Case IH 57 – Transmission / Power Shuttle ECM, Electronic Draft Control (EDC) Module, or Autopilot / Steering System: FNR Lever Reverse Switch Short, EDC Microprocessor Failure, or Steering Angle Out of Bounds

Depending on the specific control module logging the code, this indicates a Power Shuttle FNR lever reverse position switch short to 5 or 12 volts, an internal fatal error within the EDC module's logic board, or the steering sensor reading outside of its calibrated parameters.

• MX Maxxum
• Case IH MXM Series
• Case IH Steiger Series
• Case IH / New Holland TN Series Tractors
• Case IH Magnum Series (MX210, MX230, MX255, MX285)

1. 1

   For Transmission FNR Lever Code: Access the Transmission ECM and locate Connector 2.

2. 2

   For Transmission FNR Lever Code: Use a multimeter to check the voltage at ECM connector 2, pin 27. The fault triggers if voltage is above 4.2 volts.

3. 3

   For Transmission FNR Lever Code: Inspect the wiring harness for a short to 12 volts between ECM connector 2, pin 20 and the Power Shuttle FNR Lever Reverse Position Switch.

4. 4

   For Transmission FNR Lever Code: Check for a short to 5V across the switch terminals themselves.

5. 5

   For Transmission FNR Lever Code: Check for a short to 5V or 12V between the PS FNR Lever Reverse Position Switch and ECM connector 2.

6. 6

   For EDC Code 57 (Microprocessor Failure): Verify stable battery and alternator voltage, as voltage spikes can cause false microprocessor faults.

7. 7

   For EDC Code 57 (Microprocessor Failure): If voltage is stable and the code persists after a key cycle, the module has failed internally.

1. 1

   Disconnect battery

   For Transmission FNR Switch Short: Disconnect the battery to prevent further electrical damage.

2. 2

   Isolate wiring harness

   For Transmission FNR Switch Short: Isolate the section of the wiring harness between the FNR lever and the Transmission ECM.

3. 3

   Repair wiring

   For Transmission FNR Switch Short: Repair any chafed or melted wires causing the short to 5V/12V.

4. 4

   Replace FNR lever assembly

   For Transmission FNR Switch Short: If the wiring tests good but the short is present across the switch terminals, remove the steering column trim and replace the FNR (Forward/Neutral/Reverse) lever assembly.

5. 5

   Verify repair

   For Transmission FNR Switch Short: Reconnect the battery, cycle the key, and verify the shuttle shifts into reverse without triggering the alarm/code.

6. 6

   Disconnect battery

   For EDC Microprocessor Failure: Disconnect the battery.

7. 7

   Remove EDC module

   For EDC Microprocessor Failure: Remove the faulty EDC control module.

8. 8

   Install replacement EDC module

   For EDC Microprocessor Failure: Install a replacement EDC module.

9. 9

   Perform calibration

   For EDC Microprocessor Failure: Perform the self-configuration/calibration routine (the ECM conducts a self-configuration at the next start-up when a different ECM is installed).