Case IH 6115 – Transmission Controller (TRANS): Lube Valve Coil circuit is shorted to 12 volts when the valve is ON

The transmission controller has commanded the lube valve solenoid coil to turn on, but the system detects that the voltage on the low side of the coil is higher than expected. This condition points to a short circuit to a 12-volt power source.

• STX Steiger
• Puma
• Steiger
• Magnum
• Maxxum

1. 1

   Inspect the wiring harness between the transmission controller and the lube valve solenoid for chafed, pinched, or melted wires bridging the circuit to a 12V power source.

2. 2

   Perform a solenoid coil resistance test by disconnecting the electrical connector and measuring resistance across the coil pins to check for a dead short.

3. 3

   Perform a controller output test to determine if the transmission controller has an internal failure (if wiring and coil test good).

1. 1

   Safety First

   Park the tractor on a level surface, turn off the engine, and disconnect the battery to prevent electrical spikes during repair.

2. 2

   Locate the Valve

   Locate the transmission control valve block and identify the supplementary lube valve solenoid.

3. 3

   Disconnect and Isolate

   Unplug the electrical connector from the lube valve solenoid.

4. 4

   Repair Wiring

   If your diagnostic tests revealed a short to power in the harness, repair or replace the damaged section of the wiring harness.

5. 5

   Replace the Solenoid

   If the coil is internally shorted, remove the retaining nut/fastener holding the coil to the valve stem. Slide the old coil off and install the new replacement coil. (On some valve blocks, the entire solenoid valve cartridge must be unthreaded and replaced).

6. 6

   Reassemble

   Reconnect the electrical harness to the solenoid.

7. 7

   Test and Calibrate

   Reconnect the battery. Clear the stored fault codes from the Transmission Controller. Start the tractor and operate the transmission (specifically modulating the clutches) to ensure the code does not return.

8. 8

   Controller Replacement

   If the code returns and the wiring/solenoid are 100% verified as good, the transmission controller must be replaced and the transmission recalibrated.