Case IH t15 – PCU (Power Control Unit) / Engine ECU: Shut-Off Signal, Data Valid But Above Normal Range

Indicates an incorrect supply to the Fuel Injection Pump (FIP). It is typically caused by an internal fault within the fuel injection pump itself or a CAN error on the FIP CAN BUS network. When triggered, the engine enters a 'limp home' condition: engine performance is reduced, fuel quantity is restricted, and the engine speed is hard-limited to 1300 RPM.

• MXM
• MXM120
• MXM130
• MXM140
• MXM155
• MXM175
• MXM190

1. 1

   Check for an Open Circuit: Measure resistance between connector C273 pin 5 (PC3–Y) and C316 pin 20 (PC3–Y), between C273 pin 7 (2009–G) and C316 pin 21 (2009–G), and between C273 pin 6 (B) and ground. Wiggle the harness and connectors to check for an intermittent open circuit.

2. 2

   Check for a Short to Ground: Measure resistance between connector C273 pin 5 (PC3–Y) and ground, and between C273 pin 7 (2009–G) and ground. Wiggle the harness.

3. 3

   Check for a Short to Positive Voltage: Disconnect connector C315. Turn the keystart ON. Measure the voltage between connector C273 pin 5 (PC3–Y) and ground, C273 pin 7 (2009–G) and ground, and C315 pin 18 (MG128–O) and ground. Wiggle the harness.

1. 1

   Disconnect Power

   Turn off the tractor and disconnect the battery to ensure safety.

2. 2

   Inspect Connectors

   Inspect the fuel injection pump connectors for corrosion, damaged pins, or loose connections. Clean and secure if necessary.

3. 3

   Perform Wiring Diagnostics

   Run the multimeter checks listed in the diagnostic checks to rule out harness and connector failures.

4. 4

   Replace the FIP

   If the harness and connectors test perfectly fine, the fuel injection pump has failed internally and must be removed and replaced.

5. 5

   Mechanical Installation

   Remove the faulty fuel injection pump. Installing a new injection pump requires precise engine timing. Use the appropriate OEM Crankshaft Timing Pin and Fuel Injection Pump Timing Pin tools to ensure proper fuel delivery timing.

6. 6

   Bleed the System

   Install the replacement pump, reconnect all lines, and bleed the diesel fuel system of air.

7. 7

   Clear Codes

   Reconnect the battery, clear the fault codes using a diagnostic service tool, and test run the tractor to ensure the limp-home mode is deactivated and full RPM is restored.