Chart 1 Powertrain System Check

Diagnostic Chart:

Service Engine Soon Light Circuit:

SERVICE PRECAUTION
Lack of basic knowledge of this powertrain when performing diagnostic procedures could result in incorrect diagnosis or damage to powertrain components. Do not, under any circumstances, attempt to diagnose a powertrain problem without this basic knowledge. Refer to Powertrain Management / Description and Operation for additional information. Description and Operation

NOTES ON CHART 1
1. Checking if vehicle will enter diagnostics. If it will not, then there is an on-board diagnostic system fault that can be diagnosed by using the Self-Diagnostic System Check. Testing and Inspection

2. Checking to see if the Instrument Panel Cluster (IPC) is able to communicate with the Powertrain Control Module (PCM). If it is not, Code IO34 will set or "NO PCM DATA" message will be displayed when using diagnostics.

3. Malfunction Indicator Lamp (MIL) (Service Engine Soon) should be "ON" when vehicle is in diagnostic mode.

4. Checking if powertrain system is operational.

5. Checking for PCM codes set that should be diagnosed.

6. MIL should be "OFF" with no codes set.

7. Checking if a known customer complaint is causing the problem.

8. If your complaint is not in the customer complaint list, perform the system check which you feel may apply to your situation.