Fuel System Electrical Circuit

Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
Using scan tool, command fuel pump on. If fuel pump operates, no problem is present at this time. Check for intermittent problem. See INTERMITTENTS in appropriate TROUBLE SHOOTING - NO CODES article. If fuel pump does not operate, go to next step.
Using scan tool, check for DTCs. If DTC P0230 is set, go to DTC P0230 in appropriate SELF-DIAGNOSTICS article. If DTC P0230 is not set, go to next step.
Inspect F/PMP fuse (15-amp), located in underhood fuse block. If fuse is okay, go to step 9 . If fuse is faulty, go to next step.
Turn ignition off. Disconnect fuel pump relay. Using DVOM, measure resistance between ground and battery positive feed circuit at fuel pump relay connector. If resistance is greater than 2 ohms, go to next step. If resistance is not as specified, go to step 13 .
Disconnect fuel pump harness connector. Using DVOM, measure resistance between ground and fuel pump feed circuit at fuel pump relay connector. If resistance is greater than 2 ohms, go to next step. If resistance is not as specified, go to step 14 .
Replace faulty fuse. Reconnect fuel pump relay. Using scan tool, command fuel pump relay on and off. Recheck fuse. If fuse is okay, go to next step. If fuse is faulty, go to step 19 .
Reconnect fuel pump harness connector. Using scan tool, command fuel pump relay on and off. Recheck fuse. If fuse is okay, problem is intermittent. See INTERMITTENTS in appropriate TROUBLE SHOOTING - NO CODES article. If fuse is faulty, go to step 21 .
Disconnect fuel pump relay. Using a test light connected to ground, probe battery feed circuit at fuel pump relay connector. If test light illuminates, go to next step. If test light does not illuminate, go to step 15 .
Using a fused jumper wire, connect fuel pump relay battery feed circuit to fuel pump feed circuit in fuel pump relay connector. If fuel pump operates, go to step 18 . If fuel pump does not operate, go to next step.
Leave jumper wire connected. Raise and support vehicle. Disconnect fuel pump harness connector. Connect a test light between fuel pump feed circuit and fuel pump ground circuit at fuel pump harness connector (harness side). If test light illuminates, go to step 20 . If test light does not illuminate, go to next step.
Using a test light connected to ground, probe fuel pump feed circuit at fuel pump harness connector (harness side). If test light illuminates, go to step 17 . If test light does not illuminate, go to step 16 .
Repair short to ground in battery feed circuit to fuel pump relay connector. After repairs, go to step 22 .
Repair short to ground in fuel pump feed circuit. After repairs, go to step 22 .
Repair open or high resistance in battery feed circuit to fuel pump relay. After repairs, go to step 22 .
Repair open or high resistance in fuel pump feed circuit. After repairs, go to step 22 .
Repair open or high resistance in fuel pump ground circuit. After repairs, go to step 22 .
Check for poor terminal connections at fuel pump relay connector. Repair as necessary. After repairs, go to step 22 . If connections are okay, go to next step.
Replace fuel pump relay. After repairs, go to step 22 .
Check for poor terminal connections at fuel pump harness connector. Repair as necessary. After repairs, go to step 22 . If connections are okay, go to next step.
Replace fuel pump. After repairs, go to step 22 .
Using scan tool, command fuel pump on. If fuel pump operates, system is okay. If fuel pump does not operate, go to step 2 .