Massey Ferguson E3363.04 – Engine ECU: The DEF Tank Heater Solenoid Valve High Amps

The engine control system has detected that the electrical circuit controlling the DEF tank heater coolant valve has shorted to ground on the high side, causing an abnormally high current draw. This triggers the fault and may result in engine power degradation or derating.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• MF 5608
• MF 5609
• MF 5610
• MF 5611
• MF 5612
• MF 5613
• MF 7614
• MF 7615
• MF 7616
• MF 7618
• MF 7619
• MF 7620
• MF 7622
• MF 7624
• MF 7626

1. 1

   Inspect the wiring harness running from the Engine ECU to the DEF tank heater coolant valve solenoid for chafed insulation, melted wires, or pinch points touching the chassis.

2. 2

   Disconnect the plug at the DEF tank heater solenoid and check for water intrusion, corrosion, or bent pins.

3. 3

   With the battery disconnected and the ECU and solenoid unplugged, use a multimeter to test the high-side signal wire of the solenoid circuit for continuity to ground.

4. 4

   Test the DEF tank heater coolant valve solenoid by measuring the resistance across its terminals and from the high-side terminal to the solenoid body to check for an internal short.

1. 1

   Disconnect Power

   Turn off the ignition and disconnect the negative battery cable to prevent electrical damage.

2. 2

   Access the Valve

   Locate the DEF tank heater coolant valve, which is typically plumbed into the engine coolant lines routing to the DEF tank.

3. 3

   Address Wiring

   If the diagnostic checks revealed a harness short, repair the damaged section of the wire using heat-shrink butt connectors and re-loom the harness, ensuring it is routed away from sharp edges or extreme heat sources.

4. 4

   Replace the Solenoid Valve

   Pinch off the coolant lines leading to and from the valve to minimize coolant loss. Disconnect the electrical connector. Remove the hose clamps and detach the coolant lines from the valve. Unbolt the valve from its mounting bracket. Install the new DEF tank heater coolant valve, reattach the hoses, and secure the clamps.

5. 5

   Reassembly

   Plug the electrical connector back into the new solenoid.

6. 6

   Refill and Bleed

   Top off the engine coolant to replace any lost fluid and bleed the cooling system of air if necessary.

7. 7

   Clear Codes

   Reconnect the battery, turn the key on, and use a compatible diagnostic scan tool (such as Jaltest or AGCO EDT) to clear the E3363.04 / SPN 3363 FMI 4 fault code from the Engine ECU.