P1168

On Board Diagnosis Logic
The closed loop control has the one trip detection 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 3,200 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
1. Start engine and warm it up to normal operating temperature.
2. Select "DATA MONITOR" mode with CONSULT.




3. Hold engine speed at 2,000 rpm and check one of the following.

- "FR O2 SEN-B1 (-B2)" voltage should go above 0.70V at least once.
- "FR O2 SEN-B1 (-B2)" voltage should go below 0.21V 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 17 msec or more
CMPS.RPM (POS) 1,600 - 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 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.

Without CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes between ECM terminal 50 (front heated oxygen sensor right bank signal) or 51 (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 0.70V at least once.
- The voltage should go below 0.21V at least once.

4. If NG, go to "Diagnostic Procedure" below.

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