Component Tests and General Diagnostics
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. Connect the voltmeter (-) lead to body GND.
2. 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 From (Reference)
Shift solenoid A
- TCM terminals
AG (+)-body GND (-)
- Oscilloscope setting
5 V/DIV (Y), 5 ms/DIV (X), DC range
- Test Condition
D range 4GR
Shift solenoid B
- TCM terminals
AJ (+)-body GND (-)
- Oscilloscope setting
5 V/DIV (Y), 5 ms/DIV (X), DC range
- Test Condition
D range 1GR
Shift solenoid C
- TCM terminals
AL (+)-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
AM (+)-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
AD (+)-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
AE (+)-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
AB (+)-Y (-)
- 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
AC (+)-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
Z (+)-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}.