Iveco 1.2 – Engine Control Unit (ECU) / IVECO EDC MS6.2 SW 5.X Control Unit: LIGHT CONSTANT Torque Switch

Indicates a malfunction, open circuit, or implausible signal in the Alternate Torque Switch circuit. The EDC warning light stays illuminated steadily, which indicates a serious fault that may cause poor system operation or a loss of safety functions.

• Iveco Trakker
• Eurotrakker Cursor 13
• Stralis

1. 1

   Verify the Code: With the key turned off, press the diagnosis button. Count the flashes of the EDC warning light to confirm the 1.2 code (one flash, a short pause, then two flashes).

2. 2

   Inspect Wiring and Connectors: Check the wiring harness and the connector leading to the Alternate Torque Switch on the dash/cabin panel. Look for frayed wires, corrosion, or loose pins.

3. 3

   Test the Switch for Continuity: Using a multimeter, check the resistance across the switch terminals. It should read < 10 Ohms when closed and > 50k Ohms when open.

4. 4

   Check ECU Voltage: Verify that the EDC is sending the correct reference voltage (usually +5V) to the switch circuit.

1. 1

   Disconnect Power

   Disconnect the vehicle's batteries to prevent electrical shorts during repair.

2. 2

   Access the Switch

   Locate the torque switch on the dashboard panel or near the PTO controls. Carefully pry off the surrounding trim or remove the mounting screws to access the rear of the switch.

3. 3

   Remove the Faulty Switch

   Disconnect the electrical connector from the back of the switch. Depress the retaining tabs and push the switch out of its mounting slot.

4. 4

   Install the New Switch

   Snap the replacement switch into the dashboard slot and reconnect the electrical connector.

5. 5

   Restore Power

   Reconnect the vehicle's batteries.

6. 6

   Clear the Fault Code

   To delete the error from the EDC memory: With the key turned off, press and hold the diagnosis button. Keeping the button pressed, turn the ignition key on. Keep the button pressed for 5 seconds. Let go of the button and turn the key off.

7. 7

   Test Operation

   Start the engine and verify that the EDC warning light does not return to a "LIGHT CONSTANT" state. Test the alternate torque/PTO modes to ensure proper operation.