New Holland NH 3007 – Engine Control Module (ECM / Engine ECU): Coolant Temperature Signal - SOURCE HIGH

The engine control module is receiving a signal voltage from the Engine Coolant Temperature Sender that is outside the maximum allowable limit (typically reading less than 4.8 volts or shorted to ground).

• L180
• L185
• L190
• L213
• L216
• L218
• L220
• L223
• L225
• L230
• C185
• C190
• C227
• C232
• C238
• T4
• T5
• T5.95
• T5.105
• T5.115
• T6
• T7
• T7.220
• T7.270
• T8
• T8.275
• T8.300
• T9
• TM Series
• TS Series
• B90B
• B95
• B110
• B110B
• B115
• B115B
• LB75.B
• LB90.B
• W50C through W300C
• LM series

1. 1

   Verify the code using an Electronic Service Tool to check if the fault is active, then clear it and run the machine to see if it returns.

2. 2

   Inspect the wiring harness between the Coolant Temperature Sender and the ECM (e.g., ECM connector X-016, pins 57 and 58) for chafed wires, a short to the positive battery terminal, or an open circuit.

3. 3

   Check the sensor connectors to ensure they are free of corrosion, moisture, and bent pins.

4. 4

   Test the sensor itself; if wiring and connectors are in good condition and the signal voltage remains out of range, the sensor has failed internally.

1. 1

   Prep the Machine

   Park the machine on a level surface, turn off the engine, and disconnect the negative battery cable to prevent electrical shorts. Allow the engine to cool completely.

2. 2

   Locate the Sensor

   Locate the Engine Coolant Temperature Sender, which is threaded directly into the engine cylinder head or the thermostat housing manifold.

3. 3

   Disconnect the Sensor

   Unplug the 2-pin electrical connector from the sensor.

4. 4

   Remove the Faulty Sensor

   Place a catch pan under the engine to catch any escaping coolant. Use a wrench to unthread and remove the faulty sensor.

5. 5

   Install the New Sensor

   Thread the new OEM coolant temperature sensor into the housing. (Note: Check if the new sensor requires thread sealant; many brass NPTF sensors come with pre-applied sealant). Tighten to the manufacturer's torque specification.

6. 6

   Reconnect

   Plug the electrical connector back into the new sensor.

7. 7

   Refill Coolant

   Top off the engine coolant reservoir to replace any fluid lost during the swap.

8. 8

   Test

   Reconnect the battery, start the engine, and monitor the dashboard gauge. Use a diagnostic tool to clear the NH 3007 code and verify it does not return.