VALVE GP-FUEL INJECTION 3N6414 - Caterpillar

Illustration 3 g03834424
Fuel rail pressure sensor
(1) 5 VDC Supply
(3) Ground
Illustration 4 g03834769
Typical example of an engine pressure sensor
(2) Ground
(3) 5 VDC Supply
Illustration 5 g03826056
Connector for the NRS valve
(2) +5 VDC
(3) Ground
Illustration 6 g03826026
Connector for the intake throttle valve (if equipped)
(3) Ground
(5) +5 VDCComplete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps Values Results
1. Determine the Code
A. Connect the electronic service tool to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Turn the keyswitch to the ON position.
C. Determine if a diagnostic trouble code is present.
Diagnostic Codes
Result: A -3 or -4 code is present.
Note which sensor supply has the active diagnostic code.
Proceed to Test Step 2.
2. Check for a Failed Sensor
A. Connect to the electronic service tool.
B. Turn the keyswitch to the ON position.
C. Disconnect a sensor on the suspect sensor supply circuit.
D. Monitor the electronic service tool while the sensor is disconnected to see if the active code changes to logged.
E. Connect the suspect sensor to the wiring harness
F. Repeat steps C through E for each sensor on the suspect sensor supply.
Failed Sensor
Result: The suspect sensor supply active code changes to logged when a sensor is unplugged.
Repair: Replace the failed sensor.
Verify that the repair resolved the fault.
Result: The suspect sensor supply active code remains active after all sensors on the sensor supply circuit have been checked.
Proceed to Test Step 3.
3. Check the Wiring for an Open Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect all sensors on the suspect 5 VDC supply circuit.
C. Disconnect the engine interface connector.
D. Disconnect the J1 and J2 connector from the ECM, as applicable.
5 VDC Supply Circuit 1
E. Measure the following resistances:
Pin 1 on the fuel rail pressure sensor harness connector to pin 27 on