INJECTOR GP-FUEL 5267897 - Caterpillar

Illustration 1 g06334895
Schematic of the PWM signal (primary throttle control) for the high-pressure fuel pump
Illustration 2 g06334898
Schematic of the PWM signal (secondary throttle control) for the high-pressure fuel pump
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Apply electrical power to the engine.
B. Connect Cat® Electronic Technician (ET) to the service tool connector.
C. Determine if a code is active or logged.
Codes
Result: An 18–7, code is present.
Repair: An FCV has been detected.
Note: If the pressure is not less than 5000 kPa (725 psi) (gauge) after 10 minutes, vent the pressure from the fuel system. Refer to Systems Operation/Testing and Adjusting, Fuel Rail Pressure - Release, for information.
Replace the FCV.
Proceed to Test Step 9.
Result: An 18–8 code is present.
Proceed to Test Step 2.
Result: A 1028–6 code is active.
Proceed to Test Step 5.
2. Check the Wiring Between the ECM and the FCV for an Open Circuit
A. Remove electrical power from the engine.
B. Disconnect the FCV from the wiring harness.
C. Disconnect the J-1 ECM connector from the engine ECM.
D. Measure the resistance between pin-38 on the J-1 ECM connector and pin 11 on the FCV connector.
Open Circuit
Results: There were less than 10 ohms of resistance between pin-38 on the J-1 engine ECM connector and pin 11 on the FCV connector.
Proceed to Test Step 3.
Results: There were more than 10 ohms of resistance between pin-38 on the J-1 engine ECM connector and pin-11 on the FCV connector.
An open circuit in the wiring harness has been detected.
Repair: Repair or replace the