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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Engine Controls - Self Diagnostics - 4.7L) >> Diagnostic Tests >> DTC P0627: Fuel Pump Relay Circuit >> Testing

DTC P0627: Fuel Pump Relay Circuit: Testing

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn the ignition on. With the DRBIII® scan tool, actuate the fuel pump relay. Is the fuel pump relay operating? If yes, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
  2. Turn the ignition off. Remove the fuel pump relay from the IPM. Ignition on, engine not running. Using a 12-volt test light connected to ground, probe the (F18) fused ignition switch output circuit in the IPM. Does the test light illuminate? If yes, go to next step. If no, repair the (F18) fused ignition switch output circuit, inspect the related fuse. An open fuse may have been caused by a short to ground.
  3. Turn the ignition off. Measure the resistance of the fuel pump relay coil. Is the resistance 70-90 ohms? If yes, go to next step. If no, replace the fuel pump relay.
    4. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  4. Disconnect the PCM harness connectors. Measure the resistance of the (K31) fuel pump relay control circuit from the PDC to the appropriate terminal of the Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the (K31) fuel pump relay control circuit.
  5. Measure the resistance between ground and the (K31) fuel pump relay control circuit in the PDC. Is the resistance below 5.0 ohms? If yes, repair the short to ground in the (K31) fuel pump relay control circuit. If no, go to next step.
    6. NOTE: Before continuing, disconnect the PCM harness connectors and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.
  6. Using the wiring diagram as a guide, inspect the wire harness and connectors. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect both the component and the PCM connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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