P1148

ON BOARD DIAGNOSIS LOGIC
The closed loop control has the one trip detection logic.




DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

CAUTION: Always drive vehicle at a safe speed.

NOTE: If "DIAGNOSTIC TROUBLE CODE 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 3,600 rpm during the "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE". If the engine speed limit is exceeded, retry the procedure from step 1.
- Before performing the following procedure, confirm that battery voltage is more than 11V.

With Consult
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.
4. While holding engine speed at 2,000 rpm, check the following.
- "FR O2 SENSOR" voltage should go above 0.7V at least once.
- "FR O2 SENSOR" 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.

5. Let engine idle at least 3 minutes.
6. Maintain the following condition at least 50 consecutive seconds.
B/FUEL SCHDL: 2.5 ms or more
CMPS-RPM (REF): 2,000 - 3,500 rpm
Selector lever: Suitable position
VHCL SPEED SE: More than 70 kph (43 MPH)
During this test, P0130 may be displayed on CONSULT-II screen.
7. If 1St trip DTC is detected, go to "Diagnostic Procedure" below.

OR

OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the closed loop control. During this check, a 1st trip 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 (46) (sensor signal) and (43) (engine ground).
3. Check the following with engine speed held at 0.7V constant under no load.
- The voltage should go above 0.7V 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: