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DTC P1282: Fuel Pump/System Relay Control Circuit: Testing

  1. Turn ignition on, engine not running. With the DRBIII®, actuate the Fuel Pump Relay. Is the Fuel Pump Relay clicking? If yes, go to next step. If no, go to step  3.
    2. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  2. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.
  3. Turn the ignition off. Remove the Fuel Pump Relay from the PDC. Check connector and clean/repair as necessary. Measure the resistance between terminals No. 1 (85) and 2 (86) of the fuel pump relay connector. Is the resistance between 50 and 90 ohms? If yes, go to next step. If no, replace the fuel pump relay.
  4. Turn ignition on, engine not running. With a 12-volt test light connect to ground, probe the (F15) Fused Ignition Switch output circuit in the PDC. Does the test light illuminate brightly? If yes, go to the next step. If no, repair the open or short to ground in the (F15) Fused Ignition Switch Output circuit. Inspect the related fuse and repair as necessary.
  5. Turn the ignition off. Disconnect the PCM harness connectors. Check connectors and clean/repair as necessary. Measure the resistance of the Fuel Pump Relay Control circuit from the Fuel Pump Relay connector to the PCM harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the fuel pump relay control circuit for an open.
  6. Measure the resistance between ground and the (K31) Fuel Pump Relay Control circuit at the Fuel Pump Relay connector. Is the resistance below 100 ohms? If yes, repair the (K31) Fuel Pump Relay Control circuit for a short to ground. If no, go to next step.
    7. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  7. Using the wiring diagram as a guide, inspect the wire harness and connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
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