Massey Ferguson E3361.03 – Engine Control Unit (ECU) / Aftertreatment Control Module (ACM): DEF Injector Voltage Issue

The signal voltage from the Diesel Exhaust Fluid (DEF) dosing injector is out of its normal operating range on the high side, indicating a short circuit to a 12V power source or an internal short within the injector itself.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• 5600 Series
• 4700 Series
• 7600 Series
• 7700 Series
• 5700 SL Series

1. 1

   Turn the ignition OFF, disconnect the DEF dosing unit harness connector, and inspect both connectors for damaged, bent, spread, broken, pushed out, or corroded pins.

2. 2

   Turn the ignition ON (engine OFF) and measure the voltage between the DEF dosing unit connector pin (harness side) and a known good ground. A reading greater than 10V-12V indicates a short-to-voltage in the wiring harness.

3. 3

   Trace the chassis wiring back to the ECU and look for rubbed-through wire insulation touching a power wire or the chassis.

1. 1

   Repair Wiring

   If your diagnostic checks revealed a short to 12V in the harness, repair or replace the damaged section of the wiring harness.

2. 2

   Replace the DEF Injector

   If the wiring harness tests perfectly fine (no shorts to power) and the connectors are clean, the internal solenoid/circuitry of the DEF Dosing Valve has failed and shorted out. You must replace the DEF Injector unit.

3. 3

   Reassembly

   Install the new DEF injector into the exhaust aftertreatment mixer pipe and torque the mounting clamp/bolts to OEM spec. Reconnect the electrical harness and the DEF fluid supply line.

4. 4

   Clear Codes

   Turn the key ON. Connect a diagnostic scan tool (such as JPRO or AGCO EDT) and clear the inactive fault codes.

5. 5

   Verification

   Run a 'DEF Quantity Test' or 'DEF Dosing Valve Test' via the diagnostic tool to ensure the new injector is firing correctly and that the E3361.03 code does not return.