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ABS-4 - Code 51 (Fail-Safe Relay)

  1. Check ABS PUMP fuse (60-amp) in main fuse box. Main fuse box is located in engine compartment. If ABS PUMP fuse is okay, check fail-safe relay for open. See RELAY BOX (FAIL-SAFE RELAY RESISTANCE TEST) under COMPONENT TESTING.
  2. If fail-safe relay is okay, check for open or short to ground in wiring harness between fail-safe relay and hydraulic unit or ABS control unit. See RELAY BOX (FAIL-SAFE RELAY HARNESS TEST) under COMPONENT TESTING. If open or short in wiring harness does not exist, check ABS warning light operation. If ABS warning light illuminates constantly after turning ignition on, replace ABS control unit.
  3. If ABS warning light does not illuminate after turning ignition on, a temporary poor contact in wiring may have occurred and ABS system is now functioning properly.
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