Description:

This code, ECU 000109.04, indicates that the coolant pressure signal is out of the normal range low, typically due to a short to ground. This error can result in the sensor transmitting lower than actual pressures to the ECU, possibly leading to inadequate cooling measures.

Reaction:

The system may not activate necessary cooling functions, under the false assumption that the coolant pressure is within a safe range, which can risk overheating.

Recommendations:

• Check Sensor Wiring and Ground Connections: Ensure that there are no grounding issues in the sensor circuit. Inspect for exposed wires or loose connections.
• Measure Sensor Voltage: Confirm that the voltage levels at the sensor are within the expected range using diagnostic tools.
• Rectify Wiring or Sensor Issues: Repair or replace damaged components as required to restore accurate signal transmission.
• ECU Reset and Code Clearance: Clear any stored codes and reset the ECU following repairs to recalibrate the system’s response to the corrected sensor signals.

Note:

Preventive maintenance of the coolant system’s electrical components is essential to avoid misreadings that could lead to engine overheating.