Case IH 46 – Power Shuttle Electronic Control Module (Transmission ECM): FUSE ERROR

Triggered when the tractor is turned on and the ECM detects that the voltage at ECM Connector 2, Pin 1 is low, while the voltage at ECM Connector 2, Pin 10 is high. This indicates that the keyed 12-volt power supply circuit protecting Pin 1 has been interrupted.

• JXC
• Farmall 80C
• Farmall 90C
• Farmall 95N
• Farmall 100C
• Farmall 105A
• JX
• JXU
• TN75A
• TN70A
• T4
• T5

1. 1

   Check Fuse #15: Locate fuse number 15 in the fuse panel. Verify if the 5-amp fuse is blown.

2. 2

   Check for Open Circuits: If the fuse is intact, check for an open circuit between the battery and the key switch, or between the key switch and the fuse.

3. 3

   Check ECM Wiring: Test for an open circuit in the wiring harness between Fuse 15 and ECM Connector 2, Pin 1.

4. 4

   Test Voltage: Turn the key to the ON position. Use a multimeter to verify that +12V is reaching the fuse block and passing through to the ECM connector.

1. 1

   Power Down

   Turn the starter key to the OFF position.

2. 2

   Inspect the Fuse

   Remove the left-hand guard/panel to access the fuse block. Locate Fuse 15. If it is blown, replace it with a new 5 Amp mini fuse.

3. 3

   Test for Shorts

   If the new fuse blows immediately upon turning the key ON, trace the wire from Fuse 15 to ECM Connector 2, Pin 1 to find and repair the short to ground.

4. 4

   Test the Harness

   If the fuse is good, disconnect the control panel and the connections on the Transmission ECM (specifically Connector 2). Turn the starter key to the ON position. Measure the voltage at the harness side of Connector 2, Pin 1.

5. 5

   Repair Wiring

   If there is no +12V reading at the pin, repair the break in the wiring harness between the fuse block and the ECM.

6. 6

   Replace ECM (Last Resort)

   If the wiring is perfectly intact, +12V is reaching Pin 1, and the code persists, the Transmission ECM itself has an internal fault and must be replaced.

7. 7

   Clear Codes

   After the repair is complete, the cause must be resolved and the error must be cleared using the CDU (Control Display Unit) or the EST (Electronic Service Tool) via the HF Menu.