Description:

The error code ETC 000923.12 is triggered when the power module (HF) PC6 measures in excess of 1 amp at one or both fan motor outputs (lead 2043 and/or 2047) while the fan motors (M07 and M10) are switched off. This indicates a short in the circuit or an internal fault in the power module.

Reaction:

When this fault is detected, the control unit may deactivate the fan motors to prevent damage and ensure safe operation. This will result in reduced cooling efficiency.

Recommendations:

Inspect Electrical Circuits:

• Check for Shorts: Inspect the wiring and connectors for the fan motor outputs for signs of shorts to ground. Look for damaged insulation, exposed wires, or pinched cables.
• Measure Current Draw: Use a multimeter to measure the current draw in the fan motor circuits to ensure it is zero when the motors are off.

Test and Replace Components:

• Test Fan Motors: Verify the operation of the M07 and M10 fan motors. Replace the motors if they are found to be drawing current when they should be off.
• Inspect Power Module: Ensure that the power module (HF) PC6 is functioning correctly. Replace the power module if it is found to be faulty.

Repair or Replace Wiring:

• Fix Damaged Wiring: Repair or replace any damaged or shorted wiring in the fan motor circuits. Ensure all connections are secure and properly insulated.

Process Related Diagnostic Codes:

• ETC 000923.01: Address any issues related to this code first, as it pertains to the voltage supply for the fan motor outputs and can be related to the current issues detected.

Note:

Regular maintenance and inspection of the cooling system’s electrical components can help prevent issues related to short circuits. Ensuring proper routing and securing of wires can reduce the risk of shorts and enhance the reliability of the system.