Diagnostic System Check - Engine Electrical. Pontiac GTO 2004

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 2004 🢒 GTO 🢒 Engine 🢒 Engine Electrical 🢒 Diagnostic System Check - Engine Electrical

Test Description

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

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

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

The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will collect all the available information before you perform tests.

Step

Action

Yes

Perform the Battery Inspection/Test. Refer to Battery Inspection/Test .

Does the battery pass the test?

Go to Step 2

Install a scan tool.
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

Turn ON the ignition, with the engine OFF.
Attempt to communicate with each of the following modules:

•	Powertrain control module (PCM)

•	Powertrain interface module (PIM)

•	Body control module (BCM)

•	Instrument panel cluster (IPC)

Does the scan tool communicate with all of the modules?

Go to Step 4

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

Select the Display DTCs function for each module.
Record all of the displayed DTCs, the DTC status, and the module which set the DTC.

Does the scan tool display any DTCs?

Go to Step 5

Go to Symptoms - Engine Electrical

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

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

Go to Step 6

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

Go to Diagnostic Trouble Code (DTC) List in Body Control System

Go to Diagnostic Trouble Code (DTC) List