Diagnostic Trouble Code Diagnostics Inoperative

CAUTION: If Anti-Lock Brake System (ABS) Electronic Control Unit (ECU) replacement is necessary during testing, always ensure ABS ECU connectors and ground circuit are okay. If either is suspect, repair and repeat testing to confirm ABS ECU malfunction.

Check ABS warning light circuit. See ABS WARNING LIGHT CIRCUIT under SYSTEM TESTS. Check Tc terminal circuit. See Tc TERMINAL CIRCUIT under SYSTEM TESTS. If all preceding tests are okay, replace ABS ECU.