Case IH 3628 – Engine Control Unit (ECU) / EDC: Crank case pressure sensor physical range check (below upper limit) low

The Engine Control Unit (ECU) has detected that the crankcase pressure sensor could be defective. Specifically, the sensor is returning a value that is out of its physical range, reading below -0.21 bar (-3.0 psi).

• STX Steiger series
• Quadtrac
• Magnum
• Puma
• Maxxum
• Farmall
• Axial-Flow 6140
• Axial-Flow 7140
• Axial-Flow 7240
• Axial-Flow 8240
• Axial-Flow 9240
• 1021G Wheel Loader
• 1121F Wheel Loader
• 1121G Wheel Loader

1. 1

   Check that the crankcase pressure sensor is properly installed and seated securely in its port

2. 2

   Inspect the wiring harness leading to the sensor for any physical damage, chafing, or breaks

3. 3

   Ensure the 3-pin connector is securely fastened and free of corrosion or debris

1. 1

   Locate sensor

   Locate the crankcase pressure sensor on the engine block.

2. 2

   Perform diagnostic checks

   Perform the diagnostic checks on the installation and wiring harness as outlined in the things to check.

3. 3

   Determine sensor failure

   If the sensor is installed correctly and the wiring harness is verified to be in good condition, the sensor itself has failed internally.

4. 4

   Disconnect connector

   Disconnect the 3-pin electrical connector from the sensor.

5. 5

   Remove sensor

   Remove the defective crankcase pressure sensor.

6. 6

   Install new sensor

   Install the new OEM replacement sensor.

7. 7

   Reconnect and clear codes

   Reconnect the wiring harness and clear the fault codes using an Electronic Service Tool to verify the repair.