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 the 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.
During this test, P0132 and/or P0154 may be displayed on CONSULT-II screen.
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 the 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 Step 1 - 2:
Diagnostic Procedure Step 3 - 4:
Diagnostic Procedure Step 5:
Diagnostic Procedure Step 6 - 7:
Diagnostic Procedure Step 8 - 12:
Diagnostic Procedure Step 13:
Diagnostic Procedure
Component Inspection
HEATED OXYGEN SENSOR 1
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select "MANU TRIG" and adjust "TRIGGER POINT" to 100% in "DATA MONITOR" mode with CONSULT-II.
3. Select "HO2S1 (B1)/(B2)" and "HO2S1 MNTR (B1)/(B2)".
4. Hold engine speed at 2,000 rpm under no load during the following steps.
5. Touch "RECORD" on CONSULT-II screen.
6. Check the following.
- "HO2S1 MNTR (B1)/(B2)" in "DATA MONITOR" mode changes from "RICH" to "LEAN" to "RICH" 5 times in 10 seconds.
5 times (cycles) are counted as shown at right.
- "HO2S1 (B1)/(B2)" voltage goes above 0.6 V at least once.
- "HO2S1 (B1)/(B2)" voltage goes below 0.3 V at least once.
- "HO2S1 (B1)/(B2)" voltage never exceeds 1.0 V.
CAUTION:
- Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
- Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
Without CONSULT-II
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 fluctuates between 0 to 0.3 V and 0.6 to 1.0 V more than 5 times within 10 seconds.
- The maximum voltage is over 0.6 V at least one time.
- The minimum voltage is below 0.3 V at least one time.
- The voltage never exceeds 1.0 V.
1 time: 0 - 0.3 V -> 0.6 - 1.0 V -> 0 - 0.3 V
2 times: 0 - 0.3 V -> 0.6 - 1.0 V -> 0 - 0.3 V -> 0.6 - 1.0 V
CAUTION:
- Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
- Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.