P1168
DTC P1168 CLOSED LOOP CONTROLOn Board Diagnosis Logic:
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 5 seconds before conducting the next test.
TESTING CONDITION:
- Never raise engine speed above 2,800 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 11V 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.
- HO2S1 (B1)/(B2) voltage should go above 0.70V at least once.
- HO2S1 (B1)/(B2) voltage should go below 0.21V at least once.
If the check result is NG, perform "Diagnostic Procedure" below.
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.
During this test, P0134 and/or P0154 may be displayed on CONSULT-II screen.
6. If DTC is detected, go to "Diagnostic Procedure" DTC P1148, P1168.
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 50 [HO2S1 (B1) signal] or 51 [HO2S1 (B2) 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 0.70V at least once.
- The voltage should go below 0.21V at least once.
4. If NG, go to "Diagnostic Procedure" DTC P1148, P1168.
Diagnostic Procedure
Perform trouble diagnosis for DTC P0133, P0153.