Code No. P2253: Oxygen Sensor Offset Circuit High Voltage
FUNCTION
The engine-ECU watches and checks whether the offset voltage of the oxygen sensor is normal or not.
TROUBLE JUDGEMENT
Check Condition
More than 2 seconds have passed since the engine starting sequence was completed.
Judgement Criterion
Oxygen sensor offset voltage is more than 0.6 V for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
Does not control air-fuel ratio closed loop.
PROBABLE CAUSE
Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. 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
).