New Holland NH 3012 – Engine Control Unit (ECU): Air (boost) Temperature Signal - NO SIGNAL

The control module is not receiving a valid voltage reading from the intake manifold/boost temperature sensor. A 'No Signal' or 'Below Range Min' condition typically indicates an open circuit, a disconnected wiring harness, a broken wire, or a completely failed sensor.

• T5 Series
• T5.95
• T5.105
• T5.115
• T8 Series
• TG255
• TG285
• TJ275
• TJ325
• L223
• C237
• E215
• E27B

1. 1

   Visually inspect the boost temperature/intake manifold temperature sensor wiring harness and connector for physical damage, corrosion, or a disconnected plug.

2. 2

   Disconnect the harness connector and check continuity between the sensor plug and the Engine ECU pins to rule out a broken wire or short circuit.

3. 3

   If wiring is intact and a replacement sensor does not clear the code, test the system with a known-good ECU to verify if the original ECU has an internal fault.

1. 1

   Turn off the machine and disconnect the battery to prevent electrical shorts.

   Turn off the machine and disconnect the battery to prevent electrical shorts.

2. 2

   Locate the boost pressure/temperature sensor.

   Depending on the model, it is typically located on the intake manifold, the inlet pipe, or between the inlet duct and the intake throttle valve.

3. 3

   Release the lock control section on the harness connector and pull to disconnect it from the sensor.

   Release the lock control section on the harness connector and pull to disconnect it from the sensor.

4. 4

   Remove any harness clips or heat protectors obstructing access to the sensor.

   Remove any harness clips or heat protectors obstructing access to the sensor.

5. 5

   Unthread and remove the faulty intake manifold temperature sensor from the manifold/pipe.

   Unthread and remove the faulty intake manifold temperature sensor from the manifold/pipe.

6. 6

   Install the new sensor and tighten it to the OEM torque specification.

   Install the new sensor and tighten it to the OEM torque specification.

7. 7

   Reconnect the electrical harness connector, ensuring the lock clicks into place.

   Reconnect the electrical harness connector, ensuring the lock clicks into place.

8. 8

   Reconnect the battery, start the engine, and use the machine's diagnostic display or an electronic service tool (EST) to clear the fault code.

   Reconnect the battery, start the engine, and use the machine's diagnostic display or an electronic service tool (EST) to clear the fault code.