Case IH t32 – Engine Control Unit (ECU) / Engine Management System: Boost Air Pressure Sensor, Open Circuit Or Current Below Normal Range

The control module is receiving a signal from the boost air pressure sensor that is below the minimum expected threshold. This is typically caused by a disconnected sensor, a broken wire (open circuit) in the harness, or an internal failure of the sensor itself.

• MXM
• MXM Series
• MXM 120
• MXM 130
• MXM 140
• MXM 155
• MXM 175
• MXM 190
• Maxxum
• Puma
• Magnum
• Axial-Flow 5130
• Axial-Flow 7120
• Axial-Flow 8240

1. 1

   Visually inspect the wiring harness leading to the boost air pressure (MAP) sensor for any signs of chafing, breaks, or physical damage.

2. 2

   Disconnect the sensor and inspect the electrical connector for corrosion, moisture, or pushed-out pins that could cause an open circuit.

3. 3

   Use a multimeter to verify the sensor's reference voltage and ground at the connector.

4. 4

   Perform a continuity test on the signal wire between the sensor connector and the ECU to confirm or rule out a break in the wiring harness.

1. 1

   Turn off the machine's ignition and disconnect the battery if you need to perform wiring repairs.

2. 2

   If your diagnostic checks revealed a broken wire or a damaged connector, repair the wiring harness or splice in a new connector pigtail.

3. 3

   If the wiring and voltage supply are intact, the sensor itself has likely failed internally. Unbolt and remove the faulty boost air pressure sensor from the intake manifold.

4. 4

   Install the replacement boost air pressure sensor and securely click the electrical connector back into place.

5. 5

   Reconnect the battery, turn the key to the ON position, and clear the stored fault codes.

6. 6

   Start the engine and verify that fault code t32 does not return.