0398399 JOHNSON FUEL PUMP ASSY.

Table 1
J1939 Code and Description CDL Code and Description Comment
1076-7
Engine Fuel Injection Pump Fuel Control Valve : Not Responding Properly 18-7
Fuel Control Valve : Not Responding Properly The commanded Fuel Control Valve (FCV) position does not match the actual FCV position.
1076-8
Engine Fuel Injection Pump Fuel Control Valve : Abnormal Frequency, Pulse Width, or Period 18-8
Fuel Control Valve : Abnormal Frequency, Pulse Width, or Period The PWM signal between the Fuel Control Valve (FCV) and the ECM has been lost.
1076-11
Engine Fuel Injection Pump Fuel Control Valve : Other Failure Mode 18-11
Fuel Control Valve : Other Failure Mode A failed Fuel Control Valve (FCV) has been detected.
1076-12
Engine Fuel Injection Pump Fuel Control Valve : Failure 18-12
Fuel Control Valve : Failure A failed Fuel Control Valve (FCV) has been detected.
3597-6
ECU Power Output Supply Voltage #1 : Current Above Normal 1028-6
Power Supply Control 1 : Current Above Normal A failed power supply to the fuel control valve has been detected.
Illustration 1 g06090796
All the electrical connectors may not be shown. Refer to the schematic for more detail.
Note: Refer to Troubleshooting, "Electrical Connectors" for an Illustration of the ECM and Connectors.
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, 18–11, 18–12, 1076–7, 1076–11 or 1076-12 code is present.
Repair: A failed fuel control valve (FCV) has been detected.
Release the pressure in the high-pressure rail by loosening the end plug on one of the last two fuel accumulators. Refer to Testing and Adjusting, "Fuel Rail Pressure - Release" for instructions on how to release the pressurized fuel.
Verify the "Fuel Rail Pressure" reading in ET is 0 8 MPa (0 1160 psi) prior to servicing the fuel system.
Replace the fuel control valve (FCV).
Proceed to Test Step 9.
Result: An 18–8 or 1076-8 code is present.
Proceed to Test Step 2.
Result: A 1028–6 or 3597-6 code is active.
Proceed to Test Step 5.
2. Check the Wiring Between the ECM and the Fuel Control Valve (FCV) for an Open Circuit
A. Remove electrical power from the engine.
B. Disconnect the fuel control valve 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: 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: 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 wiring harness as necessary.
Proceed to Test Step 9.
3. Check the Wiring Between the ECM and the Fuel Control Valve (FCV) for a Short Circuit to Ground
A. Remove electrical power from the engine.
B. Disconnect the fuel control valve from the wiring harness.
C. Disconnect the J-1 ECM connector from the engine ECM.
D. Measure the resistance between pin 11 on the FCV connector and a known good ground.
Short Circuit
Results: There was more than 100 K ohms of resistance between pin 11 on the FCV connector and a known good ground.
Proceed to Test Step 4.
Results: There was less than 100 K ohms of resistance between pin 11 on the FCV connector and a known good ground.
A short circuit to ground in the wiring harness has been detected.
Repair: Repair or replace the wiring harness as necessary.
Proceed to Test Step 9.
4. Check the Wiring Between the ECM and the Fuel Control Valve (FCV) for a Pin to Pin Short Circuit
A. Remove electrical power from the engine.
B. Disconnect the fuel control valve 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 all other pins in the J–1 ECM connector.
Short Circuit
Results: More than 100 K ohms of resistance between pin 38 on the J-1 ECM connector and all other pins in the J-1ECM connector.
Proceed to Test Step 5.
Results: Less than 100 K ohms of resistance between pin 38 on the J–1 ECM connector and all other pins in the J–1 ECM connector.
A pin to pin short circuit in the wiring harness has been detected.
Repair: Repair or replace the wiring harness as necessary.
Proceed to Test Step 9.
5. Check for System Voltage at the fuel control valve connector
A. Remove electrical power from the engine.
B. Disconnect the fuel control valve from the wiring harness.
C. Apply electrical power to the engine.
D. Measure the voltage between pin 8 on the fuel control valve connector and a known good ground.
System Voltage
Result: System voltage was present at pin 8.
The system is working properly.
Verify that the repair resolved the issue. Return to service.
Result: System voltage was NOT present at pin 8.
Proceed to test Step 6.
6. Check for an Open Circuit in the Fuel Control Valve Wiring
A. Remove electrical power from the engine.
B. Disconnect the fuel control valve from the wiring harness.
C. Disconnect the J–1 connector from the ECM.
D. Measure the resistance between pin 8 on the fuel control valve wiring harness connector and pin 48 on the J-1 connector.
Open Circuit
Result: Less than 10 ohms of resistance between the pins.
Proceed to Test Step 7.
Result: More than 10 ohms of resistance between the pins.
An open circuit has been detected.
Repair: Repair or replace the wiring