New Holland ENG 399 – Engine Control Module (ECM): Rear Timing current is too high.

The Engine Control Module (ECM) has detected an abnormally high electrical current draw on the circuit for the rear timing actuator/solenoid. This typically points to a direct short to ground in the wiring harness, a shorted internal coil within the pump's stator/ICV, or an internal failure of the ECM.

• TG210
• TG230
• TG255
• TG285
• CR9090
• CX8080
• CX8090

1. 1

   Visually inspect the engine wiring harness between the Engine ECM and the CAPS pump Injection Control Valve (ICV) for chafing, melted insulation, or pinched wires that could cause a short to ground.

2. 2

   Disconnect the harness at the CAPS pump stator and check the pins and connectors for fluid intrusion (diesel fuel or oil) or corrosion.

3. 3

   With the harness disconnected, use a multimeter to measure the resistance across the pins for the rear timing solenoid on the CAPS pump ICV. A dead short (near zero ohms) indicates the internal coil has failed.

4. 4

   With both the ECM and the CAPS pump disconnected, check the rear timing signal wire for continuity to ground to verify if the wiring harness is shorted.

1. 1

   Turn off the ignition key switch and disconnect the machine's battery to prevent electrical arcing or ECM damage.

2. 2

   Disconnect the wiring harness from the CAPS pump stator/ICV.

3. 3

   If the harness is shorted: Repair the damaged section of the wiring harness or replace the engine harness assembly.

4. 4

   If the ICV/Stator is shorted: Replace the Injection Control Valve (stator) assembly.

   On CAPS pumps, this module sits on top of the pump and can often be replaced independently of the entire pump.

5. 5

   If the entire CAPS pump is heavily worn or contaminated: Replace the complete CAPS fuel injection pump assembly.

   Note: When replacing a CAPS pump, it is highly recommended/required by manufacturers to also replace the transient suppressor to protect the new electronics.

6. 6

   Reconnect the wiring harnesses to the pump and ECM.

7. 7

   Reconnect the battery.

8. 8

   Use a diagnostic tool (such as CNH EST) to clear the inactive fault codes.

9. 9

   Start the engine and verify that ENG 399 does not return and that the engine idles and throttles smoothly without shutting down.