CLOSED LOOP-B1

* The closed loop control has the one trip detection logic.




ON BOARD DIAGNOSIS LOGIC




DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

CAUTION: Always drive vehicle at a sate speed.

NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 10 seconds before conducting the next test.

TESTING CONDITION:
- Before performing following procedure, confirm that battery voltage is more than 11 V at idle.
- Never raise engine speed above 3,600 rpm (A/T), 4,000 rpm (M/T) during the "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE". If the engine speed limit is exceeded, retry the procedure from step 2.

With Consult
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch "OFF" and wait at least 10 seconds.
3. Turn ignition switch "ON" again and select "DATA MONITOR" mode with CONSULT.
4. Start engine and hold engine speed at 2,000 rpm.
5. Check the following.
- "FR O2 SENSOR" voltage should go above 0.70 V at least once.

OR

- "FR O2 SENSOR" voltage should go below 0.21 V at least once.
If the check result is NG, perform "DIAGNOSIS PROCEDURE".
If the check result is OK, perform the following step.
6. Let engine idle at least 3 minutes.
7. Maintain the following condition at least 50 consecutive seconds.
B/FUEL SCHDL: 1.5 msec or more
CKPS.RPM (POS): 1,800 - 3,000 rpm
Selector lever: Suitable position
VHCL SPEED SE: More than 70 KPH (43 MPH)
8. It DTC is detected, go to "DIAGNOSTIC PROCEDURE" below.
During this test, P0130 and/or P0150 may be displayed on CONSULT screen.

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 LH, (51) RH, (50) (sensor) and 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.

OR

- The voltage should go below 0.21 V at least once.
4. If NG, go to "DIAGNOSTIC PROCEDURE" below.

DIAGNOSTIC PROCEDURE
Refer to TROUBLE DIAGNOSIS FOR DTC P0130 P0150.