Refer to
Circuit Description
When the key is in turned ON, the PCM energizes the fuel pump relay which sends voltage to the lift pump. The lift pump remains ON during the glow plug cycle. If the engine is not started immediately after the glow plug cycle, the PCM shuts the fuel lift pump OFF and waits until the engine starts. Once the engine has started, the PCM continues to energize the fuel lift pump.
Diagnostic Aids
Possible long crank times or a poor performance problem will exist.
Test Description
Number(s) below refer to the step number(s) on the Diagnostic Table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Important: Before clearing DTCs use the scan tool Capture Info to save the Freeze Frame and Failure Records for reference. The control module's data is deleted once the Clear Info function is used. Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | Go to Powertrain OBD System Check | |
Is there fuel coming out of the water drain? | -- | Fuel Lift Pump System OK | ||
3 |
Is the test light ON? | -- | ||
4 |
Is the test light ON? | -- | ||
5 | Repair the open in the fuel lift pump harness feed circuit. Is the action complete? | -- | -- | |
6 | Repair the open in the fuel lift pump harness ground circuit. Is the action complete? | -- | -- | |
7 | Check the fuel lift pump harness connector for a poor connection and repair as necessary. Was a repair performed ? | -- | ||
8 | Replace the fuel lift pump. Refer to Fuel Lift Pump Replacement . Is the action complete? | -- | -- | |
9 | Using the scan tool, command the fuel lift pump ON Does the fuel lift pump operate? | -- | -- |
