LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jeep >> 1997 >> Wrangler SE, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.5L >> Trouble Code Tests >> Test TC-101A - Fuel Pump (System) Relay Control Circuit
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test TC-101A - Fuel Pump (System) Relay Control Circuit

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.
  1. Using scan tool, actuate Fuel Pump (FP) relay. If FP relay does not click, go to step 5). If FP relay clicks, go to next step.
  2. Condition required to set DTC is not present at this time. FUEL PUMP RELAY CONTROL CIRCUIT DTC sets if an open or short is detected in FP relay circuit. Possible causes are: open or short in FP relay control circuit, open or short in FP relay fused ignition switch output circuit, FP relay coil open or shorted, inoperative circuit driver in Powertrain Control Module (PCM) or PCM failure. Go to next step.
  3. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, go to next step.
  4. Using scan tool, actuate FP rely. Wiggle wiring harness from FP relay to PCM. If FP relay stops clicking while wiggling wiring harness, repair wiring harness as necessary and perform TEST VER-2A. If FP relay does not stop clicking while wiggling wiring harness, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
  5. Remove FP relay. Inspect FP relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
  6. Using an external voltmeter, check voltage on FP relay connector, fused ignition switch output circuit (Red/Light Green wire). If voltage is 10 volts or less, repair open fused ignition switch output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
  7. Using an external ohmmeter, check resistance across FP relay terminals. See Figure. If resistance is 100 ohms or more, replace FP relay and perform TEST VER-2A. If resistance is less than 100 ohms, go to next step.
  8. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
  9. Check resistance between ground and PCM Gray connector, FP relay control circuit. See FUEL PUMP RELAY CONTROL CIRCUIT IDENTIFICATION table. If resistance is less than 5 ohms, repair short to ground in FP relay control circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
    FUEL PUMP RELAY CONTROL CIRCUIT IDENTIFICATION

    Application Wire Color
    TJ Body Brown
  10. Check resistance of FP relay control circuit (Brown wire) between FP relay connector and PCM Gray connector. If resistance is 5 ohms or more, repair open FP relay control circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A.
scientia non olet · About LEMON Manuals