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Content .. 1878 1879 1880 1881 ..
7A2-136 DIAGNOSIS
No. I1: No Lock-up • Lockup is not performed in spite of the lock-up area. • Lockup is not performed in spite of the lock-up area. • Monitor the signal to the lock-up solenoid while carrying out a running test. • When the output signal to the lock-up solenoid is correctly sent causing no lock-up, clogged lock-up solenoid oil passage or malfunction of the lock-up piston may be considered. • Even the lock-up area, the output signal to the lock-up solenoid is not sent, fault of the ATF thermo sensor controlling the lockup is considered. (Lock-up is not operated at ATF temperature less than 11 °C or more than 128 ° C.)
Note:
When the lock-up piston has burnt, foreign material mixed in the oil cooler is considered. In such a case, inspect the oil cooler circuit for clogging of the oil cooler • ATF thermo sensor detects low oil temperature (Lock-up is prohibited temperature less than 10 ° C.). • Clogged oil passage of lock-up duty solenoid. • Trouble in control valve body (faulty operation, sticking, clogged oil passage).
Step Action Yes No 1 Are any DTCs stored? Go to DTC Chart Go to Step 2 2 Are the quantity, contamination and smell normal?
If the ATF level is low, replenish up to the specified level.
Go to Step 3
If ATF is extremely black and contaminated and smells burnt, slip of the clutch is supposed. Overhaul the AT unit. |