New Holland ENG 3009 – Engine Controller (Engine ECU / EDC): Coolant Temperature Sensor -(via CAN) No Signal

Communication failure where the engine control system is not receiving any data from the engine coolant temperature sensor. The underlying condition is typically an open circuit, a disconnected sensor, a failed sensor, or a CAN bus communication error preventing the temperature data from reaching the controller.

• T8.275
• T8.300
• TM120
• TM130
• TM140
• TM155
• TM175
• TM190
• T7000 series
• B90B
• B95
• B110B
• B115B
• LB75.B
• LB90.B
• LB110.B
• C185
• C190
• L180
• L190
• L225
• L230
• LM series telehandlers
• medium excavators

1. 1

   Visually inspect the coolant temperature sensor on the engine block or thermostat housing to ensure it is physically connected.

2. 2

   Inspect the 2-pin electrical connector and the wiring harness leading back to the Engine ECU for chafing, corrosion, or broken wires.

3. 3

   Use a multimeter to check the resistance across the sensor's pins. An open circuit (infinite resistance) confirms the sensor has failed internally.

4. 4

   Verify that the ECU is supplying the correct reference voltage to the connector. If voltage is present but the signal is dropping out, check the CAN bus network lines.

1. 1

   Preparation

   Turn off the engine, remove the key, and disconnect the battery to prevent electrical shorts. Allow the engine to cool completely to avoid burns from hot coolant.

2. 2

   Drain Coolant

   Drain a small amount of coolant from the radiator petcock to drop the fluid level below the sensor port, preventing spills.

3. 3

   Remove the Sensor

   Disconnect the 2-pin electrical harness from the coolant temperature sensor. Use a deep socket or wrench to carefully unscrew the faulty sensor from the engine block/thermostat housing.

4. 4

   Install the New Sensor

   Thread the new coolant temperature sensor into the port. (Note: Many of these sensors use a 1/2" x 14 NPTF thread, which seals as it tightens; do not over-torque).

5. 5

   Reconnect

   Plug the electrical connector back into the new sensor, ensuring it clicks securely into place.

6. 6

   Refill and Test

   Refill any lost engine coolant. Reconnect the battery, start the engine, and check for leaks around the new sensor.

7. 7

   Clear Codes

   Use a diagnostic tool or the machine's onboard diagnostic menu to clear the ENG 3009 fault code from the Engine ECU.