High Pressure Sensor -G65-, Checking Pressure Signal
The cooling output cannot be checked with the connector -A- removed or when the High Pressure Sensor -G65- -B- is removed, the Front A/C Display Control Head -E87-, does not activate the A/C compressor. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
To check the measured value of the High Pressure Sensor -G65-. Use the Vehicle Diagnostic Tester in the function "Guided Fault Finding" .
The High Pressure Sensor -G65- exchanges information with the Front A/C Display Control Head -E87- via the local data bus.
Only High Pressure Sensors -G65- may be installed on this vehicle that exchanges information with the Front A/C Display Control Head -E87- along the local data bus.
A High Pressure Sensor -G65- that emits square-wave signals may not be installed on these vehicles (it may have the same construction and only varies in part number).
On this vehicle, it may take a while until the pressure on the high pressure side comes down after the A/C compressor is switched off. The expansion valve(s) is/are "cold" and the pressure on the low pressure side increases quickly after deactivation, the expansion valve(s) closes/close and the refrigerant can flow only slowly on the low pressure side.
Preliminary Work
-- Switch off the ignition.
-- Remove the cover on the lock carrier. Refer to RADIATOR/RADIATOR FAN / OVERVIEW - RADIATOR/RADIATOR FAN .
-- Disconnect the connector -A-.
Assignment of the 3-Pin Connector on the High Pressure Sensor -G65- -A- the appropriate Wiring Diagram(s).
- Ground
- Signal Output - via the Local Data Bus to the Front A/C Display Control Head -E87-
- Terminal "75" (Positive)
Test Sequence:
-- Switch the ignition on.
-- Check the ground and positive connection to the terminal -A-.
-- Check the connection and the function of the High Pressure Sensor -G65- as described in the Guided Fault Finding. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
The A/C compressor (A/C Compressor Regulator Valve -N280-) is not actuated when the connector -A- is disconnected.
The High Pressure Sensor -G65- is an electronic control module that exchanges information with the Front A/C Display Control Head -E87- via a local data bus. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.