Case IH F-654-03 - ECU – Engine Control Unit (ECU): Short circuit error of injector in cylinder 4

The engine computer has detected an electrical short (either high side to ground or low side to battery) in the control circuit for the fuel injector on cylinder #4. When this occurs, the ECM typically disables the solenoid circuit for that injector to prevent damage, which will result in an engine misfire and a loss of power.

• MAGNUM AFS Connect
• 240 Series Axial-Flow Combines (7240, 8240, 9240)
• Austoft 9900 Sugarcane Harvesters
• Austoft A8000 Sugarcane Harvesters
• Austoft A8800 Sugarcane Harvesters
• Steiger series tractors
• Magnum series tractors

1. 1

   Turn the keyswitch to the OFF position before disconnecting any modules

2. 2

   Inspect the main ECM connector and the valve cover pass-through connector for corrosion, loose terminals, or pushed-back pins

3. 3

   Using a multimeter, test the fuel injector circuit for cylinder #4 for a short to ground, a short to battery voltage, or an open circuit in the wiring harness

4. 4

   Check for bank failure codes (e.g., DTC 7216) to determine if the fault is isolated to cylinder 4 or if the entire injector bank is affected by a shared ground or broader harness failure

1. 1

   Harness Repair

   If the multimeter indicates a short circuit in the wiring, repair or replace the affected section of the engine wire harness as required.

2. 2

   Injector Replacement

   If the wiring harness and connectors test good, the short is likely internal to the injector solenoid itself. Remove the valve cover and replace the cylinder #4 electronic unit injector.

3. 3

   Injector Calibration

   If the fuel injector is replaced, the new injector's specific calibration code (a four-digit number stamped on the injector body) must be programmed into the ECM using the dealer diagnostic software (CNH EST). Failing to program the code will result in a 'Check Programmable Parameters' fault.

4. 4

   Clear Codes

   Clear the fault codes. Note that injector circuit failures are often stored as 'Permanent Fault Codes' in the ECU memory and may require a full repair confirmation over several operating cycles to completely clear from the history.