New Holland 3967 – ISM-DI: Injector Codes Not Written To ECU Engine

The engine's control unit (ECU) has not been programmed with the specific calibration codes for one or more fuel injectors. Each modern diesel injector has a unique alphanumeric calibration code printed on its body that dictates its precise fuel flow rate and timing characteristics. Failure to write these codes to the ECU prevents proper engine operation and can lead to rough idling, misfires, and reduced engine power.

• L218
• L220
• L230
• C232
• C238
• C245
• C334
• C345
• B110C
• B95C
• L234
• C234
• L160
• L170
• L213
• L215
• L185
• LS185.B
• C185
• L190
• LS190.B

1. 1

   Use the New Holland Electronic Service Tool (EST) to verify that fault code 3967 is active or stored in the ECU's fault memory

2. 2

   Check for recent repairs, such as fuel injector or engine ECU replacements, as this fault typically appears if the coding procedure was missed after a repair

3. 3

   Physically inspect the currently installed injectors to locate the unique calibration code printed on each one and ensure the codes are legible

1. 1

   Connect Diagnostic Tool

   Connect a laptop with the New Holland Electronic Service Tool (EST) software to the machine's diagnostic port via a compatible protocol adapter.

2. 2

   Navigate to Injector Programming

   Within the EST software, navigate to the engine control module section and find the function for injector programming or calibration (usually within ECU configuration or service routines).

3. 3

   Enter Injector Codes

   Carefully and accurately type the alphanumeric calibration code from the body of each new or existing injector into the corresponding cylinder's data field in the software.

4. 4

   Confirm and Write Codes

   After entering all codes, follow the on-screen prompts to confirm and write the data to the ECU. The EST will program the ECU with the new injector information.

5. 5

   Clear Fault Codes

   Once the programming is complete, use the EST to clear all fault codes from the ECU memory.

6. 6

   Verify Repair

   Disconnect the diagnostic tool and start the engine. Let it run to confirm that it is operating smoothly and that the fault code does not reappear.