New Holland 155 – Engine ECU: Intake Manifold Temperature Level Exceeded Warning Limit

The Engine Control Module (ECM) has detected that the intake manifold air temperature has surpassed the predefined critical warning limit (e.g., greater than 132°C / 270°F for 5 seconds). This indicates a potential overheating condition within the engine's air intake system or improper cooling system function. When triggered, the ECM logs the fault, illuminates the red STOP ENGINE lamp, and initiates protective measures such as reducing engine torque and speed to prevent severe engine damage.

• T6
• T7.165
• T7.170
• T7.175
• T7.185
• T7.190
• T7.200
• T7.210
• T7.225
• T7.230
• T7.245
• T7.260
• T7.270
• TG215
• TG245
• TG275
• TG305
• T8010
• T8020
• T8030
• T8040
• T8050
• T9010
• T9020
• CX Series Combine
• CR Series Combine
• Various wheel loaders and loader backhoes

1. 1

   Verify actual overheating conditions by inspecting the charge air cooler (intercooler) for blockages from dirt, debris, or bent fins, and ensure cooling fans are operational.

2. 2

   On marine engines, verify that the cooling water intake is not blocked or clogged.

3. 3

   Inspect the intake manifold temperature sensor and its electrical connector for signs of corrosion, damage, or loose connections. Clean the connector pins and apply dielectric grease before reconnecting.

4. 4

   Test the sensor's resistance with a multimeter (should read 2.0 to 10 kOhms at 25°C/77°F). Use a heat gun to gently warm the sensor; the resistance should decrease as the temperature rises. If the resistance does not change or is out of the expected range, the sensor is likely faulty.

5. 5

   Check the sensor supply voltage with the key on and sensor disconnected to ensure a 5-volt reference signal from the ECU is present. If the 5V reference is missing, investigate the wiring harness for breaks or a fault with the ECU itself.

6. 6

   Inspect the wiring harness between the sensor and the ECU for rubbing, chafing, heat damage, or short circuits.

1. 1

   Disconnect battery

   Disconnect the negative battery terminal.

2. 2

   Cool engine

   Allow the engine to cool down completely.

3. 3

   Disconnect sensor

   Disconnect the electrical connector from the faulty intake manifold temperature sensor.

4. 4

   Remove sensor

   Unscrew and remove the old sensor from the intake manifold.

5. 5

   Apply sealant

   Apply a small amount of thread sealant to the threads of the new sensor, if recommended.

6. 6

   Install sensor

   Install the new sensor and tighten it to the manufacturer's specified torque.

7. 7

   Reconnect connector

   Reconnect the electrical connector.

8. 8

   Reconnect battery

   Reconnect the negative battery terminal.

9. 9

   Clear codes

   Using a diagnostic tool, clear all fault codes.

10. 10

    Validate repair

    Start the engine and let it idle for at least one minute to allow the ECU to validate the repair and confirm the fault does not return.