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

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For component location and wiring diagram, see WIRING DIAGRAMS article.

1. On all bodies except AB body, go to next step. On AB body, use scan tool to read DTCs. If WARM-UP CYCLE COUNTER counter is not displayed or displayed count is not "0", go to step 6)  . If WARM-UP CYCLE COUNTER is displayed and displayed count is "0", go to next step.
2. Using scan tool, actuate Fuel Pump (FP) relay. If FP relay does not click, go to step 6)  . If FP relay clicks, go to next step.
3. 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.
4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If wiring and connectors are okay, go to next step.
5. Using scan tool, actuate FP relay. 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: ROAD TEST VERIFICATION . If FP relay does not stop clicking while wiggling wiring harness, see INACTIVE DTC CONDITION . Test is complete. Perform TEST VER-2A: ROAD TEST VERIFICATION .
6. Remove FP relay. Inspect FP relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If connector and terminals are okay, go to next step.
7. Using an external voltmeter, check voltage on FP relay connector, fused ignition switch output circuit (Red/Light Green wire on TJ body; Dark Blue/White wire on XJ body; Orange wire on ZJ body; Light Green/Black wire on all other bodies). If voltage is 10 volts or less, repair open fused ignition switch output circuit and perform TEST VER-2A: ROAD TEST VERIFICATION . If voltage is more than 10 volts, go to next step.
8. Using an external ohmmeter, check resistance across FP relay terminals. See Fig 1 or Fig 2 . If resistance is 100 ohms or more, replace FP relay and perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is less than 100 ohms, go to next step.
9. 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: ROAD TEST VERIFICATION . If connectors and terminals are okay, go to next step.
10. 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: ROAD TEST VERIFICATION . If resistance is 5 ohms or more, go to next step.
    FUEL PUMP RELAY CONTROL CIRCUIT IDENTIFICATION
    
    

    Application	Wire Color
    AB, TJ & XJ Bodies	Brown
    AN Body	Light Blue/Orange
    BE/BR & DN Bodies	Brown/White
    ZJ Body	Dark Blue

11. Check resistance of FP relay control circuit between FP relay connector and PCM Gray connector. See FUEL PUMP RELAY CONTROL CIRCUIT IDENTIFICATION  table. If resistance is 5 ohms or more, repair open FP relay control circuit and perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A: ROAD TEST VERIFICATION .

Fig 1: TC-101A1: Testing Fuel Pump Relay (Except XJ Body)

Fig 2: TC-101A2: Testing Fuel Pump Relay (XJ Body)