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DTC P2253: Heated Oxygen Sensor Offset Circuit High Voltage
 
 
 
 
HEATED OXYGEN SENSOR OFFSET CIRCUIT HIGH VOLTAGE CIRCUIT
Refer to DTC P0137 - Heated Oxygen Sensor Circuit Low Voltage (bank 1, sensor 2) .
Refer to DTC P0157 - Heated Oxygen Sensor Circuit Low Voltage (bank 2, sensor 2) .
 
 
CIRCUIT OPERATION
Refer to DTC P0137 - Heated Oxygen Sensor Circuit Low Voltage (bank 1, sensor 2) .
Refer to DTC P0157 - Heated Oxygen Sensor Circuit Low Voltage (bank 2, sensor 2) .
 
 
 
 
TECHNICAL DESCRIPTION
  • The ECM applies an offset voltage of 0.5 volt to the heated oxygen sensor.
  • The ECM check for heated oxygen sensor offset voltage.
 
 
DESCRIPTIONS OF MONITOR METHODS
  • Heated oxygen sensor offset voltage is under 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 CONDITIONS
Logic Flow Chart
 
 
Check Condition
  • 2 seconds or more have passed since the engine starting sequence was completed.
Judgment Criterion
  • Heated oxygen sensor offset voltage is higher than 0.6 volt 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 22 .
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be stored are: )
  • Right bank heated oxygen sensor (rear) failed.
  • Left bank heated oxygen sensor (rear) failed.
  • Shorted right bank heated oxygen sensor (rear) circuit or connector damage.
  • Shorted left bank 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
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)
    • MB991824: Vehicles Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
  • MB991316: Test Harness
  • MD998464: Test Harness
STEP 1. Check the right bank heated oxygen sensor (rear).
(1) Disconnect the right bank heated oxygen sensor (rear) connector and connect test harness special tool MD998464 to the connector on the right bank heated oxygen sensor (rear) side.
(2) Warm up the engine until engine coolant temperature reaches 80°C (176°F) or higher.
(3) Drive at 50 km/h (31 mph) or more for 10 minutes.
(4) Connect a digital voltage meter between terminal ORRE line (black clip) and terminal O2RR line (white clip).
(5) Measure the output voltage of heated oxygen sensor under the following driving.
  • Transaxle: 2nd speed
  • Drive with wide open throttle
  • Engine: 3,500 r/min or more
Standard value: 0.6 - 1.0 V
noteIf the temperature of sensing area does not reach the high temperature [of approximately 400°C (752°F) or more] even though the heated oxygen sensor is normal, the output voltage would be possibly low in spite of the rich air-fuel ratio.
noteWhen the vehicle is driven with high loads, the temperature of the sensing area of the heated oxygen sensor is sufficiently high. Thus, it is not necessary to apply the voltage to the heater.
Is the measured voltage between 0.6 and 1.0 volt?
Go to Step 2.
Replace the right bank heated oxygen sensor (rear). Then go to Step 10.
 
STEP 2. Check the left bank heated oxygen sensor (rear).
(1) Disconnect the left bank heated oxygen sensor (rear) connector B-13 and connect test harness special tool MB991316 to the connector on the left bank heated oxygen sensor (rear) side.
(2) Warm up the engine until engine coolant temperature reaches 80°C (176°F) or higher.
(3) Drive at 50 km/h (31 mph) or more for 10 minutes.
(4) Connect a digital voltage meter between terminal ORLE line (black clip) and terminal O2RL line (white clip).
(5) Measure the output voltage of heated oxygen sensor under the following driving.
  • Transaxle: 2nd speed
  • Drive with wide open throttle
  • Engine: 3,500 r/min or more
Standard value: 0.6 - 1.0 V
noteIf the temperature of sensing area does not reach the high temperature [of approximately 400°C (752°F) or more] even though the heated oxygen sensor is normal, the output voltage would be possibly low in spite of the rich air-fuel ratio.
noteWhen the vehicle is driven with high loads, the temperature of the sensing area of the heated oxygen sensor is sufficiently high. Thus, it is not necessary to apply the voltage to the heater.
Is the measured voltage between 0.6 and 1.0 volt?
Go to Step 3.
Replace the left bank heated oxygen sensor (rear). Then go to Step 10.
 
STEP 3. Measure the sensor offset voltage at ECM connector by using power plant ECU check harness special tool MB992110.
(1) Disconnect all ECM connectors. Connect the power plant ECU check harness special tool MB992110 between the separated connectors.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal ORRE and ground.
  • Voltage should be between 0.4 and 0.6 volt.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage between 0.4 and 0.6 volt?
Go to Step 6.
Go to Step 4.
 
STEP 4. Check of short circuit to power supply in ORRE line between right bank heated oxygen sensor (rear) connector and ECM connector.
Is the harness wire in good condition?
Go to Step 5.
Repair the connector(s) or wiring harness. Then go to Step 10.
 
STEP 5. Check of short circuit to power supply in O2RR line between right bank heated oxygen sensor (rear) connector and ECM connector.
Is the harness wire in good condition?
Go to Step 9.
Repair the connector(s) or wiring harness. Then go to Step 10.
 
STEP 6. Measure the sensor offset voltage at ECM connector by using power plant ECU check harness special tool MB992110.
(1) Disconnect all ECM connectors. Connect the power plant ECU check harness special tool MB992110 between the separated connectors.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal ORLE and ground.
  • Voltage should be between 0.4 and 0.6 volt.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage between 0.4 and 0.6 volt?
Go to Step 9.
Go to Step 7.
 
STEP 7. Check of short circuit to power supply in ORLE line between left bank heated oxygen sensor (rear) connector and ECM connector.
Is the harness wire in good condition?
Go to Step 8.
Repair the connector(s) or wiring harness. Then go to Step 10.
 
STEP 8. Check of short circuit to power supply in O2RL line between left bank heated oxygen sensor (rear) connector and ECM connector.
Is the harness wire in good condition?
Go to Step 9.
Repair the connector(s) or wiring harness. Then go to Step 10.
 
STEP 9. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle Pattern 22 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P2253 stored?
Replace the ECM (Refer to, Removal and Installation ). Then go to Step 10.
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/ Inspection Service Points - How to Cope with Intermittent Malfunctions .
 
STEP 10. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle Pattern 22 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P2253 stored?
Retry the troubleshooting.
The inspection is complete.