The ECM detects all of the following conditions:
- The engine has been running more than 60 seconds. This 60 second delay begins once the engine speed is above 0 rpm.
- Fuel pressure is above the trip line in Illustration 1 for two seconds.
- 94-03 Fuel Pressure open/short to +batt is not active.
- 94-04 Fuel Pressure short to ground is not active.
- 94-13 Fuel Pressure calibration required is not active.
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| Illustration 1 | g00872779 |
System Response:
The ECM will log the warning. The ECM will transmit a warning to the display in the cab. The ECM will clear the warning when the fuel pressure decreases below the reset line for five seconds.
- There may be a problem with the fuel system.
- There may be a problem with the fuel pressure sensor.
Test Step 1. Check for Diagnostic Codes.
- Connect ET to the service tool connector.
- Turn the keyswitch to the ON position. The engine should be off.
- Check for any active diagnostic codes or logged diagnostic codes.
Expected Result:
There should be no diagnostic codes that are present.
Results:
- OK - Proceed to Test Step 2.
- Not OK -
Repair: Repair the diagnostic codes that are present. Refer to the appropriate topic in the "Troubleshooting With a Diagnostic Code" section of this manual.Ensure that the repair eliminates the problem.
Stop.
Test Step 2. Perform a Check of the Fuel System.
- Perform a check of the fuel system. Refer to the appropriate topic in Testing and Adjusting for possible causes.
Expected Result:
There are no problems with the fuel system.
Results:
- OK - There may be an intermittent problem.
Repair: Monitor the operation of the engine.Repair the problem.Ensure that the repair eliminates the problem.
Stop.
- Not OK -
Repair: Repair the problem.Ensure that the repair eliminates the problem.
Stop.