Case IH 3508 (DTC FAEF) - ECU – Engine Control Unit (ECU): Torque limitation active

This is an informational code indicating that the Engine Control Unit (ECU) has intentionally derated the engine (reduced power and torque) due to emissions compliance issues (SCR/DEF failure) or for engine protection (critical parameter out of range).

• MAXXUM T4E
• 240 Series Axial-Flow Combines (7240, 8240, 9240)
• Steiger
• Magnum
• Optum
• Puma

1. 1

   Check for active root codes in the diagnostic display or CNH Electronic Service Tool to find the primary fault triggering the derate

2. 2

   Verify the DEF/AdBlue tank level and fluid quality, as contaminated or degraded DEF frequently causes emissions derates

3. 3

   Monitor live data on the engine information page to compare intake, inlet, and outlet exhaust temperatures for discrepancies indicating a faulty sensor

4. 4

   Ensure engine coolant and exhaust gas temperatures are within normal operating ranges and the cooling system is functioning properly

1. 1

   Identify the Primary Fault

   Locate the root fault code in the ECU memory that was logged at the exact same time the 3508 torque limitation became active.

2. 2

   Repair the Root Cause

   Follow the specific OEM troubleshooting steps for the primary fault.

3. 3

   Clear Fault Codes

   Once the physical repair is made, clear the inactive codes from the ECU.

4. 4

   Perform System Reset/Regen

   If the derate was caused by the emissions system, perform a stationary regeneration, an SCR inducement reset via the CNH EST laptop, or a high-load run to get the exhaust temperatures above 450°F to prove the system is functioning correctly.