Case IH 19918 – Engine Control Unit (ECU): Error in comparing energizing time to minimum value for injector in cylinder 5

The cylinder 5 fuel injector is mechanically defective, leaking, or stuck open. This is detected during a Zero Fuel Calibration (ZFC) check when the injector requires an energizing time that falls below the minimum allowable limit to achieve the expected crankshaft acceleration, indicating it is flowing too much fuel.

• Tier 4b
• Case IH Steiger series
• Case IH Magnum series
• Case IH Puma / Optum series

1. 1

   Run the engine in a standard warm low-idle condition with all parasitic loads turned off (no A/C, all lamps off, no additional hydraulic/auxiliary loads)

2. 2

   Use the CNH Electronic Service Tool (EST) to monitor the injection quantity and cylinder balance rates

3. 3

   Evaluate the data to see if the injection quantity for cylinder 5 is reading below the minimum threshold and the failure is still actively detected

1. 1

   Preparation

   Clean the area around the valve/rocker cover thoroughly to prevent dirt from entering the engine.

2. 2

   Access the Injector

   Remove the valve cover/rocker cover to access the fuel injectors.

3. 3

   Removal

   Disconnect the electrical connector and the high-pressure fuel line to the cylinder 5 injector. Remove the injector hold-down clamp.

4. 4

   Extract the Injector

   Pull the injector straight up. If the injector is seized by carbon buildup, a specialized slide-hammer puller tool may be required to extract it.

5. 5

   Clean the Cup

   Thoroughly clean the injector sleeve/cup in the cylinder head, ensuring no carbon debris or old copper washers are left behind.

6. 6

   Installation

   Install the new injector equipped with a new copper sealing washer and new O-rings.

7. 7

   Reassembly

   Reinstall the hold-down clamp and torque to OEM specifications. Reconnect the high-pressure fuel line and electrical harness. Reinstall the valve cover with a new gasket.

8. 8

   ECU Programming

   You must use the CNH EST laptop to enter the new injector's IQA/QR calibration code into the Engine ECU. This tells the ECU the exact flow characteristics of the new injector so it can fuel the cylinder accurately.