DTC P1282: Fuel Pump Relay Control Circuit: Testing
- Turn ignition on. Using scan tool, actuate fuel pump relay. Fuel pump relay is located in Power Distribution Center (PDC). PDC is located on left side of engine compartment. See Figure . If fuel pump relay clicks, go to next step. If fuel pump relay does not click, go to step 4 .
- Ensure ignition is on. Wiggle wiring harness from fuel pump relay to Powertrain Control Module (PCM) while actuating fuel pump relay. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). See Figure . If fuel pump relay stops clicking at any time while wiggling wiring harness, repair wiring harness where wiggling caused fuel pump relay to stop clicking. If fuel pump relay does not stop clicking at any time while wiggling wiring harness, go to next step.
- Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition:
- With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set.
- Review freeze frame information on scan tool. Duplicate conditions present when DTC was set.
- Refer to any technical service bulletins that may apply.
- Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires.
- Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals.
If a problem is found, repair as necessary. If no problems are found, test is complete.
- Turn ignition off. Remove fuel pump relay from PDC. Turn ignition on. Measure voltage between ground and terminal "A" (Dark Blue/White wire) at fuel pump relay harness connector. See Fig 1 . If voltage is more than 11 volts, go to next step. If voltage is 11 volts or less, repair open or short in fused ignition switch output circuit. See WIRING DIAGRAMS article.
- Turn ignition off. Measure resistance between terminals "A" and "C" at fuel pump relay. See Figure . If resistance is 70-90 ohms, go to next step. If resistance is not 70-90 ohms, replace fuel pump relay.
- Ensure ignition is off. Disconnect PCM harness connectors. See Figure . Measure resistance of fuel pump relay control circuit (Brown wire) between terminal "C" at fuel pump relay harness connector and terminal No. 74 at PCM C2 harness connector. See Figure and Fig 1 . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Brown wire.
- Measure resistance between ground and terminal "C" (Brown wire) at fuel pump relay harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Brown wire.
- If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.