P2253

DTC P2253: Heated Oxygen Sensor Offset Circuit High Voltage

TECHNICAL DESCRIPTION
- The ECM applies an offset voltage of 0.5 volt to the heated oxygen sensor
- The ECM checks for heated oxygen sensor offset voltage.

DESCRIPTIONS OF MONITOR METHODS
Heated oxygen sensor offset voltage is over specified range.

MONITOR EXECUTION
Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
- Not applicable

Sensor (The sensor below is determined to be normal)
- Not applicable

DTC SET CONDITION

Logic Flow Chart

Logic Flow Chart:

Check Condition
- 2 seconds or more have passed since the engine starting sequence was completed.

Judgement Criterion
- Heated oxygen sensor offset voltage has continued to be 0.6 volt or higher for 2 seconds.

FAIL-SAFE AND BACKUP FUNCTION
- Does not control air-fuel ratio closed loop.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnosis Function - OBD-II Drive Cycle - Pattern 23. OBD- II Drive Cycle

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- 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. Test the OBD-II drive cycle.







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. Carry out the test drive with the drive cycle pattern. Refer to Diagnostic Function OBD-II Drive Cycle - Pattern 23. OBD- II Drive Cycle
4. Check the diagnostic trouble code (DTC).

Q: Is DTC P2253 set?

YES : Replace the ECM. When the ECM is replaced, register the ID code.

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