Retrieving Codes
NOTE:
Perform appropriate FUNCTIONAL TEST chart under TROUBLE SHOOTING CHARTS. See Figure
or Figure
.
- If using Tech 1 for retrieving codes, go to step 3). If using ANTILOCK 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 jumpered.NOTE: The DLC may also be referred to as the Assembly Line Data Link (ALDL) connector. This is the same connector and the terms may be used interchangeably.
- Trouble codes will begin displaying by a flashing ANTILOCK warning light. As an example, Code 25 would be displayed by ANTILOCK warning light flashing 2 times, followed by a pause, then flashing 5 more times. See 4WAL FAULT CODES table for diagnosis. See CLEARING FAULT CODES to erase stored trouble codes. If no fault codes are present, see 4WAL SYMPTOM DIAGNOSIS table.
- Turn ignition off. Connect Tech 1 to DLC. Access 4WAL brake trouble codes with Tech 1. Tech 1 will display trouble code(s). Repair trouble codes in order they appear. See 4WAL FAULT CODES table for diagnosis. See CLEARING FAULT CODES for erasing stored trouble codes. If no fault codes are present, see 4WAL SYMPTOM DIAGNOSIS table.
4WAL SYMPTOM DIAGNOSIS
| Symptom | Perform Chart | ||
|---|---|---|---|
| ANTILOCK Light On | ANTILOCK LIGHT ON (Fig. 10) | ||
| ANTILOCK Light Off | ANTILOCK LIGHT OFF (Fig. 11) | ||
| Brake Pedal Pulses(1) | BRAKE PEDAL PULSES (Fig. 12) | ||
| Wheel Pull During Hard Braking(1) | WHEEL PULL DURING HARD BRAKING (Fig. 13) | ||
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4WAL FAULT CODES
| Diagnostic Trouble Code | Description | ||
|---|---|---|---|
| 21 | Right Front Speed Sensor Or Circuit Open | ||
| 22 | Missing Right Front Speed Signal | ||
| 23 | Erratic Right Front Speed Sensor | ||
| 25 | Left Front Speed Sensor Or Circuit Open | ||
| 26 | Missing Left Front Speed Signal | ||
| 27 | Erratic Left Front Speed Sensor | ||
| 29 | Simultaneous Drop-Out Of Front Speed Sensors | ||
| 31 | Right Rear Speed Sensor Or Circuit Open | ||
| 32 | Missing Right Rear Speed Signal (AWD) | ||
| 33 | Erratic Right Rear Speed Sensor (AWD) | ||
| 35 | Open Or Grounded Vehicle Speed Signal Circuit (2WD/4WD) | ||
| 35 | Left Rear Speed Sensor Or Circuit Open (AWD) | ||
| 36 | Missing Vehicle Speed Sensor Signal (2WD/4WD) | ||
| 36 | Missing Left Rear Speed Signal (AWD) | ||
| 37 | Erratic Vehicle Speed Sensor Signal (2WD/4WD) | ||
| 37 | Erratic Left Rear Speed Sensor (AWD) | ||
| 38 | Wheel Speed Error | ||
| 41-54 | Control Valves | ||
| 61, 62 Or 63 | Reset Switches | ||
| 65 Or 66 | Open Or Shorted Pump Motor Relay | ||
| 67(1) | Open Motor Circuit Or Shorted BPMV Output | ||
| 68(1) | Locked Motor Or Shorted Motor Circuit | ||
| 71-74 | Memory Errors | ||
| 81 | Brake Switch Circuit Shorted Or Open | ||
| 86 | Shorted Anti-Lock Indicator Light | ||
| 88 | Shorted Brake Warning Light | ||
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