New Holland 135 – ECM: Oil Pressure Sensor Voltage Too High

The Engine Control Module (ECM) has detected a signal voltage from the engine oil pressure sensor that exceeds the manufacturer's specified maximum threshold. This indicates an electrical fault within the sensor or its associated circuit, such as a short to power or an open ground, rather than a mechanical issue with the engine's oil pressure system.

• T4 Series
• T6 Series
• T7 Series
• T8 Series
• TG Series
• T8010
• T8020
• T8030
• T8040
• T8050
• TG210
• TG215
• TG230
• TG245
• TG275
• TG305
• L-Series
• L140
• L150
• L160
• L170
• L175
• LS-Series
• LS140
• LS150
• LS160
• LS170
• LS180
• LS190
• LX-Series
• LX865
• LX885
• LX985
• C-Series

1. 1

   Check for multiple active fault codes, as shared power or ground circuits could indicate a wider wiring harness or ECM supply issue

2. 2

   Visually inspect the wiring harness and electrical connector at the oil pressure sensor for damage, corrosion, dirt, or loose pins

3. 3

   Test the sensor circuit using a multimeter to verify correct supply voltage, ground continuity, and check for short circuits to power (5V or battery)

4. 4

   Disconnect the sensor and measure its internal resistance with a multimeter, comparing it to service manual specifications

5. 5

   Temporarily install a mechanical pressure gauge to verify actual engine oil pressure and definitively rule out a rare mechanical high-pressure condition

1. 1

   Safety First

   Disconnect the negative battery cable to prevent electrical hazards.

2. 2

   Locate the Sensor

   Locate the oil pressure sensor on the side of the engine block, often near the oil filter or the ECM.

3. 3

   Prepare for Oil Spillage

   Place a rag or container under the sensor, as a small amount of engine oil may leak out upon removal.

4. 4

   Remove the Old Sensor

   Disconnect the electrical wiring harness from the sensor. Using the appropriate size wrench or a dedicated oil pressure sensor socket, turn the sensor counter-clockwise to unscrew and remove it from the engine block.

5. 5

   Clean the Area

   Wipe the sensor mounting port on the engine block to ensure a clean sealing surface.

6. 6

   Install the New Sensor

   Compare the new sensor to the old one to ensure they match. If the new sensor does not have pre-applied thread sealant, apply a small amount to the threads. Screw the new sensor in by hand until it is snug, then tighten it to the manufacturer's specified torque. Do not overtighten, as this can damage the sensor or the engine block.

7. 7

   Reconnect and Finalize

   Securely reconnect the electrical connector to the new sensor. Reconnect the negative battery cable.

8. 8

   Functional Check

   Start the engine and check for any oil leaks around the new sensor. Verify that the fault code has cleared and the oil pressure reading on the dashboard (if equipped) is normal.