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7A2-132 DIAGNOSIS
No. F2: Engine Races Up During Acceleration (Slip) • The engine speed up when the accelerator pedal is stepped on for acceleration and the gear is shifted up or down. • Only the engine speeds up but vehicle speed does not increase when the accelerator pedal is stepped on for acceleration during the running. • Basically same causes as "No. C1 - C8: Engine races up (slip) by shift up or shift down" are considered. When the condition of No. C1-C8 grows worse, symptom of No. F2 results. No. F3: Noise or Vibration During the Running in R, D, 3, 2 or L Range • Noise or vibration is generated in the vicinity of AT during the running. • Cause other than AT can be also considered. It is effective means to reproduce a running condition using a lift up, chassis dynamo, etc. to investigate the origin (generating condition) of noise and vibration.
Caution:
Lifting up some unit to test it accompanies danger. Provide safety measures as far as possible and carry out the test with sufficient care.
Following sources of noise or vibration other than the AT can be considered. • Noise from differential gears. • Noise from propeller shaft. • The bearing support in the middle of the propeller shaft has fatigued, and the bend angle of the propeller shaft has changed, causing vibration at the time of start. • Unbalanced and poor uniformity of tires cause vibration. No. F4: Engine Brake Does Not Apply in L Range • The engine brake does not apply, allowing the vehicle to run freely when the accelerator pedal is released at low speed in L range. • Slip of clutch (low & reverse brake)
If slip of clutch is caused, a DTC (gear ratio error) is stored. • Faulty input/output signal system. Low & reverse brake duty solenoid • Faulty control valve (faulty operation, sticking).
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