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7A2-108 DIAGNOSIS
No. B10: Brake is Applied in R Range • Brake is applied suddenly in R range. • Basically a trouble in the AT main unit. However, some trouble in the sensor system or output system may have some influence on the trouble in the main unit and therefore these systems should be also checked to prevent reproduce of the trouble. • Seized clutch (low clutch, high clutch, 2-4 brake). • Shortage or faulty quality of ATF. • Trouble in control valve body (faulty operation, sticking, clogged oil passage). • Disordered select cable (select indicator light indicates R but the hydraulic system is not in the R range). • Malfunction of parking mechanism. No. B11: Insufficient Starting or Shaking in D Range • Insufficient starting or shaking in D range. • Slip of clutch (low clutch, low one-way clutch, reverse clutch, low & reverse brake).
If slip of clutch is caused, a DTC (gear ratio error) is stored. • Shortage or faulty quality of ATF. • Dropped line pressure. • Trouble in control valve body (faulty operation, sticking, clogged oil passage). No. B12: Noise or Vibration is Generated at Starting • Noise or vibration is generated in the vicinity of AT at starting. • 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.
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