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A/C Signal|Testing and Inspection|Page 4257 > < Valve Clearance|Specifications
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A/C Signal: Testing and Inspection

A/C Compressor Shut-Off, Checking

Special tools and equipment

-

VAG1526A

-

VAG1594A

-

VAG1598/31

-

VAS5051 with VAG5051/1

or

-

VAG1551 with VAG1551/3B

NOTE:

The A/C compressor signal communicates to the ECM that the compressor will be switched on in 140 ms.

The ECM can switch off the A/C compressor via the same wire connection.
Engine Control Module (ECM) switches off A/C compressor:

-

during hard acceleration (Wide Open Throttle 1st gear)

-

in emergency mode (emergency operation)

-

after initiating basic setting (function 04)

Test requirements:

-

A/C system OK

-

No DTCs in DTC memory of Engine Control Module (ECM).

-

Vehicle at room temperature (warmer than +15 degree C).

A/C Signal|Testing and Inspection|Page 4257 > < Valve Clearance|Specifications