7A-40 AUTOMATIC TRANSMISSION (AW30-40LE)
Circuit Description:
The lock-up duty solenoid S3 of the torque converter
clutch (TCC) controls the lock-up clutch by a signal
according to the lock-up range judgement of the TCM
when the vehicle runs.
This function can improve the fuel consumption to
almost the same extent as the manual transmission.
The lock-up solenoid S3 is put into B+ by the TCM, so
that the solenoid is actuated with the result of lock-up.
Test Description:
The following numbers correspond to the step numbers
on the diagnostic chart.
1. When the key is ON, the voltage between the TCM
connector terminal (11) and ground terminal (24) is
1 V or less.
2. When the gear is of the 2nd speed in the D range
and the throttle opening is about 15% or more at a
higher speed than about 54 km/h (UBS), 27 km/h
(TF), the TCM supplies 8 to 16 V, so that the
solenoid is actuated with the result of lock-up.
3. 5. 7. 8. The resistance range of the solenoid is 11 to
15 Ω (20 ℃).
Diagnostic Aids:
In case of faulty connection , open or shorted circuit to
the TCM terminal (11), code 33 is displayed.
A intermittent failure may be caused by a poor
connection, rubbed through wire insulation or a wire
broken inside the insulation.