P1168
DTC P1168 CLOSED LOOP CONTROLOn Board Diagnosis Logic:
On 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 given condition at least 50 consecutive seconds.
During this test, P0132 and/or P0152 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 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" below.
Diagnostic Procedure
Diagnostic Procedure (Steps 1 - 2):
Diagnostic Procedure (Steps 3 - 4):
Diagnostic Procedure (Step 5):
Diagnostic Procedure (Steps 6 - 7):
