Massey Ferguson E105.04 – ECU (Engine Control Unit): Inlet Manifold Temperature Signal Voltage Low

The control module is receiving a voltage signal from the Inlet Manifold Temperature Sensor (also known as the Manifold Air Temperature Sensor) that is below the normal operating range. This typically indicates a short to ground in the sensor circuit, a damaged wiring harness, or an internally failed sensor.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• 7714 through 7726S
• 8600 series
• 8727S
• 8730S
• 8735S
• 8737S
• 8740S
• 4607M-4610M
• 4707
• 4708
• 4709
• 4710
• 5460-5480
• 5608-5613
• 5710-5713SL
• 6711R
• 6712R
• 6713R

1. 1

   Locate the Inlet Manifold Temperature Sensor on the intake manifold. Inspect the wiring harness and the electrical connector for physical damage, rubbing, or corrosion.

2. 2

   Check for shorts to ground by disconnecting the sensor. If the diagnostic tool now reads a 'Voltage High' code (such as E105.03), the wiring harness is likely intact, and the sensor itself is internally shorted and needs replacement.

3. 3

   Measure the resistance across the sensor's terminals to see if it is out of specification (open or shorted).

1. 1

   Locate the sensor

   Find the manifold temperature sensor on the surface of the engine's intake manifold. It will be a screw-in type sensor with an electrical connector.

2. 2

   Disconnect the harness

   Press the locking tab on the electrical connector and firmly pull it off the sensor. Move the harness safely out of the way.

3. 3

   Remove the old sensor

   Use an open-ended wrench to loosen the sensor. Once loose, finish unscrewing it by hand.

4. 4

   Prepare the new sensor

   If the new sensor does not have pre-applied thread sealant, wrap the threads with thread tape. Wrap in a counterclockwise direction (no more than 2 layers) so the tape doesn't bunch up when threading it in clockwise.

5. 5

   Install the new sensor

   Hand-thread the new sensor into the intake manifold to ensure you do not cross-thread it (especially important as many manifolds are aluminum or plastic). Tighten it the rest of the way with a wrench.

6. 6

   Reconnect and clear

   Plug the electrical connector back in until it clicks. Turn the key on and use a diagnostic tool to clear the E105.04 fault code, or start the tractor to verify the code goes inactive.