Case IH 19234 – Engine Control Unit (ECU / ECM): High pressure intercooler outlet temperature is too high.

The engine control system has detected that the temperature of the charge air exiting the high-pressure intercooler has exceeded the maximum allowable threshold, indicating a loss of cooling efficiency, restricted airflow, a failing cooling fan, or a faulty temperature sensor.

• Tier 4b
• Puma
• Optum
• Magnum
• Axial-Flow 240 Series
• 7240
• 8240
• 9240
• 2300 series

1. 1

   Inspect the exterior of the intercooler and radiator for blockages caused by dirt, chaff, or debris (restricted airflow is the most common cause).

2. 2

   Verify that the viscous drive or variable-pitch engine cooling fan is engaging properly when engine temperatures rise.

3. 3

   Inspect the wiring harness leading to the intercooler outlet temperature sensor for chafing, corrosion, or short circuits.

4. 4

   Using the CNH Electronic Service Tool (EST), check the live data for the intercooler outlet temperature when the engine is completely cold. It should match ambient air temperature; if it reads artificially high, the sensor is faulty.

5. 5

   Check the charge air piping for internal blockages or collapsed hoses under boost.

1. 1

   Clean the Cooling Package

   Even if the sensor is faulty, thoroughly blow out the radiator, intercooler, and oil cooler fins with compressed air to ensure baseline cooling efficiency.

2. 2

   Locate the Sensor

   Locate the air-to-air temperature sensor on the intake piping just after the intercooler outlet (before the intake manifold).

3. 3

   Disconnect the Harness

   Carefully unplug the electrical connector from the sensor.

4. 4

   Remove the Sensor

   Unthread the faulty sensor from the charge air pipe/manifold.

5. 5

   Install the New Sensor

   Thread the new OEM sensor into the port. Torque to the manufacturer's specification (do not over-tighten).

6. 6

   Reconnect and Clear Codes

   Reconnect the wiring harness. Turn the key on and use the CNH EST to clear the inactive fault codes.

7. 7

   Test Run

   Run the machine under a heavy load to ensure the intercooler outlet temperature remains within the normal operating range and the code does not return.