TCM Inspection [FS5A-EL]

TCM INSPECTION [FS5A-EL]

NOTE:
- The TCM terminal voltage can vary with conditions when measuring and changes due to age deterioration on the vehicle, causing false diagnosis. Therefore a comprehensive inspection of the input and output systems, and the TCM is necessary to determine where the malfunction occurs.

1. Disconnect the negative battery cable.

2. Remove the TCM. TCM Removal/Installation [FS5A-EL]

3. Connect the TCM connector.

4. Connect the negative battery cable.

5. Connect the voltmeter (-) lead to body GND.

6. 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 "Inspection Item" column in the "TCM Terminal Voltage".

TCM Terminal Voltage (Reference)

TCM Terminal Voltage (Reference) (Part 1):

TCM Terminal Voltage (Reference) (Part 2):

TCM Terminal Voltage (Reference) (Part 3):

Input/Output Wave Form (Reference)

Shift solenoid A





- TCM terminals
1A (+)-body GND (-)
- Oscilloscope setting
5 V/DIV (Y), 5 ms/DIV (X), DC range
- Test Condition
D range 4GR

Shift solenoid B





- TCM terminals
1B (+)-body GND (-)
- Oscilloscope setting
5 V/DIV (Y), 5 ms/DIV (X), DC range
- Test Condition
D range 1GR

Shift solenoid C





- TCM terminals
1C (+)-body GND (-)
- Oscilloscope setting
5 V/DIV (Y), 5 ms/DIV (X), DC range
- Test Condition
D range 1GR

Pressure control solenoid B





- TCM terminals
1D (+)-body GND (-)
- Oscilloscope setting
5 V/DIV (Y), 5 ms/DIV (X), DC range
- Test Condition
Shifting from 4GR to 5GR or from 5GR to 4GR

Pressure control solenoid A (+)





- TCM terminals
1E (+)-body GND (-)
- Oscilloscope setting
5 V/DIV (Y), 1 ms/DIV (X), DC range
- Test Condition
The following conditions are met:

- Ignition switch ON (engine off)
- P position
- Accelerator pedal fully depressed

Pressure control solenoid A (-)





- TCM terminals
1G (+)-body GND (-)
- Oscilloscope setting
200 mV/DIV (Y), 1 ms/DIV (X), DC range
- Test Condition
The following conditions are met:

- Ignition switch ON (engine off)
- P position
- Accelerator pedal fully depressed

Input/turbine speed sensor





- TCM terminals
2I (+)-2K (-)
- Oscilloscope setting
1 V/DIV (Y), 2 ms/DIV (X), DC range
- Test Condition
Idle at P position after warm-up

Intermediate sensor





- TCM terminals
2L (+)-body GND (-)
- Oscilloscope setting
1 V/DIV (Y), 2.5 ms/DIV (X), DC range
- Test Condition
Vehicle speed at 30 km/h {19 mph}.

VSS





- TCM terminals
2P (+)-body GND (-)
- Oscilloscope setting
1 V/DIV (Y), 2.5 ms/DIV (X), DC range
- Test Condition
Vehicle speed at 30 km/h {19 mph}.