Test TC-101A - Fuel Pump Relay Control Circuit
NOTE:
For connector terminal ID, see CONNECTOR IDENTIFICATION Directory. For wiring diagram, see appropriate WIRING DIAGRAMS - NON-TURBO
article.
- Using scan tool, actuate fuel pump relay. If fuel pump relay is clicking, go to next step. If fuel pump relay is not clicking, go to step 5).
- Condition to set trouble code is not present at this time. FUEL PUMP RELAY CONTROL CIRCUIT DTC sets if an open or shorted condition is detected in fuel pump relay control circuit. Possible causes are: fuel pump relay coil open or shorted, fused ignition switch output circuit open, fuel pump relay control circuit is open or shorted or inoperative circuit driver in Powertrain Control Module (PCM). Go to next step.
- Inspect all related wiring and connectors and repair as necessary. For fuel pump relay location, See Fig 1. If no problems were found with wiring and connectors, go to next step. If related wiring and connectors were repaired, perform TEST VER-2A.
- Start engine. Wiggle wiring harness between fuel pump relay and PCM. If engine stalls, repair wiring harness as necessary where wiggling caused problem to appear. Perform TEST VER-2A. If engine did not stall, see INACTIVE TROUBLE CODE CONDITION . Test is complete. Perform TEST VER-2A.
- Disconnect fuel pump relay. For fuel pump relay location, see Fig 1. Using scan tool in voltmeter mode, check voltage on fuel pump relay connector fused ign. switch output circuit. See Fig 2. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open fused ignition switch output circuit. Perform TEST VER-2A.
- Using an external ohmmeter, check resistance between fuel pump relay terminals. See Figure. If resistance is less than 100 ohms, go to next step. If resistance is 100 ohms or more, replace fuel pump relay. Perform TEST VER-2A.
- Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of fuel pump relay control circuit at fuel pump relay connector. See Fig 2 for terminal identification. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in fuel pump relay control circuit. Perform TEST VER-2A.
- Using an external ohmmeter, measure resistance of fuel pump relay control circuit between fuel pump relay connector and PCM connector terminal No. 74 (Black/Dark Blue wire). See 46 for wire identification. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2A. If resistance is 5 ohms or more, repair open fuel pump relay control circuit. Perform TEST VER-2A.