New Holland ENG 3289 – Engine Control Unit (ECU) / EDC: Turbo Compound Monitoring - Signal Low

The voltage returning from the Turbo Compound Sensor to the control module has dropped below the minimum acceptable threshold. This typically points to an electrical issue such as a short to ground in the signal circuit, an open circuit in the 5V reference wire, or a completely failed sensor.

• New Holland CR9090 Elevation
• New Holland CR8090
• New Holland CR8080
• New Holland CR7090
• New Holland CR6090 (Tier 4A)
• New Holland FR9000 series
• New Holland FR9040
• New Holland FR600
• New Holland FR850
• New Holland T9050
• New Holland T8.xxx Series

1. 1

   Inspect the wiring harness and connector at the Turbo Compound Sensor for signs of physical damage, melting, moisture, or pushed-out pins.

2. 2

   With the key ON and engine OFF, disconnect the sensor and use a multimeter to verify that the ECU is supplying a +5V reference to the sensor.

3. 3

   Test the signal wire between the sensor connector and the ECU harness for continuity and check for a short to ground (the most common cause of a Signal Low code).

4. 4

   If the wiring is intact, the 5V reference is present, and the ground is good, suspect an internal sensor failure pulling the signal voltage down.

1. 1

   Power Down

   Turn off the machine, remove the key, and disconnect the battery ground cable to protect the engine ECU.

2. 2

   Locate the Sensor

   Locate the Turbo Compound Sensor on the engine, which is mounted near the secondary turbo compound turbine and gear reduction drive assembly.

3. 3

   Harness Repair

   If the diagnostic checks revealed a short to ground or a broken wire in the harness, repair the damaged section of the wiring using OEM-approved heat-shrink connectors, or replace the affected harness pigtail.

4. 4

   Sensor Replacement

   If the wiring tested perfectly, remove the retaining bolt(s) holding the Turbo Compound Sensor in place and extract the sensor.

5. 5

   Install New Sensor

   Insert the new sensor, torque the retaining hardware to OEM specifications, and securely reconnect the electrical harness.

6. 6

   Clear Codes

   Reconnect the battery. Connect the New Holland Electronic Service Tool (EASy tool) to the machine's diagnostic port and clear the inactive ENG 3289 / 14E fault code.

7. 7

   Test Run

   Start the engine and run it up to operating temperature under load to ensure the Turbo Compound system is monitored correctly and the fault code does not return.