Case IH 213 – Engine Controller (Engine ECU): Oil Temperature Sensor Voltage is too low

The control module is receiving a voltage signal from the engine oil temperature sensor that has dropped below the acceptable minimum threshold (often below 0.29V). This condition is almost always caused by a short to ground in the sensor wiring circuit, a failed sensor that has shorted internally, or a severely corroded connector.

• MX Magnum
• STX Steiger
• Magnum
• Steiger
• Puma
• MX/TG series
• MXM series
• MX series

1. 1

   Inspect the wiring harness between the Engine Controller and the Oil Temperature Sensor for chafed insulation, bare wires touching the engine block, or pinched sections.

2. 2

   Disconnect the sensor and inspect the pins for moisture, oil intrusion, or green corrosion that could bridge the pins and cause a short.

3. 3

   With the key ON and engine OFF, probe the sensor connector to verify a 5V reference voltage on the supply wire. If 0V, the wire is shorted to ground before the sensor or the ECU is not sending the signal.

4. 4

   Use a multimeter to measure the resistance across the sensor's pins. If the resistance reads near zero (continuity), the sensor is internally shorted and must be replaced.

1. 1

   Power Down

   Turn off the machine, remove the key, and disconnect the negative battery cable to prevent electrical spikes.

2. 2

   Locate the Sensor

   Locate the Engine Oil Temperature Sensor. It is typically threaded directly into the engine block near the oil filter housing or main oil gallery.

3. 3

   Disconnect

   Carefully depress the locking tab on the electrical pigtail and disconnect the wiring harness from the sensor.

4. 4

   Remove the Sensor

   Using a deep socket or wrench, unthread the faulty sensor. Have a shop rag ready, as a small amount of engine oil may weep from the port.

5. 5

   Install the New Sensor

   Thread the new OEM sensor into the port by hand to prevent cross-threading. Tighten it to the OEM torque specification (do not over-tighten, as these are often brass fittings that can snap).

6. 6

   Reconnect

   Plug the electrical connector back in, ensuring the locking tab clicks securely into place.

7. 7

   Clear Codes

   Reconnect the battery, turn the ignition on, and use your diagnostic tool/monitor to clear the ENG 213 fault code.

8. 8

   Test

   Start the engine, check for oil leaks at the sensor threads, and verify that the oil temperature reads correctly on the cab display without the code returning.