Description:

ECU 000157.03 is triggered when the input voltage at the fuel rail pressure sensor exceeds the highest specified limit, indicating a potential short to a 12-volt source. This electrical fault can lead to incorrect sensor readings and erratic engine behavior.

Reaction:

The engine’s fuel management system may respond incorrectly to the faulty sensor data, potentially causing over-fueling or under-fueling scenarios.

Recommendations:

• Check Sensor Wiring: Inspect the wiring to the sensor for signs of damage or short circuits.
• Measure Voltage at Sensor: Use a multimeter to check the voltage level at the sensor. Replace or repair wiring if voltages exceed normal levels.
• Replace Sensor if Necessary: If the sensor or its wiring is damaged, replace them to ensure correct voltage and functioning.
• ECU Diagnosis and Reset: After repairs, diagnose the ECU to ensure no other faults are present and reset it to reestablish normal operations.

Note:

Regular inspections of electrical connections and components can prevent issues like over-voltage, safeguarding sensor integrity and functionality.