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Home › Dodge and Ram › 1999 › Caravan Base, 3.3 R › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes › Self-Diagnostic Tests › Test NTC-19: Checking Fuel Pump Relay Control Circuit

Test NTC-19: Checking Fuel Pump Relay Control Circuit

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.
  1. Turn ignition on with engine off. Using scan tool, actuate fuel pump relay and listen for clicking sound at fuel pump relay. Fuel pump relay is located in power distribution center at driver's side front corner of engine compartment, near battery. See Fig 1.
    Fig 1: Locating Fuel Pump Relay & Identifying Power Distribution Center Cavities
    G99J02008Courtesy of CHRYSLER CORP.
  2. If clicking sound was heard at fuel pump relay, go to next step. If no clicking sound was heard at fuel pump relay, go to step  6.
  3. With fuel pump relay still actuated, wiggle wiring harness and connectors between fuel pump relay and Powertrain Control Module (PCM) while checking for erratic operation of fuel pump relay or if fuel pump relay stops operating. PCM is located between driver's side front fender and power distribution center, near battery.
  4. If fuel pump relay operation does not become erratic or fuel pump relay does not stop operating, go to next step. If fuel pump relay operation becomes erratic or fuel pump relay stops operating, repair wiring or connectors as necessary. Perform TEST VER-2A .
  5. Turn ignition off. Inspect wiring and connectors between fuel pump relay and PCM. If no problems exist, test is complete. If any problems exist, repair wiring or connectors as necessary. Perform TEST VER-2A .
  6. Turn ignition off. Remove fuel pump relay from power distribution center. See Fig 1. Turn ignition on with engine off. Using voltmeter, check voltage at cavity "A" (White/Black wire) for fuel pump relay in power distribution center. See Fig 1.
  7. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open circuit on White/Black wire to fuel pump relay. White/Black wire goes from fuel pump relay in power distribution center to Positive Temperature Coefficient (PTC) No. 1 in junction block, located behind driver's side of instrument panel, to the left of steering column. PTC receives voltage when ignition is on. Perform TEST VER-2A .
    NOTE: PTC is a specified amperage solid-state circuit breaker located in junction box. PTC may reset when all current is removed from PTC for approximately 20 seconds.
  8. Using ohmmeter, check resistance between terminals No. 85 and 86 on fuel pump relay. See Fig 2. 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 .
    Fig 2: Identifying Fuel Pump Relay Terminals
    G95H32703Courtesy of CHRYSLER CORP.
  9. Ensure ignition is off. Disconnect connectors at PCM. PCM is located between driver's side front fender and power distribution center, near battery.
  10. Using ohmmeter, check resistance between cavity "C" (Brown wire) for fuel pump relay in power distribution center and PCM connector terminal No. 74 (Brown wire). See Fig 1.
  11. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit on Brown wire between PCM and cavity "C" for fuel pump relay in power distribution center. Perform TEST VER-2A .
  12. Using ohmmeter, check resistance between ground and PCM connector terminal No. 74 (Brown wire). If resistance is 5 ohms or more, replace PCM. Perform TEST VER-2A . If resistance is less than 5 ohms, repair short to ground on Brown wire between PCM and fuel pump relay. Perform TEST VER-2A .
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