Description:

This diagnostic code indicates that the voltage in the ECU’s second 5-volt supply circuit is exceeding the specified limit, likely due to a short to 12 volts. Excessive voltage can lead to sensor damage, resulting in erroneous measurements or total sensor failure.

Reaction:

The ECU may deactivate affected sensors to protect them from high voltage damage, which can lead to reduced functionality or incorrect engine management decisions.

Recommendations:

• Check for Voltage Shorts: Inspect the circuit for potential sources of the voltage increase, such as shorts to higher voltage lines.
• Measure and Verify Voltage Output: Use a multimeter to confirm that the supply voltage is higher than normal.
• Repair Circuit Issues: Address any issues found, such as replacing or repairing damaged wires or voltage regulators.
• Reset ECU and Test for Accurate Sensor Feedback: After repairs, reset the ECU to clear the code and test the sensors under various conditions to ensure they operate correctly with the stabilized voltage.

Note:

Ensuring the correct voltage in sensor supply circuits is essential for reliable sensor operation and accurate data processing by the ECU.