Automatic Transmission/Transaxle [FS5A-El]

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.














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 (20 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 (20 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