GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2000 🢒 Firebird 🢒 Engine 🢒 Engine Electrical 🢒 Diagnostic System Check - Engine Electrical

Test Description

The number(s) below refer to the step number(s) 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.

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 Powertrain control Module (PCM).

Does the scan tool communicate with the PCM?

Go to Step 4

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

4

Select the PCM display DTC function on the scan tool.

Does the scan tool display DTC's P0560, P0562, P0563, P0620 or P1637?

Go to Diagnostic Trouble Code (DTC) List/Type in Engine Controls - 3.8L or Diagnostic Trouble Code (DTC) List/Type in Engine Controls - 5.7L

Go to Symptoms