Test Description
WARNING: This page is about a different variant/trim than selected.
The numbers below refer to the step numbers on the diagnostic table.
- 3: This step determines if the condition is located on the coil side or the switch side of the circuit.
- 4: This step verifies that the PCM is providing voltage to the fuel pump relay.
- 5: This step tests for an open in the ground circuit to the fuel pump relay.
- 6: This step determines if a voltage is constantly being applied to the fuel pump relay.
- 13: This step determines if the condition with the circuit is intermittent. If the fuse does not open, inspect the supply voltage circuit between the fuse and the fuel pump for an intermittent condition.
Fuel Pump Electrical Circuit Diagnosis
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Component Views or Powertrain Control Module Connector End Views |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
Go to Diagnostic Aids | Go to Step 3 |
| 3 | Command the fuel pump relay ON and OFF with a scan tool. Do you hear a click when you command the fuel pump relay ON and OFF? |
Go to Step 9 | Go to Step 4 |
| 4 |
|
Go to Step 5 | Go to Step 6 |
| 5 |
|
Go to Step 19 | Go to Step 22 |
| 6 | Does the test lamp remain illuminated with each command? | Go to Step 7 | Go to Step 8 |
| 7 | Test the control circuit of the fuel pump relay for a short to voltage. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 27 | Go to Step 26 |
| 8 | Test the control circuit of the fuel pump relay for a short to ground or an open. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 27 | Go to Step 20 |
| 9 | Turn ON the ignition, with the engine OFF. Does the fuel pump operate continuously? |
Go to Step 10 | Go to Step 11 |
| 10 |
|
Go to Step 21 | Go to Step 25 |
| 11 | Is the fuel pump fuse open? | Go to Step 12 | Go to Step 14 |
| 12 |
|
Go to Step 27 | Go to Step 13 |
| 13 |
|
Go to Step 24 | Go to Testing for Intermittent Conditions and Poor Connections |
| 14 |
|
Go to Step 15 | Go to Step 23 |
| 15 | Connect a 15-amp fused jumper wire between the battery voltage circuit of the fuel pump relay switch and the supply voltage circuit of the fuel pump. Does the fuel pump operate? |
Go to Step 19 | Go to Step 16 |
| 16 | Test the supply voltage circuit of the fuel pump for an open or high resistance between the fuel pump relay and the fuel pump. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 27 | Go to Step 17 |
| 17 |
IMPORTANT:
Inspect the ground circuit for being tight, corrosion on terminals, or damage to the wiring harness. Test the ground circuit of the fuel pump for an open or high resistance. Refer to Circuit Testing
and Wiring Repairs
.Did you find and correct the condition? |
Go to Step 27 | Go to Step 18 |
| 18 | Inspect for poor connections at the fuel pump. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 27 | Go to Step 24 |
| 19 | Inspect for poor connections at the fuel pump relay. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 27 | Go to Step 25 |
| 20 | Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 27 | Go to Step 26 |
| 21 | Repair the supply voltage circuit of the fuel pump for a short to voltage. Refer to Wiring Repairs
. Did you complete the repair? |
Go to Step 27 | - |
| 22 | Repair the open fuel pump relay ground circuit. Refer to Wiring Repairs
. Did you complete the repair? |
Go to Step 27 | - |
| 23 | Repair the battery voltage circuit of the fuel pump relay switch. Refer to Wiring Repairs
. Did you complete the repair? |
Go to Step 27 | - |
| 24 |
IMPORTANT:
Inspect for poor connections at the fuel pump, within the fuel tank, before replacing the fuel pump.
|
Go to Step 27 | - |
| 25 | Replace the fuel pump relay. Did you complete the replacement? |
Go to Step 27 | - |
| 26 | Replace the PCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 27 | - |
| 27 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? |
Go to Diagnostic Trouble Code (DTC) List - Vehicle | System OK |