Case IH 19907 – Engine Control Unit (ECU): Error in comparing energizing time to maximum value for injector in cylinder 1

The ECU detects that the required energizing time for the cylinder 1 injector has exceeded the maximum programmed tolerance. This typically indicates that the injector is worn, clogged, or mechanically failing.

• Tier 4b
• N-Series Loader Backhoes
• Steiger
• Magnum
• Puma
• Axial-Flow series

1. 1

   Check for other active codes related to fuel pressure, battery voltage, or injector short circuits (under/over voltage monitoring errors)

2. 2

   Inspect the wiring harness and connectors leading to the cylinder 1 injector for high resistance, corrosion, or partial shorts

3. 3

   Check fuel filters and fuel water separator to ensure the fuel system is not restricted

4. 4

   Verify adequate fuel supply pressure to rule out fuel starvation

5. 5

   Use the CNH EST / EASy diagnostic tool to perform a cylinder contribution test or injector kill test on cylinder 1

1. 1

   Clear the Code

   Clear the fault code using the diagnostic tool and run the engine at low idle to see if the ZFL monitor resets the code.

2. 2

   Replace the Injector

   If the code returns, the fuel injector for cylinder 1 is outside of its mechanical tolerance and must be replaced.

3. 3

   Program the Trim Code

   After installing the new injector, use the CNH EST diagnostic tool to enter the new injector's trim code (IQA/QR code) into the Engine ECU.

4. 4

   Zero Fuel Calibration

   Run the engine at low idle to allow the ECU to perform a new Zero Fuel Calibration (ZFL) and learn the new injector's energizing time.