Case IH 3011 – Engine Controller / Engine Control Unit (ECU): Intake Manifold Boost Temperature Sensor Circuit - Signal Below Range Min

The Engine Control Unit (ECU) has detected the voltage signal from the Intake Manifold Boost Temperature Sensor has dropped below the minimum acceptable threshold, indicating a short circuit to ground, an internally shorted sensor, or a failure within the engine controller.

• Farmall
• skid steer
• Skid Steer Loaders (SSL)
• Compact Track Loaders (CTL)
• Magnum
• Steiger

1. 1

   Visually inspect the Intake Manifold Boost Temperature Sensor and its electrical connector for physical damage, moisture, corrosion, or pushed-out pins.

2. 2

   Test the wiring harness between the sensor and the Engine Controller for a short circuit to ground.

3. 3

   Perform a sensor disconnect test: disconnect the sensor. If the fault code changes from 3011 to 3010 (Signal Above Range Max), the wiring is intact and the sensor is internally shorted.

4. 4

   Perform a plausibility check using a diagnostic tool: compare the intake air temperature reading with the engine coolant and engine oil temperatures when the machine is completely cold. They should read approximately the same ambient temperature.

1. 1

   Turn off machine and disconnect battery

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

2. 2

   Locate sensor

   Locate the Intake Manifold Boost Temperature Sensor (typically mounted directly on the intake manifold or the boost piping leading from the turbocharger).

3. 3

   Disconnect harness

   Disconnect the electrical harness from the sensor.

4. 4

   Repair or replace wiring harness

   If your diagnostic checks revealed a short to ground in the wiring, repair or replace the affected section of the engine wiring harness.

5. 5

   Remove defective sensor

   If the wiring is good, use the appropriate wrench to unthread and remove the defective temperature sensor.

6. 6

   Install new sensor

   Install the new OEM Intake Manifold Boost Temperature Sensor and tighten it to the manufacturer's torque specifications.

7. 7

   Reconnect harness

   Reconnect the electrical harness to the new sensor, ensuring the locking tab clicks into place.

8. 8

   Reconnect battery and turn ignition on

   Reconnect the battery and turn the ignition on.

9. 9

   Clear fault codes

   Clear the fault codes using an EASy tool or equivalent diagnostic scanner. In some systems, a system restart will restore self-learning parameters if the plausibility check passes.

10. 10

    Replace Engine Controller

    If the fault persists after replacing the sensor and verifying the wiring is 100% intact, replace the Engine Controller as a last resort.