Case IH 517959-04 - DEC – Transmission Control Unit (TCU) or Transmission/Chassis ECM: Transmission A2 Clutch Solenoid Voltage Below Normal

The control module has detected that the electrical voltage on the Transmission A2 clutch solenoid circuit has dropped below the acceptable operating range, which typically indicates a short circuit to ground, a failed solenoid coil, or a severely degraded connection.

• MAGNUM AFS Connect
• Magnum
• Steiger

1. 1

   Inspect the A2 clutch solenoid, the wiring harness, and the hardware for any apparent physical damage, melting, or chafing

2. 2

   Verify that all harness connectors involved in the A2 clutch circuit are clean, secure, and in good condition

3. 3

   Disconnect the solenoid and test the signal circuit wire back to the ECM to check for a short to ground

4. 4

   With the key switch ON, measure the voltage at the solenoid harness connector (from the supply contact to the return contact) to verify the ECM is sending the correct operating voltage

1. 1

   Turn off power

   Turn the machine's disconnect switch and the key start switch to the OFF position before beginning electrical repairs.

2. 2

   Repair wiring

   If the diagnostic tests reveal a short to ground in the wiring harness, repair or replace the damaged section of the harness.

3. 3

   Remove faulty solenoid

   If the wiring and ECM voltage are correct but the solenoid itself is internally shorted, remove the retaining hardware on the transmission control valve block and extract the faulty A2 clutch solenoid.

4. 4

   Install replacement solenoid

   Install the replacement solenoid and torque to the manufacturer's specifications.

5. 5

   Reconnect harness

   Reconnect all harness connectors securely.

6. 6

   Test machine

   Turn the disconnect switch and key start switch ON, start the engine, and run the machine at high idle.

7. 7

   Verify repair

   Check the diagnostic display to determine if the FMI-04 DTC is still active. If the code is inactive, the repair is successful; clear the historical codes and resume machine operation.