Circuit Description
The fuel pump relay supplies power to the fuel pump. When the ignition switch is first turned ON, the PCM energizes the fuel pump relay for approximately 2 seconds. This allows the fuel pump to prime the fuel rail assembly. The fuel pump relay remains ON as long as the PCM receives reference pulses from the ICM (engine is cranking or running). If the PCM does not receive the reference pulses, the PCM de-energizes the fuel pump relay.
Diagnostic Aids
With the engine stopped, the fuel pump can be turned ON by using the scan tool output controls function.
An intermittent may be caused by a poor connection, rubbed through the wire insulation or a wire broken insideof the insulation.
Check for a poor connection or a damaged harness. Inspect the PCM harness and connectors for the following items:
| • | Improper mating |
| • | Broken locks |
| • | Improperly formed or damaged terminals |
| • | Poor terminal to wire connections |
| • | Damaged harnesses |
Test Description
Number(s) below refer to the step number(s) on the diagnostic table:
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic System Check performed? | -- | ||
Is DTC P0230 - Fuel Pump Control Circuit set? | -- | |||
3 |
Is the test light ON? | -- | ||
4 | Check for a blown fuel pump fuse. Is the fuel pump fuse blown? | -- | ||
5 |
Is the test light ON? | -- | ||
6 |
Is the test light ON? | -- | ||
7 |
Is fuel pressure within the specified values? | 333-376 kPa (48-55 psi) | ||
8 |
Is the test light ON? | -- | ||
9 | Connect the test light between the fuel pump feed terminal and chassis ground. Is the test light ON? | -- | ||
10 | Locate and repair the open in the fuel pump feed relay circuit. Refer to Repair Procedures in Wiring Repairs . Is action complete? | -- | -- | |
11 | Locate and repair the short to ground in the fuel pump relay feed circuit. Refer to Repair Procedures in Wiring Repairs . Is action complete? | -- | -- | |
12 | Locate and repair the short to ground in the fuel pump feed (CKT 120). Refer to Repair Procedures in Wiring Repairs . Is action complete? | -- | -- | |
13 |
Is action complete? | -- | ||
14 |
Is action complete? | -- | ||
15 | Locate and repair the open in the fuel pump ground circuit (CKT 350). Refer to Repair Procedures in Wiring Repairs . Is action complete? | -- | -- | |
16 | Locate and repair the open in the fuel pump feed circuit (CKT 120). Refer to Repair Procedures in Wiring Repairs . Is action complete? | -- | -- | |
17 | Replace the fuel pump. Refer to Fuel Sender Assembly Replacement . Is action complete? | -- | -- | |
18 | Replace the fuel pump relay. Refer to Fuel Pump Relay Replacement . Is action complete? | -- | -- | |
19 |
Is fuel pressure within the specified values? | 333-376 kPa (48-55 psi) | System OK |
