • Page 1 N-GT Scooter Dual batteries + Fast Charger Service Manual e13*168/2013*00546*00 Jiangsu Niu Electric Technology Co. Ltd V1.0.0...

  • Page 2: Foreword

    Niu must be verified. Please make replacement with original electric components made by Niu or equivalents that have corresponding part numbers. We strongly recommend you not to use inferior components.
  • Page 3 Importance Safety Notes Make sure that you have completely understood basic workshop operation safety procedures and taken on proper protective clothes and are provided with safety equipment. Extra attention should be paid to the following in the implementation of a maintenance task: •...

  • Page 4: Table Of Contents

    Contents Foreword Maintenance Rules and Important notes Cable connector inspection Scooter Identification Specifications Part Names Parts Removal and Installation Procedure Front Wheel Front Fork Steering Handlebar Rear Wheel/ Rear Suspension Brake System Lithium battery/charger BCS and Fast Charger Electrical System Electronic components Diagnostic Code Regular Maintenance Checklist...
  • Page 5 Important notes 1．Please use original parts made by Niu. Use of components that are not in compliance with design specifications by Niu Company may cause damages to the scooter. 2．Maintenance operations can be performed only with metric tools. The metric bolts, nuts and screws can not be interchanged with British fasteners.

  • Page 6: Cable Connector Inspection

    Cable connector inspection Loose cables constitute a risk to electric safety. Cables should be checked after their clamping to • ensure electric safety. • Bending of cable clamps towards welding points is not allowed. Cables are bound at designated positions. •...

  • Page 7: Scooter Identification

    Scooter Identification Vehicle serial number (SN) is in the user manual • The scooter frame identification code (VIN) is made on the rear frame at rear seat cask. • The motor code is made at left side of the wheel-hub motor. V1.0.0...

  • Page 8: Specifications

    Overall specifications： EU approval number: e13*168/2013*00546*00 Item Specifications Length × width × height 1815×725×1185 mm Wheelbase 1290mm Complete vehicle kerb mass 90Kg Dimensions Ground clearance of the 740mm seat cushion Ground clearance 140mm Type of the scooter frame The pedal type made with combined Scooter frame welding of panels and pipes Specifications of the front...
  • Page 9 Specifications of the motor controller system Item Specifications Motor type Brushless permanent-magnet motor Controller type FOC vector control Rated voltage DC60V Motor Rated power 3000W Maximum motor power 3500W at 639min Maximum motor torque 52N.M at 630min Rated voltage DC60V Rated output power 2500W Controller...
  • Page 10 Specifications of the braking system Item Standard value (mm) Minimum Thickness(mm) Diameter of the front brake disc φ220mm Thickness of the front brake disc Thickness of the front brake pad brake fluid DOT3 or DOT4 Diameter of the rear brake disc φ180mm Thickness of the rear brake disc Thickness of the rear brake pad...

  • Page 11: Part Names

    Part Names Scooter body Left/Right Windshield Body Panel Saddle Front Neck Cover Front Central Front Panel Cover Rear Headlight Left/Right Handrail Tail light Front Fender Battery Cover Rear Fender Left/Right Central Left/Right Side Front Left/Right Cover Panel Panel Rear Central Footrest Cover V1.0.0...

  • Page 12: Parts Removal And Installation Procedure

    Parts Removal and Installation Procedure Procedures for removal and installation of scooter body panels are described in this section. The ignition switch and main switch (if applicable) must be turned to OFF before disconnection or connection of electric units, when the storage battery has been installed onto the scooter. Note •...
  • Page 13 Section 3. Front Panel 3.1 Unscrew two screws on the top of Front Panel 3.2 Take out two Push-in Rivets from the bottom of Front Panel 3.3 Remove Front Panel by pushing it upward V1.0.0...
  • Page 14 Section 4. Under Seat Storage Compartment 4.1 Unscrew four screws in the Under Seat Storage Compartment 4.2 Lift up the Under Seat Storage Compartment, disconnect the two connectors 4.3 Pull Battery Compartment Lock cable V1.0.0...
  • Page 15 Section 5. Rear Central Cover 5.1 Unscrew the left side screw 5.2 Unscrew the right side screw 5.3 Pull out the rubber cover and unscrew the screw 5.4 Pull out Rear Central Cover carefully V1.0.0...
  • Page 16 Section 6. Battery Compartment Cover and Footrest 6.1 Pull out the footrest plug and unscrew two hexagon flange bolt 6.2 Unscrew four cross recessed pan head tapping screws and remove Battery Compartment Cover 6.3 Unscrew two hexagon flange bolts 6.4 Unscrew right side screw V1.0.0...
  • Page 17 Section 6. Battery Compartment Cover and Footrest 6.5 Unscrew left side screw 6.6 Pull out the Footrest V1.0.0...
  • Page 18 Section 7. Side Panel 7.1 Unscrew left side screw 7.2 Unscrew two screws in dark side 7.3 Pull out the whole side panel V1.0.0...
  • Page 19 Section 8. Handrail 8.1 Remove four Hexagon flange bolts marked in the guide photo 8.2 Pull out the Handrail V1.0.0...
  • Page 20 Section 9. End cap and Body Cover 9.1 Unscrew four cross recessed medium pan head bolts 9.2 Unscrew Cross recessed pan head tapping screw 9.3 Unscrew two cross recessed pan head tapping screws 9.4 Pull out the whole body panel V1.0.0...
  • Page 21 Section 10. Left/Right Central Cover and Foot pegs 10.1 Unscrew the Cross recessed pan head tapping screw 10.2 Unscrew the Cross recessed medium pan head bolt 10.3 Pull out the whole Left/Right Central Cover V1.0.0...
  • Page 22 Section 10. Left/Right Central Cover and Foot pegs 10.4 Remove two socket head bolts 10.5 Take out the Foot Pegs V1.0.0...
  • Page 23 Section 11. Front Left/Right Panel 11.1 Pull out two front glove compartment bolt hole plugs and unscrew the cross recessed pan head tapping screw inside 11.2 Take out Plastic Expansion Clips from the bottom of Front Left/Right Panel 11.3 Unscrew three screws in the right picture which line out red circle V1.0.0...
  • Page 24 Section 11. Front Left/Right Panel 11.4 Unscrew the screw on the top of Front Right/Left Panel 11.5 Have a close-up view of panel jack and take out panel carefully V1.0.0...
  • Page 25 Section 12. Helmet Hook 12.1 Unscrew the cross recessed medium pan head bolt 12.1 Pull the Helmet Hook out V1.0.0...
  • Page 26 Section 13. Front Central Cover 13.1 Unscrew two cross recessed pan head bolt 13.2 Unscrew the power lock cover screw and take out the cover 13.3 Unplug USB output cable 13.4 Take out whole Front Central Cover V1.0.0...
  • Page 27 Section 14. Power Lock 14.1 Unscrew three Cross recessed pan head bolts 14.2 Unplug the Power Lock connector and take out the Power Lock V1.0.0...
  • Page 28 Section 15. Front Wheel Cover 15.1 Unscrew 2 Cross recessed medium pan head screw and 2 Cross recessed pan head tapping screw 15.2 Pull out the whole front wheel cover V1.0.0...
  • Page 29 Section 16. Display 16.1 Unscrew three Hexagon flange nuts 16.2 Unplug dashboard cable and take out the Display V1.0.0...
  • Page 30 Section 17. Brake System 17.1 Unscrew two Hexagon socket head stepped bolts marked in the guide photo 17.2 Pull out the cover 17.3 Plug Brake connector V1.0.0...
  • Page 31 Section 17. Brake System 17.4 Unscrew one cross recessed pan head bolt and two Hexagon flange bolts then take out front Brake System 17.5 Unscrew two Hexagon socket head stepped bolts marked in the guide photo 17.6 Unscrew two cross recessed pan head bolt and take out Rear Brake System V1.0.0...
  • Page 32 Section 18. Side Stand and Side Stand Switch 18.1 Unscrew the screw and unplug the connector marked in guide photo to take out the side stand switch 18.2 Unscrew the side stand screw and take out the side stand and spring （spring hook on the red circle when installation) V1.0.0...
  • Page 33 Section 19. Front Fender and Rear Fender 19.1 Unscrew two Hexagon flange bolts on the left and right sides then take out the Rear Fender 19.2 Unscrew two Cross recessed medium pan head bolts on the left and right sides then take out the Front Fender V1.0.0...
  • Page 34 Section 20. Motor 20.1 Unscrew two hexagon flange bolts on the left and right side 20.2 Remove the motor connectors on FOC controller V1.0.0...
  • Page 35 Section 20. Motor 20.3 Unplug the motor hall connector（ Scooters produced before 2016 Dec ) then pull out Motor V1.0.0...
  • Page 36 Front Wheel 1. Hexagon Nuts With Flange,Style2-Fine Pitch Thread 2. Front Wheel Axle sleeve 3. Front disk brake lower pump brake pad 4.Front brake lower fluid pump 5. Front brake disk 6.Front Alloy Wheel 7Front tire 8 Value 9 Front wheel axle Specifications of the front tire: 90/90-12 Installation torque value for screw 11 in the figure: 8Nm...

  • Page 37: Front Wheel

    Front Wheel Failure diagnosis The tire pressure is too low. There is air leakage from the tire. The tire pressure is insufficient. The front axle is deflected. The front wheel tire is deformed and the tire is deflected. The front wheel oscillates. The wheel is deformed.
  • Page 38 Front Fork Assembly Specifications of the Front Fork Installation torque value for screw 4 in the figure: 28Nm 1. Front left and right reflectors 2 Front Fender 3 Front fork assembly including shock absorb 4 Fluid Tube Clip 5 – 6 7 pieces of direction bearing V1.0.0...

  • Page 39: Front Fork

    Front Fork Failure diagnosis The front fork is deflected. There is an abnormal noise from the front shock absorber. Bolts on the shock absorber are loosened. The liquid in the front shock absorber is insufficient. Disassembling Remove the panel, front journal lid and front fender. Remove the steering handle assembly.
  • Page 40 Steering Handlebar Left 1. Left handle 2. Brake level 3. Left review mirror 4 left turn signal assembly 5. Fixing bracket of turn signal 6 Rear disc brake Top Fluid Reservoir 7. Combination Switch 8 Handlebar V1.0.0...
  • Page 41 Steering Handlebar Right 1.Speed regulating steering handle 2. Brake level 3. Right review mirror 4 Right turn signal assembly 5. Fixing bracket of turn signal 6 Rear disc brake Top Fluid Reservoir 7. Right Combination Switch V1.0.0...
  • Page 42 Steering Handlebar Middle 1.Dashboard Windshield 2 NGT Dashboard Assembly 3 Dashboard Bracket 4 Handlebar fixing upper block 5 Hexagon socket head stepped bolt 6 Handlebar fixing lower block 7 T-Plate Specifications of the Steering Handlebar Installation torque value for screw 16 in the figure: 52Nm Front/Rear Brake Lever free travel distance：7-15mm Twist Grip free travel distance：...

  • Page 43: Steering Handlebar

    Steering Handlebar Failure diagnosis The steering handle is difficult to turn. The steering handle bearing failed. The steering handle bearing is damaged. Steering is unstable The steering handle bearing is damaged. Disassembling Remove the left and right rear-view mirror assemblies (5) and (11). Remove the left and right grasp handle assemblies (1) and (12).
  • Page 44 Electronic Components 1. Power Lock 2. Alarm 3.DC to DC A 4. Horn 5.U3LTE ECU 6. Main harness assembly 7.LCU 8.CBS V1.0.0...
  • Page 45 Rear components 1. FOC motor controller 2 Saddle Lock 3 BCS V1.0.0...

  • Page 46: Rear Wheel/ Rear Suspension

    Rear Wheel 1. Rear disc brake pad 2 Rear disc brake lower fluid pump 3 Value 4 Rear brake disc 5 Motor (3000W) 6 Rear Tire Diameter of the rear brake disc: φ180mm Thickness of the rear brake disc: 3.5mm Operating limit: 2.5mm Torque value for Top Bolts on the rear shock absorber: 44Nm Torque value for Bottom Bolts on the rear shock absorber: 28Nm...
  • Page 47 Failure diagnosis Oscillation of the rear wheel Deformation of the motor rim Motor failure Motor un-tightened Bearing loosened or worn Insufficient tyre pressure Shock absorber softened excessively Insufficient spring elasticity Oil leakage from shock absorber No elasticity of the rear shock absorber spring Extremely low tyre pressure Shock absorber hardened excessively Shock absorber rod deflected...

  • Page 48: Brake System

    Brake System Maintenance instruction Note • There should be no oil stains on the brake assembly in installing or removal. • The cleaning should be made with a specified detergent to avoid reduction of the brake performance. • Oil stains on the brake pad will result in reduction of the brake performance •...
  • Page 49 Failure diagnosis Failure of the hydraulic disc brake Check the brake liquid level in the main brake pump reservoir. The brake liquid level is below the lower The brake liquid level is above the lower limit scale in the reservoir. limit scale in the reservoir.
  • Page 50 Failure diagnosis The brake performance is not good. The brake is not adjusted properly. The brake pad and brake disc are worn. The brake assembly is not installed properly. The brake pad and brake disc are contaminated. The brake responds slowly or the handle is tight. The brake is not adjusted properly.
  • Page 51 Brake System Brake liquid change/air discharging (for the disc brake type) Drainage of the brake liquid The paint coatings, plastics or rubber parts should be covered with cloths as good as possible to avoid splash of the brake liquid onto them in changing the system liquid or draining the liquid. There should be no foreign matters that enter into the system in liquid injection into the liquid reservoir.
  • Page 52 Brake liquid injection/air discharging The following operation steps can be performed if air discharge pumps are not available. Hold the front brake handle tightly and pressurize the system until there are no air bubbles from the liquid reservoir hole and the resistance to the front brake handle is felt. Connect the oil drainage hose to the oil drainage screw, and perform air discharging from the system as per the following steps: Check the brake liquid level frequently in air discharging to avoid air entrance into the hydraulic...

  • Page 53: Lithium Battery/Charger

    Lithium battery/charger Overview The charger will be generate heat during charging. It should be subject to good ventilation and radiation. The battery and charger must not be covered. They must not be close to flammable or explosive objects in charging to avoid the explosion or fire that may cause personal injuries.
  • Page 54 Battery Pack Battery Model Charger input/output Serial number of the battery pack Operation/maintenance instruction NGT-Battery Capacity:60V 35Ah Panasonic / 18650 Battery Weight: 11KG Battery Pack Quantity: 2 Max Speed: 70KM/h When battery level lower than 15%, the speed will limit to 20KM/h V1.0.0...
  • Page 55 BCS（Battery Control System- Dual Switch Controller) The BCS device is used to control the output and input of dual batteries and communicates with ECU. V1.0.0...
  • Page 56 The cabling diagram of BCS Remove the cover 2+: Battery2 to check the positive pole cabling 2-: Battery2 Negative pole BCS connector with Main Harness S+: BCS output positive pole 1+: Battery1 positive pole S-: BCS output negative pole 1-: Battery1 Negative pole V1.0.0...
  • Page 57 Fast Charger Charger Specification: Input: 100-240V AC, 12A max Output: 35-84V DC,12A max Operate Temperature: -10-40℃ The charger should be disconnected first from the power supply and then disconnect from the battery. The fast charger can be used onboard charging port. Spec: Red constantly on: Charging Red flash: In fault status...
  • Page 58 Use H1 can query BMS info to troubleshoot for Battery pack How to use H1, please check H1 User Manual V1.0.0...
  • Page 59 BMS (Battery Management System) Description Connect H1 to Battery Pack directly, Press BMS_Info Icon to Read BMS Information Then press the screen to continue If BMS is working normal/abnormal, H1 will read Battery Pack info shown as below. Replace the BMS if OFFLINE is shown. BMS_STATE: No Load BMS Status: currently not in use ONLINE...
  • Page 60 Table of BMS STATE(BMS Status) No Load: Discharging: Charging: Over-Charged: Over-Discharged: Charging Over-Current Discharging Over-Current Over Temperature Temperature Low Other Warning(Open Circuit detected/ Difference between Cell Voltages is higher than 0.3V.If the difference value is higher than 0.05V and lower than 0.3V, BMS would automatically start voltage balance mode) Short Circuit Water Detected...
  • Page 61 For detail about work principle of scooter, please refer to Circuit Diagram and Wiring Diagram. V1.0.0...
  • Page 62 How to check Main Harness communication wire for closed circuit (Ref: 005) Check communication between ECU and Battery Step 1: Disconnect the main Battery Step 2: Disconnect the ECU connector Step 3: Connect negative pin of multimeter to pin 5 (White) of ECU female connector Step 4: Connect positive pin of multimeter to the pin of power cord shown above( white and grey) Step 5: Set multimeter to test closed circuit mode which should beep if the circuit is closed.
  • Page 63 Check communication between ECU and Display Step 1: Disconnect the main Battery Step 2: Disconnect the ECU connector Step 3: Connect negative pin of multimeter to pin 3(grey and violet) of ECU female connector Step 4: Connect positive pin of multimeter to the pin 6(grey and violet) of Display connector Step 5: Set multimeter to test closed circuit mode which should beep if the circuit is closed Alternative Method: Please refer to <How to Read Vehicle Communication Data>...

  • Page 64: Electrical System

    Electrical System Motor The motor used in this scooter is an efficient brushless DC motor with a permanent magnet made of rare earths, which is integrated with the rear wheel. The motor does not require maintenance in daily riding. However, attention should be paid to the status of installation and tightening nuts on the motor shaft.
  • Page 65 Component name Motor Connector code J25-A Disassembling order：Section 4>20 Connector Definition Color Definition Phase Blue Green Phase Yellow Phase Motor Hall Black Power cord Phase Blue Phase Green Phase Yellow Negative cord V1.0.0...
  • Page 66 How to replace Motor (Ref: 009) Preparation： Remove section 4 first 1. Screw up two hexagon flange bolts on the left and right side 2. Install the motor connectors on FOC controller 3. Connect the motor hall connector（ Scooters produced before 2016 Dec ) V1.0.0...
  • Page 67 FOC Controller The controller for this model makes controlling in the way that it receives the signal from speed regulation handle and controls operation of the brushless DC motor. Main protective functions 1. Current limit protection The maximum controller output current is limited to protect the motor, controller, battery and other components from being damaged by a current greater than specified.
  • Page 68 [E4]FOC controller Component Name [E4]FOC Controller Connector Code J26-A Connector Type Connector 30P-J2X Disassembling order：Section 4 Connector Definition Color Definition White and yellow Mode 1 Mode 2 White and blue White and black Mode 3 Blue EABS earth Orange ACC power lock Violet Brake lamp Blue...
  • Page 69 Simple Schematic Diagram Circuit V1.0.0...
  • Page 70 How to read FOC controller indicator flashing frequency (Ref: 001) • Turn ON the power and count how many times the indicator flashes between each interval. • If FOC controller is in good working condition, after turning ON the power, the indicator should only flash once and no more flashing FOC Controller Flashing Indicator Explanation Flashing...
  • Page 71 How to check FOC Controller power input (Ref: 013) Step 1: Turn the power OFF. Step 2: Check voltage of the main power cord by disconnecting the following connectors: - FOC Controller connector Red and Black wires Step 3：Check DC voltage between the Red wire and Black（Negative）at harness side. Step 4：Turn the power ON and DC voltage reading on multimeter should be same as battery voltage.
  • Page 72 How to check FOC controller ACC wire of Alarm for closed circuit (Ref: 007) Step 1: Turn the power ON. Step 2: Check voltage of the PIN 10 orange（ACC power lock）by disconnecting the following connectors: - FOC Controller connector Red and Black wires Step 3：Check DC voltage between the PIN 10 orange（ACC power lock）...
  • Page 73 How to replace FOC controller (Ref: 004) V1.0.0...
  • Page 74 [E4]Speed regulating steering handle (Right) [E4]Speed regulating Component Name Connector Code steering handle (right) Connector Definition Color Definition White and green Signal wire Dark Red Power cord（5V） Black Negative electrode V1.0.0...
  • Page 75 How to check Hall Cable Sensor(Ref: 011) Inspection of the signal output Step 1：Turn the power lock switch to OFF. Step 2：Remove the front panel. Step 3：Connect the multimeter between the white/green signal output wire and the black ground wire on Hall cable sensor. Turn the ignition switch to ON.
  • Page 76 How to check Euro 4 Speed regulating steering handle (right) Inspection of the signal output Step 1：Turn the power lock switch to ON. Step 2：Remove the front panel. Step 3：Connect the multimeter between the white/green signal output wire and the black ground wire on Speed regulating steering handle.
  • Page 77 How to replace Hall Cable Sensor（Ref: 012) 1. Pull out the cable of Twist Grip 2. Unscrew four screws and disconnect the connector of hall cable sensor shown in the picture 3. Reassemble Hall Cable Sensor is reverse order V1.0.0...
  • Page 78 CBS: Combined Braking System The division of brake force by CBS is front 30% and rear 70% V1.0.0...
  • Page 79 DC to DC Component Name DC-DC Converter Disassembling order：Section 2>3 Connector Code J12-A Color Definition Red and green 60V input wire to the converter Black Negative electrode Black Negative electrode Red and white Power cord (12V) V1.0.0...
  • Page 80 How to check DC-DC Converter power input (Ref: 015) Step 1: Turn the power ON. Step 2：Check DC voltage between the Red wire and Black（Negative）at component side. Step 3：DC voltage reading on multimeter should be same as battery voltage（~71.4V） How to check DC-DC Converter power output (Ref: 016) Step 1: Turn the power ON.
  • Page 81 NGT Alarm Component Name Alarm Disassembling order：Section 2>3 Connector Code J3-A Color Definition Red and white Power cord (12V) Red and green Power cord (60V) Yellow Left turn signal lamp wire Power Lock Pink Yellow 1 Alarm signal Light blue Right turn signal lamp wire Orange Controller ACC...
  • Page 82 How to check Alarm （Ref: 017) Step 1: Press buttons of the remote, the remoter indicator should light up, if not, use the backup remoter or Check the remoter battery Step 2: if the siren doesn’t work after pressing the remote buttons, then replace the alarm Step 3: if both siren and lights work after pressing remote buttons, then check alarm voltage input/ output Step 4：Use a multimeter and set to DC，measure alarm voltage input(Negative to Black wire,...
  • Page 83 How to replace Alarm （Ref: 008) 1. Unscrew the two screws as guide picture 3. Disconnect the connector of Alarm 3. Reassemble Alarm is reverse order V1.0.0...
  • Page 84 [E4]Lamp control unit Euro 4 scooter replace the flasher with LCU（lamp control unit） [E4] Lamp control unit Component Name Connector Code J14-A Disassembling order：Section 2>3 Color Definition Blue 1 Distance light White 1 Switch overtaking Black Cathode Yellow 1 Turn switch left Light blue 1 Turn switch right Gray...
  • Page 85 Light sensation 1 White 485 A Light sensation 2 Pink Electric lock key Red white Red white Black Ground Light blue Turn right Black Ground Yellow Turn left Black 1 Lock hole lamp White Lower beam Red 1 Lock hole lamp 1 Blue Upper beam V1.0.0...
  • Page 86 Component Name Power Lock Connector Code J11-A Disassembling order：Section 2>3>4>5>6>7>11>14 Component side Connector Code J11-A Color Definition Power cord（60V） Black Power Lock On/Off Connector Code J11-B Harness side Color Definition Power cord（60V） Pink Electrical lock key V1.0.0...
  • Page 87 How to check Power Lock （Ref: 020) Step 1：Check DC voltage between Pink wire and Red wire Step 2：DC voltage reading on multimeter should be same as battery voltage If battery voltage does not exist, replace the power lock. V1.0.0...
  • Page 88 NGT ECU Component Name U3 LTE Connector Code J2-A Disassembling order：Section 2>3 Connector Definition Color Definition Power cord(60V) Pink Power Lock On/Off Violet and Grey Communication B Black Negative electrode White and Grey Communication A Black and white 485 Ground wire Yellow and Red Alarm signal Yellow and white...
  • Page 89 The indicator definition of ECU GPS indicator: Green flash: GPS work normal Green is always on: NO GPS Green is off: GPS doesn’t work LTE indicator: Blue flash: Communication Network normal Blue is always on: Can not connect to the network. No Signal or Signal is weak.
  • Page 90 How to check ECU by checking App Data (Ref: 002) • This method only applied to scooter with activated SIM card • Log into NIU E-scooter App to check latest data update, replace ECU if data is not up to date How to replace ECU (Ref: 003) V1.0.0...
  • Page 91 V1.0.0...
  • Page 92 Vehicle Frame Number, Vehicle SN and mobile number which was banned on the App. Step 10: Update ECU with latest program by H1 Step 11: Check App status after 24 hours or contact questions@niu.com for help. V1.0.0...
  • Page 93 USB Port Component Name Connector Code J5-A Disassembling order：Section 2>3>4>5>6>7>11>12>13 Connector Definition Color Definition Power cord（60V） Black Negative electrode V1.0.0...
  • Page 94 [E4] Left combination switch [E4]Left combination Component Name Connector Code switch J1-A Connector Type Disassembling order：Section 2>3 Connector Definition Color Definition Blue 1 Distance light White 1 Headlight overtaking Black Cathode Dark green Horn Red white Light blue 1 Turn switch right Yellow 1 Turn switch left Grey...
  • Page 95 How to check Left Combination Switch Functions（Ref: 022) Example: Check the Low Beam Step 1：Turn the power ON Step 2：Check DC voltage between PIN 6 White wire（Low Beam） and Black wire of another connector(ie Negative pin of Headlight) Step 3：DC voltage reading on multimeter should be around 12V when the corresponding switch is Other switch detection methods are the similar,check the corresponding wire and DC voltage should be around stable 12V.
  • Page 96 [E4] Right combination switch [E4]Right combination Component Name Connector Code switch J2-A Disassembling order：Section 2>3 Connector Definition Color Definition White and yellow Shift down White and blue Shift up Black Cathode Black Cathode Black Cathode Light green Double flash Brown Startup button V1.0.0...
  • Page 97 How to check Right Combination Switch Functions（Ref: 021) example: Check the Hazard Light Switch Step 1：Turn the power ON Step 2：Check for closed circuit between PIN 5 Blue/White wire（Hazard Lights) and Black wire Step 3：the multimeter should beep if the circuit is closed. Other switch detection methods are the similar.
  • Page 98 NGT Headlight- Same type with N1S Sport Component Name Headlight Connector Code J13-A Disassembling order：Section 2>3 Connector Definition Color Definition White Low beam Blue High beam Red and white Power cord (12V) Black Negative electrode V1.0.0...
  • Page 99 How to check Headlight Power Input（Ref: 023) Step 1：Turn the power ON Step 2：Check DC voltage between Red-White wire and Black wire Step 3：DC voltage reading on multimeter should be ~12V If 12V exist but Headlight does not illuminate, replace Headlight If 12V does not exist, harness is broken V1.0.0...
  • Page 100 Direction Indicators Left/Right turn signal Component Name Connector Code lamp J7-A Disassembling order：Section 2>3 Connector Definition Color Definition Yellow Left turn signal lamp Black Negative electrode Component Name Right turn signal lamp Connector Code J8-A Disassembling order：Section 2>3 Connector Definition Color Definition Light blue...
  • Page 101 How to check Left turn signal lamp（Ref: 024) Step 1：Make the Flasher connector PIN2(Grey) and PIN3(Red/White) shorted with a short wire. Step 2: Disconnect the Left turn signal lamp connector Step 3: Turn the power ON and then turn the left turn switch ON Step 4: Check DC voltage between Yellow wire and Black wire on harness side Step 5: DC voltage reading on multimeter should be ~12V How to check Right turn signal lamp（Ref: 025)
  • Page 102 Tail Light Component Name Tail Light Connector Code J9-A Disassembling order：Section 2>3 Connector Definition Color Definition Black Negative electrode Yellow Left lamp signal wire Red and white Power cord (12V) Violet Brake lamp Light blue Right lamp signal wire V1.0.0...
  • Page 103 How to check Tail Light power input（Ref: 026) Step 1：Turn the power ON Step 2：Check DC voltage between Red/White wire and Black wire on harness side Step 3：DC voltage reading on multimeter should be around~12V Step 4：Press the brake，DC voltage reading on multimeter should also be around~12V If 12V exist and Tail light does not illuminate，then replace the taillight V1.0.0...
  • Page 104 Side Stand Component Name Connector Code Side Stand Switch Disassembling order：Section 4>5>6>7 Connector Definition Color Definition Power cord（5V） Yellow Side Stand Switch signal Black Negative electrode Manufactured From 05-2016 to 12-2016 Manufactured From 01-2017 ~current V1.0.0...
  • Page 105 Prop Stand: If the prop stand is extended,the electronic motor is cut-off. It cannot be restarted until the prop stand is moved into its retracted position. How to check Side Stand Switc（Ref: 027) Step 1: Disconnect the connector to Check power input; Check DC voltage between Red wire and Black wire on harness side, Voltage reading should be ~5V Step 2: Turn the power ON...
  • Page 106 Horn Component Name Horn Connector Code Disassembling order：Section 2>3 Connector Definition Color Definition Green Horn Black Negative electrode V1.0.0...
  • Page 107 Brake Switch Component Name Left/right brake Switch Connector Code J16-B Disassembling order：Section 2>3 Connector Definition Color Definition Power cord(12V) Violet(harness side） Left/right brake handle signal wire V1.0.0...
  • Page 108 How to check Brake Switch（Ref: 028) Step 1：Disconnect the Red and Black wires of the Brake Switch connector Step 2：Connect Multimeter Positive and Negative pins to the connectors and Set multimeter to test closed circuit mode, then pull the brake, the multimeter should beep if the Brake Switch is working.
  • Page 109 Charging Port Component Name Charging Port Connector Code J10-A Disassembling order：Section 4 Connector Definition Color Definition Power cord (60V) Black Negative electrode Purple and Grey Communication B White and Grey Communication A Black and White 485 Earth V1.0.0...
  • Page 110 How to check Charging Port closed circuit（Ref: 029) Step 1：Remove the Under Seat Storage Compartment and find the charging port connector Step 2：Test closed circuit between Positive side in the seat storage and the component side Step 3：Multimeter should beep if Charging port working normally V1.0.0...
  • Page 111 Dashboard Component Name Display Assembly Connector Code J6-A Disassembling order：Section 2>3 Connector Definition Color Definition Red and white Power cord (12V) Light blue Right turn lamp White and grey Communication A Black Negative electrode Blue High beam Violet and gray Communication B Yellow Left turn lamp...
  • Page 112 Dashboard NGT uses a colorful LED large screen. The backlight will adjust according to the illumination intensity. When the illumination intensity is high, the backlight will be white. When it is low, the backlight will be changed according to the illumination. Status in Charging V1.0.0...
  • Page 113 Dashboard Status in normal When the two batteries voltage difference is less than 0.8V,it would show the S icon. And the left icon battery we named the first battery is the one in battery compartment and the right icon battery we named the second battery is the one in helmet bucket.
  • Page 114 About the color vary of the display V1.0.0...
  • Page 115 About the color vary of the display V1.0.0...
  • Page 116 How to replace Display (Ref: 006) Display 1.Disconnect the battery first then Unscrew three Hexagon flange nuts 2. Disconnect the connector and replace a new one V1.0.0...

  • Page 117: Diagnostic Code

    Diagnostic Code List Priority Fault Code Definition level BCS MOSFET damaged Battery 1 MOS transistor damaged Battery 1 drop in water Battery 1 short-circuit protection warning Battery 1 open circuit or imbalance warning Battery 2 MOS transistor damaged Battery 2 drop in water Battery 2 short-circuit protection warning Battery 2 open circuit or inbalance warning Battery 1 charging over-current protection warning...
  • Page 118 Fast charger power over-voltage protection Fast charger power over-current protection ECU no network or lack credit ECU no SN for recognisation Battery 1 communication fault Battery 2 communication fault FOC controller Communication fault BCS communication fault Main harness issue Remote lock FOC controller verification failed Communication module failure.
  • Page 119 Error codes of batteries and BCS Fault MOSFET Damaged Over-heat protection warning Low-temp protection warning Battery-1 Battery-2 Communication Failure MOSFET Damaged Drop in water Troubleshooting: Use fine related charger and correct batteries to Short Circuit related scooters. protection warning Discharge Temperature: -20°C-70°C Open Circuit or Charge Temperature: 0°C-55°C imbalance warning...
  • Page 120 Error codes of Fast Charger Fault Fast Charger Short-circuit protection Temperature protection Over voltage protection Over current protection Troubleshooting: Please use it in right environment and charge the related batteries. If it still reports error, please replace the charger. V1.0.0...
  • Page 121 Error codes related FOC Controller Fault Fast Charger Motor locked rotor FOC undervoltage or overvoltage FOC over current FOC over temperature Trouble shooting: Please try to re-plug battery and re-plug FOC connector. If it is still error, please replace FOC. FOC power fault FOC verification fail Trouble shooting: Please try to re-plug battery and re plug...
  • Page 122 Diagnostic Code - 10/11/12/13 on display V1.0.0...
  • Page 123 Diagnostic Code - 30 on display V1.0.0...
  • Page 124 Diagnostic Code - 31 on display V1.0.0...
  • Page 125 Diagnostic Code - 32 on display V1.0.0...
  • Page 126 Diagnostic Code - 60/62/63/64/65 on display V1.0.0...
  • Page 127 Diagnostic Code - 67 on display V1.0.0...
  • Page 128 Diagnostic Code - 99 on display V1.0.0...
  • Page 129 Diagnostic Code - 110 on display V1.0.0...
  • Page 130 Diagnostic Code - 111 on display Verification V1.0.0...
  • Page 131 Diagnostic Code - 120 on display V1.0.0...
  • Page 132 Diagnostic Code - 130/131/132/133 on display V1.0.0...
  • Page 133 Diagnostic Code - 140 on display V1.0.0...
  • Page 134 Diagnostic Code - 190 on display V1.0.0...
  • Page 135 Diagnostic Code - 191 on display V1.0.0...

  • Page 136: Regular Maintenance Checklist

    Regular Maintenance Checklist Overview The scooter is set on a flat ground before operating.The scooter is inspected, tested, cleaned, adjusted, lubricated or replaced (if necessary) as per items and maintenance cycles specified in the maintenance schedule. The following items require a certain degree of the mechanical knowledge. Some items may require more technical data and tools.
  • Page 137 Regular Maintenance Checklist Power lock Lighting inspection Instrument inspection Left/Right Combination Electronic Switches Components Alarm and horn EBS energy recovery Controller inspection Wire connection and appearance Inspection for abnormal Wheel-hub motor noise Startup inspection Tolerance and deformation ECU software version FOC software version Software BMS 29Ah setting (60V29Ah...
  • Page 138 Regular Maintenance Checklist Inspection of the Accelerator Handle • Check the accelerator handle for smooth operating. • Check the accelerator handle for smooth opening and automatic resetting at all steering positions of the steering handle. • Check the accelerator handle cable if the accelerator handle can not be reset as usual. Inspection of Brake Pads wearing •...
  • Page 139 Regular Maintenance Checklist Inspection of Brake Lamp Switch and Front/Rear Brake • The brake switch on the brake handle can not be adjusted • Make sure that the brake lamp turns on in actual application of the brake.Replace the front/rear brake switch or other faulty components in the braking system, if turn-on of the front brake switch is not synchronous with brake application nspection of Lamp System and Switches...
  • Page 140 Regular Maintenance Checklist Inspection of Suspension system Front suspension • Operate the front brake and check the front suspension system by pressing down the handle bar for several times to check motion of the fork. • Check the entire assembly for leakage, damages or loosened fasteners. •...
  • Page 141 Regular Maintenance Checklist Nuts, Bolts and Fasteners • Make sure that all nuts and bolts on the chassis have been tightened as per correct torque values. • Make sure that all the split pins, safety clips, hose clamps and wire cables have been placed properly and secured tightly.
  • Page 142 Regular Maintenance Checklist Inspection of Wheels and Tires • Support the scooter with the Central Stands. • Lift up the Front/Rear Wheel to check range of the free travel. • Hold the Front/Rear Wheel and try to move it leftward and rightward to check the front wheel bearing for wearing.
  • Page 143 Regular Maintenance Checklist Steering column bearing • Support the scooter with Central Stands, and lift up the Front Wheel to make it off the ground. • Make sure that scooter handles can be turned freely to left and right sides. •...
  • Page 144 V1.0.0...

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