Retrieving Codes
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 1996 Chevrolet Chevy Van, 1995 GMC Vandura Special, 1995 GMC Vandura, 1995 GMC Rally Camper Special, and 1995 GMC Rally. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Perform FUNCTIONAL TEST under TROUBLE SHOOTING CHARTS .
- If using Tech 1 for retrieving codes, go to step 3). If using ANTI-LOCK light for retrieving codes, turn ignition on. Using a jumper wire, connect terminal "H" to terminal "A" in Data Link Connector (DLC). See Fig 1. System will repeat trouble code(s) as long as DLC terminals are connected.NOTE: The DLC may also be referred to as the Assembly Line Data Link (ALDL) connector. These 2 terms may be used interchangeably.
- Trouble codes will be displayed by a flashing ANTI-LOCK warning light. As an example, Code 25 would be displayed by ANTI-LOCK warning light flashing 2 times, followed by a pause, then flashing 5 more times. See 4WAL FAULT CODES table for diagnosis. If no fault codes are present, see 4WAL SYMPTOM DIAGNOSIS table.
- Turn ignition off. Connect Tech 1 to DLC. Access 4WAL brake trouble codes using Tech 1. Repair trouble codes in order they appear. See 4WAL FAULT CODES table for diagnosis. If no fault codes are present, see 4WAL SYMPTOM DIAGNOSIS table.
4WAL SYMPTOM DIAGNOSIS
| Symptom | See | ||
|---|---|---|---|
| Functional Test | Figure | ||
| ANTI-LOCK Light On | Figure | ||
| ANTI-LOCK Light Off (1) | Figure | ||
| Brake Pedal Pulses (1) | Figure | ||
| Wheel Pull During Hard Braking (1) | Figure | ||
|
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4WAL FAULT CODES
| DTC | See |
|---|---|
| 21 | Figure |
| 22 | Figure |
| 23 | Figure |
| 25 | Figure |
| 26 | Figure |
| 27 | Figure |
| 29 | Figure |
| 35 | Figure |
| 36 | Figure |
| 37 | Figure |
| 38 | Figure |
| 41-54 | Figure |
| 65 Or 66 | Figure |
| 67 Or 68 | Figure |
| 71-74 | Figure |
| 81 | Figure |
| 86 | Figure |
| 88 | Figure |