Important Preliminary Inspections Before Beginning
Perform
Diagnostic System Check - Vehicle
before using the symptom tables, and verify that all of the following are true:
| • | The control module and malfunction indicator lamp (MIL) are operating correctly. |
| • | There are no DTCs stored. |
| • | Verify the customer concern and locate the correct symptom. Inspect the items indicated under that symptom. |
| • | Several of the symptom procedures ask for a careful visual and physical inspection. This step is extremely important. The visual and physical inspection can lead to correcting a problem without further inspections, and can save valuable time. |
| • | Inspect for improper installation of electrical components if an intermittent condition exists. Inspect for aftermarket theft deterrent devices, lights, and cellular phones. If you can not locate an intermittent condition, a cellular phone communication
signal may cause the condition. |
| • | If the intermittent condition exists as a start and then stall, test for DTCs relating to the vehicle theft deterrent system. |
Use the following tables when diagnosing a symptom complaint:
