Case IH 3362 – Engine Control Module (ECM / EDC) or Aftertreatment Controller (DCU): Torque to Quantity Map - Not Plausible (FPT) / DEF Dosing Unit Input Lines - Condition Exists (Cummins)

Depending on the engine architecture, this code indicates either a mismatch between requested engine torque and calculated fuel quantity (FPT/CNH engines) or that the DEF dosing unit is unable to prime or deliver DEF to the dosing valve (Cummins engines).

• skid steer
• Magnum
• Puma
• Maxxum
• SSL/CTL
• Steiger tractors
• high-horsepower combines
• large wheel loaders

1. 1

   For FPT/CNH engines: Check for accompanying fault codes related to the Atmospheric Pressure Sensor (e.g., 3363), Foot Pedal sensors (e.g., 3364, 3365), or fuel rail pressure.

2. 2

   For FPT/CNH engines: Test fuel system integrity. Verify that the vacuum between the inlet of the fuel lift pump and the tank does not exceed 2 inches of Hg, and check fuel supply pressures.

3. 3

   For FPT/CNH engines: Check the ECM for software bugs or outdated calibrations that might cause mapping errors.

4. 4

   For Cummins engines: Verify the DEF tank is full and the fluid is not contaminated or frozen.

5. 5

   For Cummins engines: Visually inspect the three DEF lines (between the tank, dosing unit, and dosing valve) for cracks, leaks, blockages, or reversed connections.

6. 6

   For Cummins engines: Disconnect the DEF dosing valve (injector) and check the internal resistance using a multimeter. A healthy valve should read between 11 and 18 ohms.

7. 7

   For Cummins engines: Pull the suction line off the DEF pump and run a pressure/leak test via the diagnostic tool. Check for suction at the inlet port to verify internal pump operation.

1. 1

   Connect diagnostic tool

   For FPT/CNH engines: Connect the CNH Electronic Service Tool (EST) to the machine's diagnostic port.

2. 2

   Address primary sensor faults

   For FPT/CNH engines: Address any primary sensor faults first (such as replacing a faulty accelerator pedal or atmospheric pressure sensor).

3. 3

   Check for software updates

   For FPT/CNH engines: If no other codes are present, check for available ECM software updates or calibration flashes via the EST, as map plausibility errors are frequently resolved with software patches.

4. 4

   Clear codes and test drive

   For FPT/CNH engines: Clear the fault codes and test drive the machine under load to verify the torque map plausibility is restored.

5. 5

   Disconnect DEF dosing valve harness

   For Cummins engines: Turn off the key and disconnect the DEF dosing valve harness.

6. 6

   Replace DEF dosing valve

   For Cummins engines: If the dosing valve failed the resistance test (outside 11-18 ohms), replace the DEF dosing valve.

7. 7

   Replace DEF Dosing Unit

   For Cummins engines: If the valve is good but the pump failed the suction test, remove and replace the DEF Dosing Unit (Pump).

8. 8

   Reconnect lines and harnesses

   For Cummins engines: Reconnect all lines and harnesses. Ensure no lines are kinked.

9. 9

   Clear inactive fault codes

   For Cummins engines: Connect your diagnostic tool (e.g., Cummins INSITE or CNH EST). You must clear the inactive fault codes first, as the ECM may block testing if the derate code is still active.

10. 10

    Run system leak or override test

    For Cummins engines: Run the 'Aftertreatment Diesel Exhaust Fluid System Leak Test' or 'Doser Pump Override Test' to prime the system and validate the repair.

11. 11

    Perform forced DPF regeneration

    For Cummins engines: Perform a forced DPF regeneration to take the engine out of derate.