Iveco 166 – EDC (Electronic Diesel Control): Defective injector control circuit 6

The engine control module has detected an electrical anomaly—such as an open circuit, a short to ground, or a short to battery voltage—in the wiring circuit or the solenoid of the fuel injector for cylinder #6.

• Eurocargo
• Stralis
• Trakker
• Steiger

1. 1

   Scan for accompanying fault codes. If codes for multiple injectors (e.g., 0161, 0162, 0163) are present, the issue is likely a shared ground wire, a damaged main engine harness, or a failing EDC module.

2. 2

   Inspect the wiring harness running from the EDC to injector #6 for chafed wires, melted insulation, or oil intrusion in the connectors.

3. 3

   Disconnect the EDC harness and the injector #6 connector. Use a multimeter to test the wires for continuity, and ensure there is no short to ground or short to voltage.

4. 4

   Measure the resistance across the pins of injector #6 and compare it to a known good injector (e.g., injector #5). If the resistance is out of specification, the injector has failed internally.

1. 1

   Disconnect Power

   Disconnect the negative battery terminal to prevent electrical spikes from damaging the EDC during repair.

2. 2

   Access the Injector

   Remove the valve cover or injector acoustic cover to access cylinder #6 (the rearmost cylinder on the engine block).

3. 3

   Repair Wiring

   If the diagnostic tests revealed a broken or shorted wire, repair the harness using OEM-approved waterproof splices, or replace the injector harness section.

4. 4

   Remove the Faulty Injector

   Clean the area around the injector thoroughly to prevent dirt from falling into the cylinder. Disconnect the electrical connector, remove the high-pressure fuel line connecting the fuel rail to the injector, remove the injector hold-down clamp/bolt, and carefully extract the injector.

5. 5

   Install the New Injector

   Ensure the old copper sealing washer is removed from the cylinder head. Install a new copper washer on the new injector and seat it into the bore. Install the hold-down clamp and torque the bolt to OEM specifications. Reinstall the high-pressure fuel line and torque to spec.

6. 6

   Reassembly & Coding

   Reconnect the electrical connector and the battery. Using a compatible diagnostic scan tool, program the new injector's IMA (Injector Quantity Adjustment) code into the EDC so the module can adjust fueling properly.

7. 7

   Clear & Test

   Clear the 0166 fault code from the EDC memory and run the engine to verify the repair. Check for fuel leaks around the high-pressure line.