Check Engine Light Diagnostic Mode
- Turn ignition off. Connect an analog voltmeter to diagnostic connector terminal No. 1 and 12. Diagnostic connector is located next to a junction block above left kick panel. See Fig 1
.
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- Ensure all accessories are off. Turn ignition on. Count number of sweeps of voltmeter needle. As an example, one long sweep followed by a short pause followed by 4 short sweeps would indicate a code 14. See Fig 2
.
- Codes will continue to display until ignition is turned off. If CHECK ENGINE light flashes on and off continuously without pausing, this will be read as a zero, indicating a normal condition. This is a system normal condition providing no other fault codes were stored along with this code pattern.
- If CHECK ENGINE light illuminates steadily without flashing, this indicates a faulty ECU. There is no code translation for a CHECK ENGINE light that does not flash. Ensure ECU connectors, pins and terminals are properly connected before replacing an ECU.
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- Refer to FAULT CODES table to translate trouble code number to a system fault description. Once trouble area is identified, refer to No Start Test 1 (NS-1) or Driveability Test 1 (DR-1) trouble shooting chart to diagnose problem. Use trouble shooting chart titles to find appropriate chart.
- As an example, engine starts and runs but has a driveability problem. CHECK ENGINE light indicates a code 14. Refer to FAULT CODES
table to translate trouble code number to a system fault description.
- When fault code and system fault description are obtained, refer to DR-1 since vehicle has a driveability problem. Follow DR-1 chart until it leads you to a diamond box that asks DOES DISPLAY SHOW FAULT CODE 14?. This box will refer you to DR-5 for diagnosis.