New Holland ENG 1013 – Engine Control Module (ECM): Battery 5 V Reference2 Circuit High

The ECM detects voltage on the 5V Reference 2 circuit that is higher than the expected 5 volts (typically shorted to a 12V battery source) or there is an open circuit causing the ECM to see a high voltage on its internal pull-up resistor.

• Skid Steer Loaders (L220, SR175)
• Backhoe Loaders (B90B, B100B)

1. 1

   Ensure the battery is fully charged and cables are clean and tight, and verify that the ECM ground connections are clean, tight, and in their proper locations.

2. 2

   Inspect the ECM harness connectors (J1 & J2) for dirt, corrosion, or pushed-out pins.

3. 3

   Perform a sensor isolation drop test: turn the ignition ON (engine off), monitor the 5V Reference 2 voltage, and unplug sensors on the circuit one at a time. If voltage returns to 5.0V, the unplugged sensor is internally shorted.

4. 4

   If all sensors on the circuit are unplugged and the voltage remains high, trace the engine wiring harness looking for chafe marks, melted loom, or pinch points indicating a short to a 12V power source.

1. 1

   Disconnect Power

   Turn off the ignition and disconnect the negative battery terminal before repairing any wiring.

2. 2

   Address the Short

   If a sensor failed: Replace the internally shorted sensor identified during the isolation test. If the harness failed: Locate the short-to-voltage in the wiring harness. Repair the damaged wire using OEM-approved methods (solder and heat-shrink tubing or weather-pack replacement terminals).

3. 3

   Reassembly

   Reconnect all sensor connectors and the negative battery terminal.

4. 4

   Clear Codes

   Connect a diagnostic scan tool, clear the ENG 1013 fault code, and cycle the ignition.

5. 5

   Verification

   Start the engine and verify that the 5V Reference 2 circuit reads a steady ~5.0V and the fault code does not return.