Damaged insulation of the wire unit of the temperature sensor (reference 4 image), which measures the temperature inside the compartment of the Light Processor Unit. When disconnecting the wire unit of the temperature sensor from the Signal Backplane (reference 14 image) the error code is changed to “engine air - temperature sensor open”.

1. Repair the insulation of the wire unit using shrink sleeve.

2. If not repairable, replace the whole wire unit and temperature sensor.

Defect temperature sensor (reference 4image) of the Light Processor Unit. When disconnecting the wire unit of the temperature sensor from the Signal Backplane (reference 14 image) the error code is changed to “engine air - temperature sensor open”.

Replace the whole wire unit and temperature sensor.