Case IH F-2634-06 - ECU – Engine Control Unit (ECU) A-095: Auxiliary power relay high side driver circuit short to ground failure

The Engine Control Unit has detected a short to ground condition in the high side control circuit for the auxiliary power relay (K-064). The ECU monitors the voltage it sends to this relay, and if the voltage drops out due to a ground short, it triggers this code.

• MAGNUM AFS Connect
• 240 Series Axial-Flow Combines
• 7240
• 8240
• 9240
• Puma
• Magnum tractors

1. 1

   Visually inspect the relevant engine wire harnesses and connectors for obvious signs of rubbing, melting, or damage.

2. 2

   Test for continuity to ground in the engine harness between the ECU A-095 engine plug connector (specifically connector X-917) and the auxiliary power relay (K-064) circuit.

3. 3

   Test the K-064 relay coil itself to ensure it has not failed internally and shorted out.

4. 4

   If there is no continuity to ground (meaning no physical short is found in the harness), check the ECU A-095 to ensure it has the appropriate software version.

1. 1

   Disconnect Power

   Disconnect the machine's battery before servicing the ECU or wiring harness.

2. 2

   Harness Repair

   If your multimeter testing in the diagnostic phase indicated a short circuit to ground, locate the exact point of failure in the wiring harness. Repair the grounded conductor or replace the affected section of the wire harness as required.

3. 3

   Relay Replacement

   If the wiring is intact but the K-064 relay coil is faulty, remove the old relay from the fuse/relay panel and install a new one.

4. 4

   ECU Re-flash / Replacement

   If no physical short is found in the wiring or the relay, the ECU A-095 may have a software glitch or internal hardware failure. Re-flash the ECU with the latest software using the Electronic Service Tool (EST). If the code persists and the ECU cannot be recovered, the ECU A-095 must be replaced.

5. 5

   Clear Codes

   Reconnect the battery, turn the key on, and use the EST to clear the inactive fault codes.