TCM Inspection

TCM INSPECTION [FS5A-EL]

CAUTION:
- The TCM terminal voltages vary with changes in measuring and vehicle conditions. Always carry out a total inspection of the input and output systems, and the TCM to determine the cause of trouble. Otherwise, a mis-diagnosis could occur.

1. Measure the voltage at each terminal.

- If any incorrect voltage is detected, inspect the related system(s), wiring harnesses and connector(s) referring to the Action column in the terminal voltage table.

Terminal Voltage Table (Reference)

NOTE:
- Use the ground of terminal L and M of the TCM when measuring terminal voltage, as an error may occur when connecting the negative circuit tester to ground.

Terminal Voltage Table (Reference) (Part 1):

Terminal Voltage Table (Reference) (Part 2):

Terminal Voltage Table (Reference) (Part 3):

Terminal Voltage Table (Reference) (Part 4):

Inspection Using an Oscilloscope (Reference)

Secondary gear rotating speed signal





TCM terminals
- AC (+)-M (-)

Oscilloscope setting
- 1 V/DIV (Y), 2.5 ms/DIV (X), DC range

Vehicle condition
- Drive the vehicle at approx. 32 km/h {19.9 mph}

VSS signal





TCM terminals
- Z (+)-M (-)

Oscilloscope setting
- 1 V/DIV (Y), 2.5 ms/DIV (X), DC range

Vehicle condition
- Drive the vehicle at approx. 32 km/h {19.9 mph}

Input/turbine speed sensor signal





TCM terminals
- AB (+)-M (-)

Oscilloscope setting
- 500 mV/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (engine speed approx. 700 rpm, no load, P/S off, A/C off)

Pressure control solenoid A signal

(-)






TCM terminals
- AE (+)-M (-)

Oscilloscope setting
- 200 mV/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (engine speed approx. 700 rpm, no load, P/S off, A/C off)
(+)






TCM terminals
- AD (+)-M (-)

Oscilloscope setting
- 5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (engine speed approx. 700 rpm, no load, P/S off, A/C off)

Pressure control solenoid B signal





TCM terminals
- AM (+)-M (-)

Oscilloscope setting
- 5 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition
- 4GR->5GR, 5GR->4GR

Shift solenoid A control





TCM terminals
- AG (+)-M (-)

Oscilloscope setting
- 5 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition
- 4GR (D range)

Shift solenoid B control





TCM terminals
- AJ (+)-M (-)

Oscilloscope setting
- 5 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition
- 1GR (D range)

Shift solenoid C control





TCM terminals
- AL (+)-M (-)

Oscilloscope setting
- 5 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition
- 1GR or 2GR