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U0401–IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM For a complete wiring diagram Refer to Section 8W • When Monitored: • Set Condition: Possible Causes ABM CAN BUS DTCS ENGINE DTCS ANTI-LOCK BRAKE MODULE Diagnostic Test 1. CHECK FOR DTC U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM NOTE: This DTC must be active for the results of this test to be valid. With the scan tool, record and erase DTCs. Cycle the ignition switch from off to on. With the scan tool, read DTCs. Does the scan tool display: U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM? Yes >> Go To 2 No >> Perform the ABS Intermittent Condition diagnostic procedure in this Section. Refer to the ABS-INTERMITTENT CONDITION TEST. (Refer to 5 - BRAKES - DIAGNOSIS AND TEST- 2. CHECK IF TIPM CAN BUS DTCs ARE PRESENT With the scan tool, read TIPM DTCs. Are there any TIPM CAN BUS DTCs present? Yes >> Refer to the appropriate diagnostic. (Refer to 8-ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING). Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE). No >> Go To 3 3. CHECK IF ENGINE DTCs ARE PRESENT With the scan tool, read Engine DTCs. Are there any Engine DTCs present? Yes >> Refer to the 9 - ENGINE ELECTRICAL DIAGNOSTICS and diagnose the appropriate symptom. Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE). No >> Using the schematics as a guide, check the Anti-Lock Brake Module pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE). PM BRAKES - ABS ELECTRICAL DIAGNOSTICS 5 - 281 |