Deutz-Fahr 169 – ECM (EMR3, EMR4): Short Circuit in Injector 6

An electrical anomaly, specifically a short circuit, has been detected in the circuit for the fuel injector on cylinder number 6. The engine's electronic control system logs this fault when it detects improper voltage or resistance in the injector's electrical circuit. This condition can lead to rough idling, reduced engine performance, increased fuel consumption, engine misfires, and may cause the engine to enter a derated limp mode to prevent damage.

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1. 1

   Visually inspect the wiring harness between the ECM and injector 6 for chafing, melting, or pinched wires.

2. 2

   Check electrical connectors at both the injector and the ECM for corrosion, dirt, moisture, or loose/damaged pins.

3. 3

   Test injector resistance using a multimeter (normal reading is typically 11.0-17.0 Ohms; zero indicates a shorted coil, infinite indicates an open circuit).

4. 4

   Test wiring for shorts to ground by checking continuity to chassis ground with the injector and ECM connectors unplugged.

5. 5

   Test wiring for shorts to power by measuring for voltage on the signal wire at the injector connector with the key on.

6. 6

   Test for voltage and pulse from the ECM using a noid light or oscilloscope while cranking the engine.

1. 1

   Repair wiring harness

   If diagnostic checks reveal damage to the wiring harness or connectors, repair or replace the affected sections. Ensure all connections are clean, secure, and free of contamination. Clear the fault codes and re-check if the error persists.

2. 2

   Replace fuel injector

   If the wiring harness is confirmed to be in good condition but the injector's resistance measurement is out of specification (e.g., zero Ohms indicating a shorted coil), replace the fuel injector on cylinder 6.

3. 3

   Test or replace ECM

   If both the wiring and the injector test as good, the problem may lie with the injector driver circuit within the ECM. Seek professional diagnosis or send the ECM for testing.