GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2003 🢒 Grand Prix 🢒 Engine 🢒 Engine Electrical 🢒 Diagnostic System Check - Engine Electrical

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.

    2.

  2. The symptom list in Symptoms will determine the correct diagnostic procedure to use.

    3.

  3. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.

Step

Action

Yes

No

1

Did you perform the Battery Inspection/Test?

Go to Step 2

Go to Battery Inspection/Test

2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.

Does the scan tool power up?

Go to Step 3

Go to Scan Tool Does Not Power Up in Data Link Communications

3

Attempt to establish communication with the following:

    • Body Control Module (BCM)
    • Instrument panel cluster (IPC)
    • Powertrain control module (PCM)

Does the scan tool communicate with the IPC, DIM, and PCM?

Go to Step 4

Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications

4

Select the BCM, IPC and the PCM display DTC function on the scan tool.

Does the scan tool display any DTCs?

Go to Step 5

Go to Symptoms - Engine Electrical

5

Does the scan tool display any DTCs which begin with "U"?

Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications

Go to Diagnostic Trouble Code (DTC) List