Description

Code 4 is generated by the anti-lock electronic control module's detection of a resistance falling below 18 k Ohms (short) or above 26 k Ohms (open) in Circuit 535 (LB/R). This can indicate an open or short in the reset switch circuit, or a hydraulic leak into dump section of the valve.

Possible Contributing Base Brake Component/Vehicle Wiring Concerns
- Terminal backout in the module harness connector at Pin 6.
- Terminal backout in the RABS valve harness connector at Pins 2 or 3.
- Bulkhead connector (between engine compartment and instrument panel) terminal backout or loose connection.
- Anti-lock electronic control module or RABS valve connectors not fully mated with component.
- Intermittent open or open circuit in Circuits 535 (LB/R), or 274 (BK/W).
- Intermittent short or short circuit in Circuit 535 (LB/R).
- Defective RABS Valve.