Circuit Description
When you turn the ignition switch ON, the ECM will activate the fuel pump relay and run the in-tank fuel pump. The fuel pump operates as long as the engine cranks or runs, and the ECM receives the distributor reference signal.
If there is no reference signal, the ECM shuts OFF the fuel pump within 2 seconds after you turn the ignition ON or the engine stops.
Should the fuel pump relay or the 12 volt relay drive from the ECM fail, the fuel pump will be run through an oil pressure switch back-up circuit.
Conditions for Setting the DTC
The ECM does not see the 12 volts signal at terminal B2 during the 2 seconds that energizes the fuel pump relay.
Action Taken When the DTC Sets
The Malfunction Indicator Lamp (MIL) will illuminate. The system will go Open Loop.
Conditions for Clearing the MIL/DTC
The conditions for the fault are no longer present and 50 ignition cycles have passed with no further faults or the ignition switch is turned OFF and the battery feed voltage is removed for 10 seconds.
Diagnostic Aids
Refer to Intermittent Conditions .
An inoperative fuel pump relay can result in long cranking times, particularly if the engine is cold or the engine oil pressure is low. The extended crank period is caused by the time necessary for the oil pressure to build enough to close the oil pressure switch and turn ON the fuel pump.
Test Description
The numbers below refer to the step numbers on the Diagnostic Table.
-
This step checks to see if DTC was set as result of a hard failure or intermittent condition.
-
This step checks to see if ECM is receiving fuel pump signal.
-
This step checks oil pressure switch circuit.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the On-Board Diagnostic (OBD) System Check? | -- | ||
2 |
Does the pump run after you turn ON the ignition? | 10 seconds | ||
Does DTC 54 set? | 5 seconds | Go to Diagnostic Aids | ||
Does the test lamp turn ON for the specified value? | 10 seconds 2 seconds | |||
5 |
Did you find a problem? | -- | ||
6 | Repair the open fuel pump signal circuit. Is the action complete? | -- | -- | |
7 |
Does the fuel pump operate? | -- | ||
8 |
Does the fuel pump operate? | -- | ||
9 | Replace the fuel pump relay. Refer to Fuel Pump Relay Replacement . Is the action complete? | -- | -- | |
10 |
Did you find a problem? | -- | ||
11 |
Did you find a problem? | -- | ||
12 | Replace the in-tank fuel pump. Refer to Fuel Pump Replacement . Is the action complete? | -- | -- | |
13 |
Is the test lamp ON? | -- | ||
14 | Repair the open in the battery feed circuit. Is the action complete? | -- | -- | |
15 | Connect a test lamp between the battery feed and the fuel pump relay ground circuit. Is the test lamp ON? | -- | ||
16 | Repair the open in the fuel pump relay ground circuit. Is the action complete? | -- | -- | |
17 |
Does the test lamp turn ON for the specified value? | 10 seconds 2 seconds | ||
18 |
Did you find a problem? | -- | ||
19 |
Did you find a problem? | -- | ||
20 |
Did you find problem? | -- | ||
Was the original symptom Engine Cranks But Will Not Run? | -- | |||
22 |
Does the engine continue to run? | -- | ||
23 | Replace the fuel pump oil pressure switch. Refer to Fuel Pump and Engine Oil Pressure Switch Replacement . Is the action complete? | -- | -- | |
24 |
Is the test lamp ON? | -- | ||
25 | Replace the ECM. Refer to Engine Control Module Replacement . Is the action complete? | -- | -- | |
26 |
Did the DTC reset? | -- | ||
27 | Are any DTCs stored which you have not diagnosed? | -- | Go to the Applicable DTC Table | System OK |
