Massey Ferguson E105.03 – Engine Control Unit (ECU): Inlet Manifold Temperature Signal Voltage High

The Engine Control Unit (ECU) has detected a voltage from the inlet manifold temperature sensor that is above the normal operating range. This high voltage reading is typically interpreted by the ECU as an abnormally low temperature, potentially as low as -40°C. Because the ECU uses the intake air temperature to calculate the correct air-to-fuel ratio and ignition timing, this incorrect signal can lead to fuel mixture issues and a potential loss of engine power.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• 5600 Series
• 5700 Series
• 5608–5613
• 5709–5713
• 6000 Series
• 6100 series
• 6200 series
• 6400 series
• 6600 series
• 6170
• 6290
• 6480
• 6616
• 7000 Series
• 7400 series
• 7600 series
• 7614–7626 Tier 4 2012-2015 models
• 7700 series
• 7714–7726
• 8000 Series
• 8100 series
• 8200 series
• 8400 series

1. 1

   Visual Inspection: Check the wiring harness between the intake manifold temperature sensor and the ECU for physical damage, open circuits, or a short to a high-voltage source.

2. 2

   Connector Check: Inspect the sensor and ECU connectors for corrosion, loose pins, or moisture.

3. 3

   Voltage Test: Unplug the sensor. The reference voltage between the signal and ground pins at the harness connector should measure approximately 5V DC.

4. 4

   Resistance Test: Measure the resistance of the temperature sensor itself. The nominal resistance should be approximately 2.5 kΩ at 20°C (68°F) and 0.186 kΩ at 100°C (212°F). If the sensor reads 'open' (infinite resistance) or is vastly out of range, the sensor is defective.

1. 1

   Power Down

   Turn off the ignition and disconnect the battery terminals to prevent sparking or ECU damage.

2. 2

   Locate the Sensor

   Find the intake manifold air temperature sensor, which is installed in the engine's intake tract (typically downstream of the air filter and upstream of the turbocharger or directly on the intake manifold).

3. 3

   Disconnect

   Unplug the electrical connector from the sensor.

4. 4

   Remove

   Unscrew the defective sensor from the intake manifold.

5. 5

   Install

   Thread the new OEM sensor into the manifold and tighten it to the manufacturer's specified torque.

6. 6

   Reconnect

   Plug the electrical harness back into the sensor, ensuring the locking tab clicks into place.

7. 7

   System Reset

   Reconnect the battery. Turn the ignition off for a minimum of 60 seconds, then turn it back on to perform a system reset. Use a diagnostic service tool to clear the inactive fault code from the ECU memory if it does not clear automatically.