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C2200-ANTI—LOCK BRAKE MODULE INTERNAL (CONTINUED) For the ABS circuit diagram (Refer to 5 - BRAKES - SCHEMATICS AND DIAGRAMS) For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes ABM - GROUND CIRCUIT OPEN ABS FUSED B(+) CIRCUIT OPEN ABS PUMP FUSED B(+) CIRCUIT OPEN ABM - INTERNAL FAULT Diagnostic Test 1. ABM INTERNAL FAILURE DTC PRESENT Turn the ignition on. With the scan tool, read DTCs. With the scan tool, erase DTCs. Turn the ignition off. Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display ANTI—LOCK BRAKE MODULE Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. 2. CAB - GROUND CIRCUIT OPEN Turn the ignition off. Disconnect the ABM harness connector. Note: Check clean connectors and terminals,. Using a 12-volt test light connected to 12-volts, probe the ABM har- Did the test light illuminate? Yes >> Go To 3 No >> Repair the ABM Ground circuit for an open. Perform ABS VERIFICATION TEST - VER 1. HB BRAKES - ABS ELECTRICAL DIAGNOSTICS 5 - 263 |