The control module enables the fuel pump relay when the ignition switch is turned ON.
The control module will disable the fuel pump relay within two seconds unless the control module detects ignition reference pulses. The control module continues to enable the fuel pump relay as long as ignition reference pulses are detected. The control module disables the fuel pump relay within two seconds if ignition reference pulses cease to be detected and the ignition remains ON.
Fuel Pump Relay Underhood Electrical Center Terminal Identification | |||
---|---|---|---|
Front of Vehicle | |||
Left Side of Vehicle | Ground | Ignition 1 | Right Side of Vehicle |
Fuel Pump Supply | Control |
The following conditions may have caused the fuel pump fuse to open:
• | The fuse was faulty. |
• | There is an intermittent short in the supply voltage circuit of the fuel pump. |
• | The fuel pump has an internal intermittent condition. |
For an intermittent condition, refer to Intermittent Conditions .
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views | |||
1 | Did you perform the Diagnostic System Check-Engine Controls? | Go to Step 2 | |
2 |
Does the fuel pump turn ON and OFF? | Go to Diagnostic Aids | Go to Step 3 |
3 | Command the fuel pump relay ON and OFF with a scan tool. Do you hear the fuel pump relay click when you command the fuel pump relay ON and OFF? | Go to Step 9 | Go to Step 4 |
4 |
Does the test lamp turn ON and OFF? | Go to Step 5 | Go to Step 6 |
5 |
Does the test lamp turn ON and OFF? | Go to Step 19 | Go to Step 23 |
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 in Wiring Systems. Did you find and correct the condition? | Go to Step 28 | Go to Step 27 |
8 | Test the control circuit of the fuel pump relay for a short to ground and for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 28 | 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 |
Does the fuel pump operate continuously? | Go to Step 22 | Go to Step 26 |
11 | Inspect the F/PMP fuse. Is the fuse open? | Go to Step 12 | Go to Step 14 |
12 |
Did you find and correct the condition? | Go to Step 28 | Go to Step 13 |
13 |
Is the fuse open? | Go to Step 21 | Go to Intermittent Conditions |
14 |
Does the test lamp illuminate? | Go to Step 15 | Go to Step 24 |
15 | Connect a 20-amp fused jumper wire between the ignition 1 voltage circuit of the fuel pump relay 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, between the fuel pump relay and the fuel pump for an open and for high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 28 | Go to Step 17 |
17 |
Important: Inspect the ground circuit for proper torque, corrosion on the terminals, and damage to the wiring harness. Test the ground circuit of the fuel pump for an open and for high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 28 | Go to Step 18 |
18 | Test for an intermittent and for a poor connection at the fuel pump connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 28 | Go to Step 21 |
19 | Test for an intermittent and for a poor connection at the fuel pump relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 28 | Go to Step 26 |
20 | Test for an intermittent and for a poor connection at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 28 | Go to Step 27 |
21 | Test for an intermittent and for a poor connection at the fuel pump connector within the fuel tank. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 28 | Go to Step 25 |
22 | Repair the short to voltage in the supply voltage circuit of the fuel pump. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 28 | -- |
23 | Repair the open or high resistance in the ground circuit of the fuel pump relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 28 | -- |
24 | Repair the open in the ignition 1 voltage circuit of the fuel pump relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 28 | -- |
25 |
Did you complete the replacement? | Go to Step 28 | -- |
26 | Replace the fuel pump relay. Did you complete the replacement? | Go to Step 28 | -- |
27 | Replace the PCM. Refer to Powertrain Control Module Replacement . Did you complete the replacement? | Go to Step 28 | -- |
28 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
The control module enables the fuel pump relay when the ignition switch is turned ON. The control module will disable the fuel pump relay within 2 seconds unless the control module detects ignition reference pulses. The control module continues to enable the fuel pump relay as long as ignition reference pulses are detected. The control module disables the fuel pump relay within 2 seconds if ignition reference pulses cease to be detected and the ignition remains ON.
Fuel Pump Relay Underhood Electrical Center Terminal Identification | |||
---|---|---|---|
Front of Vehicle | |||
Left Side of Vehicle | Ground | Ignition 1 | Right Side of Vehicle |
Fuel Pump Supply | Control |
The following conditions may have caused the fuel pump fuse to open:
• | The fuse was faulty. |
• | There is an intermittent short in the supply voltage circuit of the fuel pump. |
• | The fuel pump has an internal intermittent condition. |
For an intermittent condition, refer to Intermittent Conditions .
Step | Action | Yes | No | ||||
---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views | |||||||
1 | Did you perform the Diagnostic System Check-Engine Controls? | Go to Step 2 | |||||
2 |
Does the fuel pump turn ON and OFF? | Go to Diagnostic Aids | Go to Step 3 | ||||
3 | Command the fuel pump relay ON and OFF with a scan tool. Do you hear the fuel pump relay click when you command the fuel pump relay ON and OFF? | Go to Step 9 | Go to Step 4 | ||||
4 |
Does the test lamp turn ON and OFF? | Go to Step 5 | Go to Step 6 | ||||
5 |
Does the test lamp turn ON and OFF? | Go to Step 21 | Go to Step 25 | ||||
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 in Wiring Systems. Did you find and correct the condition? | Go to Step 30 | Go to Step 29 | ||||
8 | Test the control circuit of the fuel pump relay for a short to ground and for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 30 | Go to Step 22 | ||||
9 | Turn ON the ignition, with the engine OFF. Does the fuel pump operate continuously? | Go to Step 10 | Go to Step 11 | ||||
10 |
Does the fuel pump operate continuously? | Go to Step 24 | Go to Step 28 | ||||
11 | Inspect the F/PMP fuse. Is the fuse open? | Go to Step 12 | Go to Step 15 | ||||
12 |
Did you find and correct the condition? | Go to Step 30 | Go to Step 13 | ||||
13 |
Did you find and correct the condition? | Go to Step 30 | Go to Step 14 | ||||
14 |
Is the fuse open? | Go to Step 23 | Go to Intermittent Conditions | ||||
15 |
Does the test lamp illuminate? | Go to Step 16 | Go to Step 26 | ||||
16 | Connect a 20-amp fused jumper wire between the ignition 1 voltage circuit of the fuel pump relay and the supply voltage circuit of the fuel pump. Does the fuel pump operate? | Go to Step 21 | Go to Step 17 | ||||
17 |
Did you find and correct the condition? | Go to Step 30 | Go to Step 18 | ||||
18 |
Important: Inspect the ground circuit for proper torque, corrosion on the terminals, and damage to the wiring harness. Test the ground circuit of the fuel pump for an open and for high resistance between the fuel pump harness in-line connector and ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 30 | Go to Step 19 | ||||
19 | Test for an intermittent and for a poor connection at the fuel pump harness in-line connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 30 | Go to Step 20 | ||||
20 |
Did you find and correct the condition? | Go to Step 30 | Go to Step 23 | ||||
21 | Test for an intermittent and for a poor connection at the fuel pump relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 30 | Go to Step 28 | ||||
22 | Test for an intermittent and for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 30 | Go to Step 29 | ||||
23 | Test for an intermittent and for a poor connection at the fuel pump connector within the fuel tank. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 30 | Go to Step 27 | ||||
24 | Repair the short to voltage in the supply voltage circuit of the fuel pump. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 30 | -- | ||||
25 | Repair the open or high resistance in the ground circuit of the fuel pump relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 30 | -- | ||||
26 | Repair the open in the ignition 1 voltage circuit of the fuel pump relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 30 | -- | ||||
27 |
Did you complete the replacement? | Go to Step 30 | -- | ||||
28 | Replace the fuel pump relay. Did you complete the replacement? | Go to Step 30 | -- | ||||
29 | Replace the PCM. Refer to Powertrain Control Module Replacement . Did you complete the replacement? | Go to Step 30 | -- | ||||
30 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |