Deutz-Fahr 997 – ECU: High Charge Air Cooler Temperature

The engine control unit (ECU) has detected that the temperature of the air entering the engine cylinders from the turbocharger cooler (intercooler) has surpassed a critical safety limit. To prevent severe engine damage from pre-ignition, detonation, or overheating, the ECU will typically initiate an engine shutdown. This fault is also identified under the J1939 standard as SPN 105, FMI 0.

• TCD 2.9 L4
• TCD 3.6 L4
• TCD 4.1 L4
• TCD 6.1 L6
• TCD 7.8 L6
• 2011 Series
• 2012 Series
• 2013 Series
• 912 Series

1. 1

   Verify if a genuine overheating event is occurring by checking for clogged or dirty charge air cooler (intercooler) fins, airflow obstructions, high ambient temperatures combined with heavy engine load, or a malfunctioning cooling fan system.

2. 2

   Visually inspect the charge air temperature sensor (often combined with the charge air pressure sensor) for any signs of damage, corrosion, or contamination.

3. 3

   Carefully examine the wiring harness and connector leading to the sensor for breaks, chafing, pinched wires, or corrosion on the connector pins.

4. 4

   Using a multimeter, check for a short circuit to ground or a short to the battery in the sensor's wiring, or use a diagnostic tool like Deutz SerDia to read live data and check for fixed extreme values.

5. 5

   Perform a plausibility check by comparing the charge air temperature reading with the ambient air temperature and coolant temperature readings when the engine is cold (values should be similar).

1. 1

   Resolve overheating issues

   If an actual overheating condition is identified, clean the charge air cooler and ensure unobstructed airflow. Repair any issues with the engine's cooling fan.

2. 2

   Repair wiring

   If wiring or connector damage is found, repair or replace the affected section of the harness. Ensure all connections are clean and secure.

3. 3

   Replace charge air temperature sensor

   If diagnostic checks point to a faulty sensor, locate it on the intake manifold after the charge air cooler. Disconnect the electrical connector, carefully unscrew the old sensor, and install the new sensor tightened to the manufacturer's specified torque. Reconnect the wiring.

4. 4

   Clear fault codes

   After the repair, use a diagnostic tool to clear fault code 997 from the ECU's memory.

5. 5

   Verify the repair

   Start the engine and let it run, monitoring the charge air temperature with a diagnostic tool to confirm that it is reading correctly and within the normal operating range.