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 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.
- "HO2S1 (B1)/(B2)" voltage should go above 0.70 V at least once.
- "HO2S1 (B1)/(B2)" voltage should go below 0.21 V at least once.
If the check result is NG, perform "Diagnostic Procedure".
If the check result is OK, perform the following step.
4. Let engine idle at least 5 minutes.
5. Maintain the specified condition at least 50 consecutive seconds.
6. If DTC is detected, go to "Diagnostic Procedure".
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 35 [HO2S1 (B1) signal] or 16 [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 0.70 V at least once.
- The voltage should go below 0.21 V at least once.
4. If NG, go to "Diagnostic Procedure".
Diagnostic Procedure
Perform trouble diagnosis for "DTC P0133, P0153". Refer to "Diagnostic Procedure".