Iveco 168 – Engine Control Unit (ECU) / EDC: Injector 1 Control Circuit Malfunction

The engine computer has detected an electrical anomaly in the circuit responsible for firing the fuel injector on Cylinder 1, such as an open circuit, a short to ground, a short to battery voltage, or resistance outside of the expected parameters.

• Iveco Daily
• Iveco Eurocargo
• Iveco Stralis
• Iveco Trakker

1. 1

   Visually inspect the wiring harness and electrical connector at Injector 1 for pushed-out pins, corrosion, or melted wire insulation.

2. 2

   Perform a resistance test on the Injector 1 coil by disconnecting the connector and measuring across the pins, comparing to OEM specifications.

3. 3

   Test the harness for continuity, shorts to ground, and shorts to power between the EDC (Connector A) and the injector.

4. 4

   Check the EDC for burnt internal injector drivers if the wiring and injector test perfectly.

1. 1

   Prep the Vehicle

   Disconnect the negative battery terminal. Remove any engine covers, intake piping, or brackets obstructing access to the fuel rail and injectors.

2. 2

   Disconnect Lines

   Thoroughly clean the area around Injector 1 to prevent dirt from falling into the cylinder. Disconnect the electrical connector, the high-pressure fuel line, and the low-pressure leak-off (return) line.

3. 3

   Remove the Injector

   Remove the injector hold-down clamp/bolt. Carefully extract the injector from the cylinder head. (If it is seized, a specialized slide hammer or hydraulic puller may be required).

4. 4

   Clean the Bore

   Ensure the old copper sealing washer is removed from the bottom of the injector bore. Clean the bore thoroughly.

5. 5

   Install the New Injector

   Fit a new copper crush washer and O-ring to the new injector. Seat the injector into the bore and install the hold-down clamp.

6. 6

   Reassembly

   Torque the hold-down bolt and the high-pressure fuel line fittings to Iveco's exact OEM torque specifications. Reconnect the leak-off line and the electrical connector.

7. 7

   ECU Coding

   Reconnect the battery. Using a compatible diagnostic scan tool, you must program the new injector's IMA code (printed on the top of the new injector) into the EDC.

8. 8

   Test

   Clear the 0168 fault code, prime the fuel system, start the engine, and check for leaks and smooth operation.