Refrigerant Pressure Sensor / Switch: Testing and Inspection

Start engine.
Compressor switched on (AUTO mode selected)

If the compressor is activated:
- Disconnect harness connector -B- from switch.
- Compressor will stop (low pressure switch open).
- Remove switch -A- and install harness connector -B-.

Compressor will not be activated (low pressure switch open).

If the compressor is not activated:
- Disconnect harness connector -B- from switch -A- and bridge terminals -1- and -2- on harness connector -B-.

The compressor will be activated.

NOTES:
- If the compressor is activated when the terminals are connected together, either the pressure in the A/C system is too low (A/C system empty), or the switch is malfunctioning.
- If the compressor is not activated and the measuring value block display indicates A/C pressure switch -F129- as the cut-off condition, there is an open circuit in the wiring between A/C pressure switch -F129- and A/C control head -E87-. Repair the open circuit.