Case IH 17411 (F-522002-31) - ECU – Engine Control Unit (ECU): Defective pressure reduction

This condition indicates that the Selective Catalytic Reduction (SCR) system is failing to properly reduce the pressure of the Diesel Exhaust Fluid (DEF / AdBlue). This typically happens during the system's after-run/purge cycle when the DEF supply module (pump) reverses flow to empty the lines and prevent freezing, or it indicates a blockage/valve failure preventing the pressure from dropping.

• VESTRUM CVX
• Magnum 180
• Magnum 190
• Magnum 210
• Magnum 225
• Magnum 235
• Magnum 260
• Magnum 290
• Magnum 325
• Magnum 340
• Magnum 370
• Maxxum 110
• Maxxum 115
• Maxxum 120
• Maxxum 125
• Maxxum 130
• Maxxum 140
• Puma 130
• Puma 145
• Puma 160
• Puma 170
• Puma 185
• Puma 200
• Puma 215
• Steiger 350
• Steiger 400
• Steiger 450
• Steiger 500
• Steiger 550
• Steiger 600
• Farmall 95A
• Farmall 100C
• Farmall 110C
• Combine 5130
• Combine 6130
• Combine 7130
• Combine 7230
• Combine 8230
• Combine 9230
• Patriot 4430
• Titan 3030
• Titan 3530
• Titan 4030
• Titan 4530
• Farmlift 632
• Farmlift 635
• Farmlift 735
• Farmlift 742
• Farmlift 935

1. 1

   Check Battery Voltage: Low battery voltage (SPN 168, FMI 1) is the most common stored code on Case IH tractors and can cause false DEF system faults. Verify the battery and alternator are functioning correctly.

2. 2

   Inspect DEF Filters: Check the DEF inline filter and the DEF line strainer for clogs or crystallization that could restrict flow and trap pressure.

3. 3

   Wiring and Circuit Check: Turn off the ignition switch and inspect the control circuit and wiring harness between the ECU, the DEF supply module, and the DEF dosing valve for shorts, open circuits, or corrosion.

4. 4

   Run a System Test: Use a diagnostic scan tool to run an 'AdBlue/DEF dosing valve control test' or 'AdBlue/DEF metering system control test' to verify if the pump and doser are physically actuating.

1. 1

   Power down ECU

   Turn OFF the ignition switch and wait for the ECU to fully power down (ensure the after-run purge cycle has completely stopped).

2. 2

   Locate DEF Supply Module

   Locate the DEF Supply Module (pump). Depending on the machine architecture, it may be tank-mounted or mounted remotely on the frame rail.

3. 3

   Disconnect electrical harness

   Disconnect the electrical harness connectors from the DEF supply module.

4. 4

   Disconnect DEF fluid lines

   Carefully disconnect the DEF fluid lines. Note: Be prepared for minor fluid spillage; clean any spilled DEF immediately with warm water to prevent corrosive crystallization.

5. 5

   Remove defective module

   Unbolt the module from its mounting bracket and remove the defective unit.

6. 6

   Install new module

   Install the new DEF supply module and securely bolt it to the bracket.

7. 7

   Reconnect lines and harness

   Reconnect the DEF fluid lines and the electrical harness.

8. 8

   Replace filters

   Replace the DEF inline filter and line strainer as preventative maintenance to protect the new pump.

9. 9

   Turn on ignition

   Turn ON the ignition switch without starting the engine.

10. 10

    Clear codes and test

    Connect a diagnostic scan tool, clear the DTC 17411 (F-522002-31), and run a system test to ensure the code does not return.