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AUTOMATIC TRANSMISSION - NAG1
AUTOMATIC TRANSMISSION - NAG1 (Continued)
DIAGNOSIS AND TESTING - AUTOMATIC TRANSMISSION
CONDITION
MAXIMUM SPEED 30 km/h
ENGINE DIES WHEN
TRANSMISSION IS
SHIFTED INTO GEAR,
ALSO NOISES IN N
AND/OR P
LEVER IN P POSITION
BLOCKED (BRAKE
ACTIVATED)
GRUMBLING, DRONING,
JERKING WHEN TCC IS
ENGAGED
HOWLING, HUMMING
ABOVE 4000 RPM IN
EACH GEAR
WHINING, SINGING
CLACK NOISE FROM
CENTER SHIFT AREA
WHEN STOPPING OR
STARTING
CRACKING NOISE WHEN
LOAD CYCLE
CHATTERING IN CENTER
CONSOLE SHIFT WHILE
ACCELERATING
HARD 2-3 UPSHIFT WHEN
STEPPING OFF THE
ACCELERATOR PEDAL
UPSHIFT 2-3, 3-4
SLIPPING
HARD 2-1 DOWNSHIFT
WHEN COMING TO A
STOP
POSSIBLE CAUSES
1. Speed Control 30 Actuated.
1. PWM Valve Blocked.
2. Torque Converter Lock Up Control
Valve Locked.
1. No Vacuum Brake Booster After
Long Immobilization, Brake Pedal
Not Fully Applied/Hard Pedal.
2. No Stoplamp Switch Signal (no
DTC IN ECM).
1. Slip Speed TCC to Low.
1. Oil Filter Blocked.
2. Oil Pump.
1. Gear Set Noises in 1st, 2nd, 5th
Gear.
2. Intermediate Bearing Of The Drive
Shaft At 0 km/h, Only When Cold.
1. Park Lock Solenoid.
1. Stick - Slip Between Joint Flange
and Collar Nut.
1. Bushing Shift Shaft Has Too Much
Clearance.
1. Response Characteristic Control
Loop.
1. Spring of Regulating Valve
Pressure control Valve Broken.
1. Transmission (2-1 downshift) Not
Adapted.
2. TCM Software Data.
3. Free Wheeling Clutch F1
Defective.
CORRECTION
1. Instruct Customer.
1. Replace Valve.
2. Enable Movement of Valve,
Remove Particle.
1. Check Vacuum/ Tightness of
Brake Booster.
2. Check Contact to Stoplamp
Switch. Replace Switch if
Necessary.
1. Switch Off Torque Converter
Lock Up Using DRB . If
Complaint Is Not Reproduced
Afterwards, Replace PWM
Valve, Set Adaption Values to
Zero.
1. Replace Oil Filter.
2. Replace Oil Pump.
1. Replace Transmission..
2. Replace Intermediate
Bearing of the Drive Shaft.
1. Replace Shift Lever
Assembly.
1. Install Zinc Coated Collar Nut
Together With Washer.
1. Replace Shifter Lever and
Cover Plate.
1. Install K2 Disc Spring.
1. Replace Spring.
1. Re-adapt Transmission.
2. Flash TCM.
Replace Free Wheeling Clutch
F1.
VA
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