P1148

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 4.
- 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 the following.
- "FR O2 SEN-B1" voltage should go above 0.70 V at least once.
- "FR O2 SEN-B1" voltage should go below 0.21 V at least once. If the result is NG, perform "Diagnosis Procedure". If the result is OK, perform the following step.

4. Let engine idle at least 4 minutes.




5. Maintain the following condition at least 50 consecutive seconds.
During this test, P0130 DTC 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 Generic Scan Tool
1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes between ECM terminal 62 (Front heated oxygen sensor 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".

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DIAGNOSTIC PROCEDURE