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DTC P2252-00: Oxygen Sensor offset circuit low voltage
 
 
 
 
CIRCUIT OPERATION
  • The sensor signal is inputted to the ECM connector terminal number 49 from the heated oxygen sensor (rear) connector terminal number 4.
  • The heated oxygen sensor (rear) connector terminal number 3 is grounded with ECM connector terminal number 50.
  • The ECM connector terminal number 50 applies an offset voltage of 0.5 volt to the heated oxygen sensor (rear) connector terminal number 3.
 
 
TECHNICAL DESCRIPTION
  • The ECM applies an offset voltage of 0.5 volt to the heated oxygen sensor (rear).
  • The ECM checks for heated oxygen sensor (rear) offset voltage.
 
 
DESCRIPTIONS OF MONITOR METHODS
Heated oxygen sensor (rear) offset voltage is under specified range.
 
 
MONITOR EXECUTION
Continuous.
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set 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
Check Condition
  • More than 2 seconds have passed since the power supply mode of the electric motor switch was ON.
Judgment Criterion
  • Heated oxygen sensor (rear) offset voltage is lower than 0.4 volt for 2 seconds.
 
 
FAIL-SAFE AND BACKUP FUNCTION
None.
 
 
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function, OBD-II Drive Cycle – Pattern 1 OBD- II DRIVE CYCLE.
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • Heated oxygen sensor (rear) failed.
  • Shorted heated oxygen sensor (rear) circuit or connector damage.
  • ECM failed.
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
1.STEP 1. Check heated oxygen sensor (rear) itself.
Check heated oxygen sensor (rear) itself (Refer to HEATED OXYGEN SENSOR CHECK).
Q: Is the check result normal?
Replace the heated oxygen sensor (rear) (Refer to ENGINE, Engine, Motor and Emission Control – Emission Control – Exhaust Gas Purification System CATALYTIC CONVERTER REMOVAL AND INSTALLATION).
 
2.STEP 2. Perform voltage measurement at heated oxygen sensor (rear) connector terminal number 3.
(1) Disconnect connector, and measure at harness side.
(2) Power supply mode of electric motor switch: ON
(3) Voltage between heated oxygen sensor (rear) connector terminal number 3 and ground.
OK: 0.4 to 0.6 volt.
Q: Is the check result normal?
 
3.STEP 3. Check harness between heated oxygen sensor (rear) connector terminal number 3 and ECM connector terminal number 50.
Check ground line for short circuit to ground.
Q: Is the check result normal?
Repair or replace the connector, or repair the damaged harness wire.
 
4.STEP 4. Test the OBD-II drive cycle.
After erasing the DTC, carry out test drive with the drive cycle pattern, and recheck the DTC.
(1) Use scan tool (M.U.T.-III SE) to erase the DTC.
(2) Carry out test drive with the drive cycle pattern (Refer to Diagnostic Function, OBD-II Drive Cycle – Pattern 1 OBD- II DRIVE CYCLE).
(3) Use scan tool (M.U.T.-III SE) to recheck the DTC.
Q: Is DTC P2252-00 set?
Replace the ECM (Refer to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION).
Intermittent malfunction (Refer to GENERAL INFORMATION, General Information – How to Use Troubleshooting/Inspection Service Points – How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).