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Possible Causes (A209) PCM FUSED B+ CIRCUIT PCM NO RESPONSE (F1) (F26) PCM FUSED IGNITION SWITCH OUTPUT CIRCUITS (Z130) (Z131) PCM GROUND CIRCUITS CRANKSHAFT POSITION SENSOR (F855) 5-VOLT SENSOR OPEN/SHORTED (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND PCM Diagnostic Test 1. (A209) PCM FUSED B+ CIRCUIT NOTE: The scan tool and cable must be operating properly for the NOTE: Make sure the ignition switch was on while trying to com- Disconnect the C1 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the Does the test light illuminate brightly? Yes >> Go To 2 No >> Repair the open or short to ground in the (A209) Fused B+ circuit. Inspect and replace fuses as necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 2. (F1) (F26) PCM FUSED IGNITION SWITCH CIRCUITS Using a 12-volt test light connected to ground, probe the PCM Fused Does the test light illuminate brightly? Yes >> Go To 3 No >> Repair the (F1) and (F26) Ignition Switch Output circuits. Inspect and replace fuses as necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - 630 ENGINE ELECTRICAL DIAGNOSTICS KJ |