John Deere 000105.15 – ECU: High Engine Air Intake Temperature

The Engine Control Unit (ECU) has detected air temperatures in the intake manifold that exceed the normal operating range. This condition can lead to reduced engine power and, in some cases, engine shutdown to prevent damage.

1. 1

   Reduce the engine speed and load

2. 2

   Check the cooling system, including the radiator and charge air cooler, for any debris that may be obstructing airflow and clean as necessary

3. 3

   Inspect the engine air filter to see if it is restricted or clogged, and clean or replace it if needed

4. 4

   Verify that the engine coolant level is adequate

5. 5

   Inspect the Intake Air Temperature (IAT) sensor wiring harness for visible damage, and perform a continuity test to check for shorts or open circuits

6. 6

   Perform a voltage check: With the ignition on and the IAT sensor unplugged, use a multimeter to verify a 5-volt reference signal from the ECU to the connector

7. 7

   Perform a resistance test: With the IAT sensor disconnected, measure resistance across its terminals. It should read 2-3 kilo-ohms at 68-77°F (20-25°C). Apply heat from a heat gun; the resistance should decrease steadily. If it does not, the sensor is faulty

1. 1

   Reduce Load and Clean

   Reduce the engine load and allow the system to cool. Thoroughly clean any debris from the radiator, charge air cooler, and other cooling system components.

2. 2

   Service Air Filter

   If the engine air filter is dirty or clogged, replace it.

3. 3

   Check Coolant

   Top off the engine coolant if the level is low and inspect for any leaks.

4. 4

   Cycle Power

   After performing the initial checks and cleaning, cycle the power to the machine to see if the code clears.

5. 5

   Replace the Intake Air Temperature Sensor

   If the diagnostic tests indicate a faulty sensor, it will need to be replaced. The sensor is typically located in the air intake manifold or near the air filter housing. After replacement, clear the fault codes.

6. 6

   Consult a Dealer

   If the fault code persists after these steps, there may be a more complex issue, and it is recommended to have the machine serviced by a John Deere dealer.