Test Description
WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below Refer to the step numbers in the diagnostic table.
- 2) - Lack of communication may be due to partial or total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
- 4) - The presence of DTCs that begin with a "U" indicates that some other module is not communicating. The specified procedure will compile all of the available information before tests are performed.
Diagnostic System Check - ABS
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Install a scan tool. Does the scan tool power up? | Go to Step 2 | Go to SCAN TOOL DOES NOT POWER UP in Data Link Communications |
| 2 |
|
Go to Step 3 | Go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in Data Link Communication |
| 3 | Use the scan tool in order to display DTCs for the following control modules:
|
Go to Step 4 | Go to Symptoms - Anti-Lock Brake System |
| 4 | Does the scan tool display any DTCs that begin with a "U", DTC C0292 or DTC C0297? | Go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in Data Link Communications | Go to Step 5 |
| 5 | Does the scan tool display DTC P0500, P0562, P0563, P0601, P0602, P0603, P0604, P0605, P1621, or P1381? | Go to DIAGNOSTIC TESTS in Engine Controls - 4.3L | Go to Step 6 |
| 6 | Does the scan tool display DTC B1367? | Go to DIAGNOSTIC TROUBLE CODE (DTC) LIST in Instrument Panel, Gauges & Console | Go to Diagnostic Trouble Code (DTC) List |