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Related Manuals for SAIC MOTOR MG4 EV
Summary of Contents for SAIC MOTOR MG4 EV
- Page 1 MG4 EV Guided Fault Finding - General...
- Page 2 Contents General Information ......1 Strategy Based Diagnostics ........1 Description on Diagnostic Procedure....1 Diagnostic System Check - Vehicle...... 3 Basic Methods of Circuit Inspection ....4 Diagnosis Repair Verification....... 9 Vibration .............. 10 Vibration Analysis..........10 Diagnostic Aid for Vibration ......12 Noise..............
- Page 3 General Information Strategy Based Diagnostics Strategy Based Diagnostics Description on Diagnostic Procedure 1. Understand and confirm the problem reported by the 4. Perform a diagnostic system check - vehicle, confirm if customer: The first step of this procedure is to know as the system works normally.
- Page 4 General Information Strategy Based Diagnostics failure, electromagnetic/radio frequency interference, driving condition or aftermarket add-on equipments. 7. Find out the root cause of the failure, then make repair and verify the result: after finding out the root cause of the failure, repair it and verify if the problem is solved in a proper way.
- Page 5 General Information Strategy Based Diagnostics Diagnostic System Check - Vehicle Perform the diagnostic procedure in this manual on condition that all functions below conform to the design conventions • 12 V battery is fully charged and the cable is clean and secure.
- Page 6 General Information Strategy Based Diagnostics Basic Methods of Circuit Inspection Measurement of Frequency The basic methods of circuit inspection include the following Use an oscilloscope or other special frequency meters to basic inspection information. This information is used with measure the frequency. Only the measurement method using the diagnostic procedures to identify the causes for electrical a digital multimeter will be described below.
- Page 7 General Information Strategy Based Diagnostics • The accessory power is OFF (Open and close the driver If the digital multimeter shows a voltage when the first door after the start switch is turned off) connector or switch is connected, the circuit to the first connector or switch is short-circuited.
- Page 8 General Information Strategy Based Diagnostics It may be necessary to load the vehicle to reproduce the • Positive and negative terminals of the connector are in failure. This may require heavy objects, floor jack, jack stand, poor contact or not. lift, etc.
- Page 9 General Information Strategy Based Diagnostics due to contamination or deformation. Improper intermediate connections between the power supply and connection of connectors may cause contamination. the module/component. Test lamp or digital multimeter Missed or damaged connector seal, damaged connector or can display the presence of voltage, but cannot be used to exposure of terminals in moisture or dust may also cause test if the circuit can transmit sufficient current.
- Page 10 General Information Strategy Based Diagnostics motor, alternator, etc.) - such components will induce electrical noise in the circuit and interfere its normal operation. • Electrical system interference caused by the failure of relay, solenoid valve driven by control module or switch - all these may result in strong surge.
- Page 11 General Information Strategy Based Diagnostics Diagnosis Repair Verification 1. Fit all components or connectors removed or replaced during diagnosis. 2. Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced. 3. Clear the DTC. 4.
- Page 12 General Information Vibration Vibration engine, transmission, etc.), vibration transmitter (consisting of suspension system and connector) and noise emitters (body). Vibration Analysis Vehicle noise sources mainly include: engine, exhaust system, Noise and Vibration from Vehicle wind noise, tyre noise and any other moving parts possibly Mechanical vibration is usually accompanied by noise and making noise.
- Page 13 General Information Vibration Typical Type Description Frequency Occurrence Conditions Key Parts Range Usually heard as an interior Vehicle Speed Sensitive noise similar to the noise of a Still occurs during coast down Tyres and Wheels bowling ball rolling down an in NEUTRAL alley, deep thunder, or a bass drum...
- Page 14 General Information Vibration Diagnostic Aid for Vibration • Belt flapping - Flapping occurs once the performance of the engine accessory drive belt is degraded and impurities Vibration reproduced intermittently or cannot be accumulate at the underside of the belt. reproduced •...
- Page 15 General Information Vibration Vibration reproduced, but the faulty component cannot be identified After-sales accessories If after-sales accessories are fitted incorrectly, they may transmit and amplify the inherent rotational frequency of rotating parts. Vibration isolation methods should be used when fitting accessories to prevent them becoming a path to transmit vibration to other parts of the vehicle.
- Page 16 General Information Noise Noise • Cracked weatherstrips Air/Wind Noise • Broken welding points To analyze a reported wind noise condition, test the driving • Neglected sealant and/or adhesive vehicle to determine the origin of the noise. Drive on normal flat straight road along four directions respectively: north, south, east and west.
- Page 17 General Information Noise Squeak and Click Use proper chassis ear or leak detector for auxiliary diagnosis. • Attach the component that squeaks or clicks securely. • Separate the components that squeak or click to prevent contact. • Insulate the components that squeak or click. •...
- Page 18 General Information Waterleaks Waterleaks 6. Pipe to Hose Nipple, Right Stand Only 7. Female Hose Coupling Water Leak Test Preparation 8. Input Hose, Right Stand Only • This vehicle is designed to operate under normal environmental conditions. 9. Close Nipple •...
- Page 19 General Information Waterleaks 6. In order to check the side windows for leaks, position the water spray test stand towards the centre of the rear quarter, aiming the water spray 30 degrees down and 45 degrees toward the rear. 7. In order to check the rear window, aim the water spray 30 degrees down and 30 degrees toward the front.
- Page 20 General Information Information on Precautions Information on Precautions • Do not use petrol/gasoline, kerosene, diesel fuel, oil, thinners or solvents for cleaning skin. General Precautions • Where practicable, degrease components prior to Dangerous Substances handling. Modern vehicles contain many materials or liquids which if not •...
- Page 21 General Information Information on Precautions Safety Instructions Jacking Always use the recommended jacking points. Always ensure that any lifting apparatus has sufficient load capacity for the weight to be lifted. Ensure the vehicle is standing on level ground prior to lifting or jacking.
- Page 22 General Information Information on Precautions Environmental Precautions every precaution must be taken to prevent spillage reaching the drains. Overview Handling of such materials must take place well away from the This section provides general information which can help to drains and preferably in an area with a kerb or wall around it, to reduce the environmental impacts from the activities carried prevent discharge into the drain.
- Page 23 General Information Information on Precautions Be sensitive to the time of day when these activities are carried • Small parts: reuse any suitable parts, dispose of the out and minimise the time of the noisy operation, particularly remainder in ordinary waste. in the early morning and late evening.
- Page 24 General Information Information on Precautions Fuel Handling Precautions When body repairs involve the use of heat, all fuel pipes which run in the vicinity of the repair area must be removed, and the Overview tank outlet plugged. Fuel vapour is highly flammable and in confined spaces is also explosive and toxic.
- Page 25 General Information Information on Precautions Electrical Precautions Battery Disconnection Before disconnecting the battery, disable the alarm system and Overview switch off all electrical equipment. The following guidelines are intended to ensure the safety of Battery Charging the operator while preventing damage to the electrical and electronic components fitted to the vehicle.
- Page 26 General Information Information on Precautions Supplementary Restraint System Precautions • Ensure the SRS ECU is always fitted correctly. There must not be any gap between the SRS ECU and the bracket to General Precautions which it is mounted. An incorrectly mounted SRS ECU The SRS system contains components which could be could cause the system to malfunction.
- Page 27 General Information Information on Precautions • Do not unlock and rotate the rotary coupler when it is removed from the vehicle. • Do not turn the wheels when the rotary coupler is removed from the vehicle. • Always ensure the rotary coupler is removed and fitted in its centre position and with the front wheels in the straight ahead position - refer to the SRS repair section for the correct removal and installation procedure.
- Page 28 General Information Information on Precautions Air Conditioning System Precautions components and panels may transmit noise and so must be eliminated. Overview • The appropriate torque wrench must be used when The air conditioning system contains fluids and components tightening refrigerant connections to the stipulated value. which could be potentially hazardous to the service engineer An additional spanner must be used to hold the union to or the environment if not serviced and handled correctly.
- Page 29 General Information Information on Precautions rapidly. The rapid discharge of refrigerant will also result in the loss of most of the oil from the system. While removing the compressor, drain the remaining oil, and service as instructed in the air conditioning section of this manual. Precautions for Refrigerant Recovery, Recycling and Recharging When the air conditioning system is recharged, any existing...
- Page 30 General Information Information on Precautions ： ： ： Precautions for High Voltage Warning Prior to opening any high voltage circuits the systems MUST be checked using a suitable multi Basic Requirements meter to ensure they carry no high voltage current. Attention: Do not operate or unplug MSD unless necessary.
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