New Holland ENG 483 – Engine Control Module (ECM): Rear Bank Post Actuactor Pressure voltage high

The Engine Control Module (ECM) has detected that the signal voltage from the rear bank fuel rail pressure sensor is too high (typically greater than 4.75 VDC for more than 3 seconds).

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1. 1

   Visually inspect the fuel rail pressure sensor wiring harness and connectors for physical damage, moisture, corrosion, or pushed-back pins

2. 2

   Check for internal wire breakage going directly into the fuel rail pressure sensor connector (outer insulation may remain intact)

3. 3

   Perform a voltage supply test by disconnecting the sensor and measuring the supply voltage at the connector from the ECM (should be a steady 5 VDC)

4. 4

   Test the signal wire for a short circuit to the 5-volt supply or a short to battery voltage

5. 5

   Use New Holland EST or Cummins INSITE to monitor the Injector Metering Rail 2 pressure voltage live data to verify if the voltage is pegged high

1. 1

   Turn the keyswitch to the OFF position and allow the ECM to power down completely.

2. 2

   Disconnect the engine wiring harness from the Injector Metering Rail 2 (Rear Bank) Pressure Sensor.

3. 3

   If the diagnostic checks reveal a broken wire or short in the harness near the connector, repair the wiring using an approved electrical repair connector/pigtail (Cummins Procedure 019-199).

4. 4

   If the wiring, 5-volt supply, and ground circuits all test good, the sensor has failed internally and is shorting the signal high. Remove the faulty pressure sensor from the high-pressure fuel rail.

5. 5

   Install the new fuel rail pressure sensor and torque to OEM specifications.

6. 6

   Reconnect the engine wiring harness.

7. 7

   Turn the keyswitch ON, start the engine, and let it idle for at least 1 minute. Verify that the fault code status changes to INACTIVE and the amber CHECK ENGINE lamp turns off. Clear the inactive codes using your diagnostic tool.