Code No. P1242: Fail-safe Control Monitoring
FUNCTION
Monitors the engine speed during fail-safe control.
TROUBLE JUDGEMENT
Check Condition
During fail-safe control.
Judgement Criterion
The engine speed is higher than assumed.
FAIL-SAFE AND BACKUP FUNCTION
Throttle opening degree position is in default position.
PROBABLE CAUSE
Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q. Is any other diagnosis code than P1242 set?
Inspection chart for diagnosis code (Refer to
).
Go to Step 2.
STEP 2. M.U.T.-III diagnosis code
Reconfirmation of diagnosis code.
Q. Is diagnosis code set?
Replace the engine-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions
).