Control Module: Testing and Inspection

PCM INSPECTION [FN4A-EL]

CAUTION:
- Water or foreign objects entering the connector can cause a poor connection or corrosion. Be sure not to drop water or foreign objects on the connector when disconnecting it.

NOTE:
- The PCM 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 PCM is necessary to determine where the malfunction occurs.

1. Remove the PCM connector cover. PCM Removal/Installation

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

3. 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 "PCM Terminal Voltage".

PCM Terminal Voltage (Reference)

NOTE:
- Only the transaxle-related information is described.













Input/Output Wave From (Reference)

Shift solenoid A





PCM terminals
- 1D (+)-Negative battery terminal (-)

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

Vehicle condition
- D position O/D

Shift solenoid B





PCM terminals
- 1H (+)-Negative battery terminal (-)

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

Vehicle condition
- D position 1GR

Shift solenoid C





PCM terminals
- 1L (+)-Negative battery terminal (-)

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

Vehicle condition
- D position 1GR

Pressure control solenoid (+)





PCM terminals
- 1P (+)-Negative battery terminal (-)

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

Vehicle condition
- Idle at P position after warm-up

Pressure control solenoid (-)





PCM terminals
- 1T (+)-Negative battery terminal (-)

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

Vehicle condition
- Idle at P position after warm-up

Input/turbine speed sensor





PCM terminals
- 1R (+)-1V (-)

Oscilloscope setting
- 1 V/DIV (Y), 2 ms/DIV (X), DC range

Vehicle condition
- Idle at P position after warm-up

VSS





PCM terminals
- 1AX (+)-Negative battery terminal (-)

Oscilloscope setting
- 1 V/DIV (Y), 2 ms/DIV (X), DC range

Vehicle condition
- The following conditions are met:

- Vehicle speed: 30 km/h {19 mph}
- Gear position: 3GR