P1232

DTC P1232: Fail Safe System

TECHNICAL DESCRIPTION
- To judge whether fail-safe control can be performed, check that power supply to the throttle actuator control motor circuit can be stopped by turning the throttle actuator control motor relay to OFF position momentarily.

DTC SET CONDITIONS

Check Condition
- Ignition switch is "ON" position.

Judgment Criterion
- Power supply to the throttle actuator control motor cannot be shut down (though power supply is stopped).

FAIL-SAFE AND BACKUP FUNCTION
- Microcomputer is reset.

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- Throttle actuator control motor relay circuit failed.
- ECM failed.

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A

STEP 1. Using scan tool MB991958, read the diagnostic trouble code (DTC).







CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Read the DTC.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: is the DTC P1232 set?

YES : Go to Step 2.

NO : It can be assumed that this malfunction is intermittent.

STEP 2. Using scan tool MB991958, read the diagnostic trouble code (DTC).

1. Turn the ignition switch to the "ON" position.
2. After the DTC has been deleted, read the DTC again.
3. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is DTC P0657 set?

YES : Refer to DTC P0657 -Throttle actuator control motor relay circuit malfunction. P0657

NO : Replace the ECM. When the ECM is replaced, register the ID code.