Beetle L4-1.9L DSL Turbo (ALH) (1998)
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Press -> button.
Display will appear as shown
Output Diagnostic Test Mode (DTM)
->
A/C compressor interruption
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A/C compressor shut-off is checked via Output DTM.
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The A/C compressor must stop within 5 secs., (visual check) then start approx. every 5 secs. and then stop.
If A/C compressor NOT switched OFF
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Proceed with Function 03: Output DTM, until completed.
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Press 0 and 6 buttons to select Function 06: "End output".
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Press Q button to enter input.
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Connect VAG 1598/22 (or 1598/31) Test Box to ECM wiring harness.
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Check wiring for open circuit between following Test Box sockets and A/C system using Wiring diagram.
Up to MY 1999
Socket 16
From MY 2000
Socket 29
Wire resistance: 1.5 Ohms maximum
A/C system signal to ECM (engine speed adaptation), checking
The A/C system signal make sure that the Engine Control Module maintains A/C system operation constant regardless of load at idle.
Test sequence
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Connect VAG 1551/1552 Scan Tool. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks", See: Testing and Inspection
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Start engine and let idle.
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Press 0 and 1 buttons to select Address word 01: "Engine electronics"
Display will appear as shown (example only)
038906018M 1.9l R4 EDC 00AG 1813
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Coding 0001
WSC XXXXX
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Press -> button.
Display will appear as shown
Rapid data transfer
HELP
Select function XX
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Press 0 and 8 buttons to select Function 08: "Read measuring value block".