0333312 JOHNSON ORIFICE, Intermediate, No.30

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 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 FCV and the ECM has been lost.
1076-12
Engine Fuel Injection Pump Fuel Control Valve : Failure 18–12
Fuel Control Valve : Failure A failed 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 FCV has been detected.
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 wiring harness as necessary.
Proceed to Test Step 9.
3. Check the Wiring Between the ECM and the FCV for a Short Circuit to Ground
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-11 on the FCV connector and a known good ground.
Short Circuit
Results: There were 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 were 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 FCV for a Pin to Pin Short 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 all other pins in the J–1 ECM connector.
Short Circuit
Results: There were 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: There were 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 FCV connector
A. Remove electrical power from the engine.
B. Disconnect the FCV from the wiring harness.
C. Apply electrical power to the engine.
D. Measure the voltage between pin-8 on the FCV connector and a known good ground.
System Voltage
Result: System voltage was present at pin 8.
The system is working properly.
Result: System voltage was NOT present at pin 8.
Proceed to test Step 6.
6. Check for an Open Circuit in the FCV 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: There were less than 10 ohms of resistance between the pins.
Proceed to Test Step 7.
Result: There were more than 10 ohms of resistance between the pins.
An open circuit has been detected.
Repair: Repair or replace the wiring harness as necessary.
If the problem is not resolved, proceed to Test Step 7.
7. Check for a Short Circuit in the FCV Wiring
A. Remove electrical power from the engine.
B. Disconnect the FCV from the wiring harness.
C. Disconnect the J-1 connector from the ECM.
D. Measure the resistance between pin-8 on the FCV wiring harness connector and a known good ground.
Short Circuit
Result: More than 100 K ohms of resistance between pin-8 and a known good ground.
Proceed to Test Step 8.
Result: Less than 100 K ohms of resistance between pin-8 and a known good ground.
A short circuit has been detected.
Repair: Repair or replace the wiring harness as necessary.
If the problem is not resolved, proceed to Test Step 8.
8. Check for a Pin to Pin Short Circuit in the FCV Wiring
A. Remove electrical power from the engine.
B. Disconnect the FCV from the wiring harness.
C. Disconnect the J-1 connector from the ECM.
D. Measure the resistance between pin-48 on the J-1 ECM connector and all other pins on the connector.
Short Circuit
Result: More than 100 K ohms of resistance between pin-48 on the J-1 connector and all other pins on the