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 1O and 1P 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

• 2L(+)-1O(-)

• 1 V/DIV (Y), 2.5 ms/DIV (X), DC range

• Drive the vehicle at approx. 32 km/h {19.9 mph}

VSS signal (input)

• 2P (+)-1O (-)

• 1 V/DIV (Y), 2.5 ms/DIV (X), DC range

• Drive the vehicle at approx. 32 km/h {19.9 mph}

Vehicle speed signal (output)

• 1L (+)-1O (-)

• 1 V/DIV (Y), 5 ms/DIV (X), DC range

• Drive the vehicle at approx. 30 km/h {18.6 mph}

Input/turbine speed sensor signal

• 2I (+)-1O (-)

• 500 mV/DIV (Y), 1 ms/DIV (X), DC range

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

Pressure control solenoid A signal

(-)

• 1G(+)-1P(-)

• 200 mV/DIV (Y), 1 ms/DIV (X), DC range

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

(+)

• 1E(+)-1P(-)

• 5 V/DIV (Y), 1 ms/DIV (X), DC range

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

Pressure control solenoid B signal

• 1D(+)-1P(-)

• 5 V/DIV (Y), 5 ms/DIV (X), DC range

• 4GR→5GR, 5GR→4GR

Shift solenoid A control

• 1A(+)-1P(-)

• 5 V/DIV (Y), 5 ms/DIV (X), DC range

• 4GR (D range)

Shift solenoid B control

• 1B(+)-1P(-)

• 5 V/DIV (Y), 5 ms/DIV (X), DC range

• 1GR (D range)

Shift solenoid C control

• 1C(+)-1P(-)

• 5 V/DIV (Y), 5 ms/DIV (X), DC range

• 1GR or 2GR