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B2112-5 VOLT SUPPLY CIRCUIT LOW (FCM) (CONTINUED) For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes (F891) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND A/C PRESSURE TRANSDUCER FRONT CONTROL MODULE Diagnostic Test 1. CHECK FOR ACTIVE DTC With the scan tool, read the active DTC’s. Cycle the ignition switch from off to on, leaving the ignition on for a minimum of 90 seconds. With the scan tool, read the active DTC’s. Does the scan tool display this DTC as active? Yes >> Go To 2 No >> If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness con- nectors. Look for broken, bent, pushed out, or corroded terminals. 2. A/C PRESSURE TRANSDUCER Turn the ignition off. Disconnect the A/C Pressure Transducer harness connector. Cycle the ignition switch from off to on, leaving the ignition on for a minimum of 90 seconds. With the scan tool, read the active DTC’s. Does the scan tool display this DTC as active? Yes >> Go To 3 No >> Replace the A/C Pressure Transducer in accordance with the service information. Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL 8E - 6 ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS WK |