John Deere 2790.16 – Engine Control Unit (ECU): Calculated Compressor Outlet Temperature Moderately High

Because there is no physical temperature sender located at the turbocharger compressor outlet, the control module calculates this temperature using data from other engine sensors. The code triggers when this calculated temperature exceeds the moderate threshold, indicating a potential issue with the turbocharger system (like over-boosting), a clog in the intercooler/Charge Air Cooler (CAC), inefficient engine cooling, or excessive engine load. The ECU will usually respond by limiting engine power to protect components.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6230
• 6330
• 6430
• 7630
• 7730
• 7830
• 7930
• 8370R
• 9430
• 9530
• 9630
• 9660 STS
• 9770 STS
• 7760 Cotton Picker

1. 1

   Check for other active error codes related to the MAP sensor, EGR valve (e.g., 002791 series), or Variable Geometry Turbo (VGT) control (e.g., 002795 series)

2. 2

   Inspect the Charge Air Cooler (intercooler) and radiator for external blockages (chaff, dirt, debris) that could impede cooling efficiency

3. 3

   Check intercooler piping and hoses for boost leaks or internal blockages

4. 4

   Evaluate turbocharger operation to ensure the VGT is not over-spinning or creating excessive boost pressure

5. 5

   Monitor engine loads to ensure the machine is not being consistently lugged in a high-load state

1. 1

   Resolve Sensor Faults

   If MAP, MAT, or VGT actuator codes are present, diagnose and repair those circuits first, as they directly feed the ECU's temperature calculation.

2. 2

   Clean the Cooling Package

   Thoroughly blow out the radiator, intercooler, and condenser fins with compressed air to restore proper airflow.

3. 3

   Repair Intake/Boost Leaks

   Tighten all clamps and replace any torn silicone boots on the charge air piping.

4. 4

   Test the VGT Actuator

   If the turbo is over-boosting, use a diagnostic tool (like John Deere Service ADVISOR) to command the VGT actuator. If the actuator fails to reach its expected position or fails the calibration cycle, replace the VGT actuator or the turbocharger assembly.

5. 5

   Reset and Road Test

   After inspecting and addressing the root cause, clear the codes and reset the ECU. Operate the machine under normal load to ensure the calculated temperature remains within the specified range.