P1168

On Board Diagnosis Logic
* The closed loop control has the one trip detection logic.
Malfunction is detected when the closed loop control function for right bank does not operate even when vehicle is driving in the specified condition, the closed loop control function for left bank does not operate even when vehicle is driving in the specified condition.

Possible Cause
- The front heated oxygen sensor circuit is open or shorted.
- Front heated oxygen sensor
- Front heated oxygen sensor heater

DTC Confirmation Procedure

CAUTION: Always drive vehicle at a safe speed.

NOTE: If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 10 seconds before conducting the next test.

TESTING CONDITION:
- Never raise engine speed above 3,600 rpm during the "DTC Confirmation Procedure". If the engine speed limit is exceeded, retry the procedure from step 2.
- Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.




WITH CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select "DATA MONITOR" mode with CONSULT-II.
3. Hold engine speed at 2,000 rpm and check one of the following.
- "FR O2 SEN-B1 (-B2)" voltage should go above 0.70 V at least once.
- "FR O2 SEN-B1 (-B2)" voltage should go below 0.21 V at least once.
If the check result is NG, perform "Diagnosis Procedure".
If the check result is OK, perform the following step.
4. Let engine idle at least 5 minutes.
5. Maintain the following condition at least 50 consecutive seconds.

B/FUEL SCHDL 3 msec or more
CKPS.RPM (POS) 1,800 - 3,000 rpm
Selector lever Suitable position
VHCL SPEED SE More than 70 KPH (43 MPH)

During this test, P0130 and/or P0150 may be displayed on CONSULT-II screen.

6. If DTC is detected, go to "Diagnostic Procedure" below.

Overall Function Check
Use this procedure to check the overall function of the closed loop control. During this check, a DTC might not be confirmed.




WITH GST
1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes between ECM terminal 63 (Front heated oxygen sensor right bank signal) or 62 (Front heated oxygen sensor left bank signal) and engine ground.
3. Check the following with engine speed held at 2,000 rpm constant under no-load.
- The voltage should go above 0.70 V at least once.
- The voltage should go below 0.21 V at least once.
4. If NG, go to "Diagnostic Procedure" below.

Diagnostic Procedure
Perform trouble diagnosis for "DTC P0133, P0153".