Case IH F61 – Transmission Controller / Processor: Upshift Switch Input Voltage High

The controller is detecting that the voltage signal from the upshift switch is higher than the expected normal operating range. The upshift switch will not function, meaning the operator will be unable to select higher gears.

• MXM
• MXM 120
• MXM 130
• MXM 140
• MXM 155
• MXM 175
• MXM 190
• Maxxum 110 Multicontroller
• Puma 140
• MX Series
• TG Series

1. 1

   Key off the tractor and restart the engine to see if default gears (B1/R1) can be selected.

2. 2

   Disconnect the transmission processor connectors (C100 and C101).

3. 3

   Disconnect connector C103 at the upshift/downshift/range shift assembly.

4. 4

   Using a multimeter, check the continuity and voltage on the circuit between processor pin 100-32 and the switch connector C103-CM7210-S/LG/B.

5. 5

   Test the circuit specifically for an open circuit, faulty wiring, or a short to earth (ground).

1. 1

   Trace and Repair Wiring

   Based on the multimeter results, trace the wiring harness between the transmission processor and the shift assembly. Repair any broken wires, chafing, or corroded pins at connectors C100, C101, or C103.

2. 2

   Replace the Switch

   If the wiring harness tests perfectly (no open circuits or shorts to ground), the fault lies internally within the upshift switch mechanism itself. Replace the upshift/downshift/range shift assembly.

3. 3

   Perform Transmission Calibration

   If a potentiometer, PWM solenoid, or the microprocessor is replaced—or if a mechanical repair is effected—you must perform a Transmission/EDC Calibration setup procedure to clear the codes and relearn the clutch/shift parameters.