Inspection Procedure

INSPECTION PROCEDURE

1. Check voltage between terminals VF1, VF2 and E1 of Data Link Connector 1.





- Warm up engine at normal operating temperature.
- Connect terminals TE1 and E1 of Data Link Connector 1.
- Connect positive prove to terminal VF1, VF2 and negative prove to terminal E1 of Data Link Connector 1.
- Warm up the oxygen sensor by running engine at 2,500 rpm for about 2 minutes.
- Then, maintaining engine at 2,500 rpm, count how many times needle of voltmeter fluctuates between 0 and 5 volts;

Needle fluctuates of 8 times or more for every ten seconds; OK
Needle continues at 0.0 volts; proceed to step 2.
Needle continues at 5.0 volts; proceed to step 7.

2. Check voltage between terminals OX1, OX2 and E1 of data link connector 1.





- Warm up engine at normal operating temperature.
- Measure voltage between terminals OX1, OX2 and E1 of Data Link Connector 1 when engine is suddenly raced to full throttle.

Voltage should be 0.5 volts or higher at least once within 1 second.

- If OK proceed to step 7.
- If not OK proceed to step 3.
3. Check for open and short in harness and connector between Engine Control Module and Oxygen Sensor, Engine Control Module and Data Link Connector 1.
- If OK proceed to step 4.
- If not OK repair or replace harness or connector.
4. Check each item found to be a possible cause of problem.
- Check each circuit found to be a possible cause of trouble according to the results of the check in step 1 or step 2. The numbers in the table below show the order in which the checks should be performed.





- If OK proceed to step 5.
- If not OK repair or replace.
5. Check compression.
- If OK proceed to step 6.
- If not OK repair or replace.
6. Does malfunction disappear when a good Oxygen Sensor is installed?
- If YES replace Oxygen Sensor.
- If NO check and replace Engine Control Module
7. Check each item found to be a possible cause of problem.
- Check each circuit found to be a possible cause of trouble according to the results of the check in step 1. The numbers in the table below show the order in which the checks should be performed.





- If OK proceed to step 8.
- If not OK repair or replace.
8. Check compression.
- If OK proceed to step 9.
- If not OK repair or replace.
9. Does malfunction disappear when a good Oxygen Sensor is installed?
- If YES replace Oxygen Sensor.
- If NO check and replace Engine Control Module.