Massey Ferguson 656.14 – Engine Control Unit (ECU): Injector Number 6 Short Circuit (ECU)

This code indicates that the engine controller has detected an abnormal electrical current draw—specifically a short circuit—on the circuit responsible for firing the #6 fuel injector. This can be caused by a short in the wiring harness, a failed injector solenoid/coil, or (rarely) an internal failure of the injector driver inside the control module.

• 4710
• 7724S
• Interim Tier 4 (2012-2015)
• 7722S
• 7722
• 7615
• 7720S
• 7716
• 7718
• 7726
• 7715
• 7616
• 7618
• 4708
• 7619
• 7626
• 7726S
• 7624
• 4707
• 4709
• 7614
• 7718S
• 7620
• 7719
• 7714
• 7716S
• T4 (2015-2021)
• 7622
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 7600 Series
• 7700 Series
• 7700S Series
• 8700 Series
• 8700S Series
• 8S Series

1. 1

   Visual Inspection: Inspect the wiring harness running from the Engine ECU to Injector #6. Look for chafed insulation, melted wires, or pinch points where the wire might be shorting to the engine block (ground) or another wire.

2. 2

   Connector Check: Disconnect the plug at Injector #6. Check for oil/diesel intrusion, moisture, corrosion, or bent pins, which can bridge the connection and cause a short.

3. 3

   Injector Resistance Test: Using a multimeter, measure the resistance across the two pins on Injector #6. Compare this reading to a known good injector on the same engine (e.g., Injector #5). If the resistance is significantly lower or reads as a dead short (0 ohms), the injector coil has failed internally.

4. 4

   Harness Continuity Test: Disconnect the harness from the ECU and the injector. Test the injector signal and return wires for continuity to ground and continuity to each other.

1. 1

   Disconnect Power

   Disconnect the tractor’s negative battery cable to prevent electrical spikes during repair.

2. 2

   Repair Wiring

   If the harness test revealed a short, repair the damaged section of the wiring or replace the injector harness segment.

3. 3

   Replace the Injector

   Thoroughly clean the area around Injector #6 to prevent debris from entering the cylinder. Remove the high-pressure fuel line connecting the common rail to the injector. Remove the injector hold-down clamp/bolt. Carefully extract the injector from the cylinder head. Install the new injector, ensuring a new copper sealing washer is used at the base. Reinstall the hold-down clamp and torque to OEM specifications. Reconnect the high-pressure fuel line.

4. 4

   Reassembly

   Reconnect the electrical connector to the injector and reconnect the battery.

5. 5

   Clear Codes & Code Injector

   Use a diagnostic scan tool to clear the 000656.14 code. Note: Modern Bosch common rail injectors feature a QR code/trim code that must be programmed (coded) into the Engine ECU using a diagnostic tool so the ECU knows the exact flow characteristics of the new injector.

6. 6

   Test Run

   Start the engine, check for fuel leaks around the high-pressure line, and verify the misfire/code does not return.