John Deere 1075 – RCU: Fuel Transfer Pump (cc# 188) is OFF when commanded ON by right power module

The Right Power Module (RPM) has commanded the fuel transfer pump (circuit #188) to turn ON, but the module detects that the pump is not running. The electrical circuit is complete, but the pump is not drawing the expected electrical current, signaling that it has failed to activate. This condition triggers a Service Alert priority code.

• 9570 STS
• 9670 STS
• 9770 STS
• 9870 STS

1. 1

   Review active diagnostic trouble codes to see if other related faults are present, such as an open circuit (1075.05) or CAN bus communication errors (1231.09)

2. 2

   Inspect the dedicated fuel transfer pump fuse (e.g., F26 located on the right-hand side fuse center) and replace if blown

3. 3

   Attempt to prime the fuel system by turning the key switch to the ON position for 60 seconds and listen for the audible sound of the pump running

4. 4

   Visually inspect the wiring harness and connectors between the Right Power Module (RPM) and the fuel transfer pump for damage, corrosion, or loose connections

1. 1

   Safety First

   Shut off the engine, set the parking brake, and remove the key before beginning any repair work.

2. 2

   Locate the Fuel Transfer Pump

   The fuel transfer pump is part of the fuel system and is typically located near the fuel tank or fuel filters.

3. 3

   Disconnect Electrical and Fuel Lines

   Carefully disconnect the electrical connector to the pump. Then, disconnect the fuel inlet and outlet lines. Be prepared for some fuel spillage and have appropriate containers and rags ready.

4. 4

   Remove the Old Pump

   Unbolt the fuel transfer pump from its mounting bracket.

5. 5

   Install the New Pump

   Mount the new fuel transfer pump. Reconnect the fuel lines and the electrical connector.

6. 6

   Prime the System

   Turn the key to the ON position for at least 60 seconds to allow the new pump to prime the fuel system and purge any air that entered the lines.

7. 7

   Start the Engine

   Start the engine and check for any fuel leaks at the connections.

8. 8

   Clear Fault Codes

   Use the machine's diagnostic interface to clear the RCU 1075.06 fault code. Operate the machine and verify that the code does not return.