Case IH 3137 – Engine Controller (ECM / EDC): Engine Controller High Pressure Pump Metering Driver - Open Load

The Engine Control Module (ECM) has detected an open circuit ("open load") in the electrical circuit that drives the high-pressure fuel pump's metering unit.

• Farmall
• Steiger T4B
• skid steer
• Magnum series
• Steiger series
• Puma series
• Maxxum series
• Farmall series
• Skid Steer Loaders (SSL) and Compact Track Loaders (CTL)

1. 1

   Visual Inspection: Check the electrical connector at the high-pressure pump metering unit for loose, corroded, or pushed-out pins.

2. 2

   Wiring Harness Continuity: Trace the wiring harness between the metering unit and the Engine ECM. Look for chafing, breaks, or disconnected inline connectors. Use a multimeter to verify continuity on both the power and ground/control wires.

3. 3

   Relay Check: Check Main Relay 1, which supplies power to the high-pressure pump fuel metering unit, to ensure it is functioning and properly seated.

4. 4

   Component Resistance Test: Disconnect the metering unit and measure the resistance across its solenoid pins. A healthy M-Prop valve typically reads between 2.4 to 3.15 ohms. An infinite reading (OL) confirms the solenoid is internally open and the unit must be replaced.

1. 1

   Preparation

   Turn off the machine, remove the key, and disconnect the battery to prevent electrical shorts.

2. 2

   Clean the Area

   Thoroughly clean the exterior of the high-pressure fuel pump and the surrounding area. The common rail fuel system is highly sensitive to contamination; no dirt must enter the pump during this process.

3. 3

   Disconnect

   Unplug the electrical connector from the faulty metering unit.

4. 4

   Removal

   Remove the mounting fasteners (usually Torx or Allen screws) securing the metering unit to the high-pressure pump. Carefully twist and pull the metering unit out of the pump housing.

5. 5

   Lubrication

   Lubricate the O-rings on the new metering unit with clean diesel fuel or clean engine oil to prevent tearing during installation.

6. 6

   Installation

   Insert the new metering unit into the pump housing. Install and tighten the mounting screws to the OEM specified torque.

7. 7

   Reassembly

   Reconnect the electrical harness to the new unit. Reconnect the battery.

8. 8

   Bleed the System

   Bleed the fuel injection system to remove any air introduced during the repair (often required after opening the high-pressure pump circuit).

9. 9

   Clear Codes

   Use a diagnostic service tool to clear fault code 3137 and test run the engine to verify the repair.