Code No. P1232: Fail-safe Control System


FUNCTION



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

TROUBLE JUDGMENT


Check Condition
  • Ignition switch is "ON" position.
Judgement Criterion
  • Power supply to the throttle valve control servo cannot be shut down (though power supply is stopped).
FAIL-SAFE AND BACKUP FUNCTION
  • Microcomputer is reset.

PROBABLE CAUSES



  • Failed throttle valve control servo relay circuit
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.

Q. Is diagnosis code set?
Go to Step 2.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 2. M.U.T.-III diagnosis code

Q. Is diagnosis code of P0657 set?
Check throttle valve control servo power system (Refer to Code No. P0657: Throttle Valve Control Servo Relay Circuit Malfunction ).
Replace the engine-ECU.