New Holland 150-12 – ECU: Injector Cylinder 2 Failure - Bad Intelligent Device or Component

The Engine Control Unit (ECU) has detected an internal error or an unidentifiable failure within the electronic fuel injector for cylinder number 2. The injector, acting as an intelligent device, has reported a general malfunction that does not correspond to a specific failure mode like a short or open circuit. This condition indicates a problem with the component itself and can lead to engine misfires, rough operation, and excessive smoke.

• T6 Series
• T7 Series
• TM Series
• TM120
• TM130
• TM140
• TM150
• TM155
• TM165
• TM175
• TM190

1. 1

   Visually inspect the wiring harness and connector at the cylinder 2 injector for chafing, melting, corrosion, or loose terminals

2. 2

   Disconnect and reconnect the injector connector to ensure it is seated properly and rule out a poor connection

3. 3

   Perform a harness continuity test using a multimeter between the ECU and the injector connector (with ignition off and connectors disconnected) to check for open circuits

4. 4

   Perform a short circuit test by measuring resistance between each wire in the injector harness and chassis ground, and between the two wires themselves (there should be no continuity)

5. 5

   For solenoid-type injectors, measure the resistance across the two pins of the injector and compare to manufacturer specifications or other cylinders (Note: Do not perform this on piezo-style injectors)

6. 6

   Perform a swap test by exchanging the cylinder 2 injector with another cylinder (e.g., cylinder 1). Clear codes and run the engine; if the fault moves to the new cylinder, the injector is faulty. If 150-12 returns, the issue is likely in the wiring or ECU

1. 1

   Depressurize fuel system

   Relieve the pressure in the high-pressure fuel system and disconnect the battery before starting any work.

2. 2

   Clean work area

   Thoroughly clean the area around the fuel rail and the injector to prevent contamination from entering the fuel system or the engine.

3. 3

   Remove obstructions

   Remove any covers, brackets, or air intake piping obstructing access to the fuel injector.

4. 4

   Disconnect fuel lines

   Carefully disconnect the high-pressure fuel line and low-pressure leak-off lines. Cap all open lines and ports immediately to prevent contamination.

5. 5

   Disconnect electrical connector

   Unplug the electrical connector from the top of the injector.

6. 6

   Remove injector

   Remove the hold-down bolt(s) and clamp securing the injector. Gently extract the injector, using a specialized removal tool if seized.

7. 7

   Install new injector

   Ensure the injector bore is clean. Install the new injector with a new copper washer and any required seals.

8. 8

   Reassemble components

   Torque the hold-down bolt(s) and high-pressure line nut to manufacturer specifications. Reconnect the fuel lines and electrical connector.

9. 9

   Program ECU

   If required, program the new injector's calibration code into the ECU using a diagnostic tool to ensure precise fuel delivery.

10. 10

    Finalize repair

    Reinstall all removed components, reconnect the battery, prime the fuel system, start the engine to check for leaks, and clear all fault codes.