Beetle L4-1.9L DSL Turbo (ALH) (1998)
Rapid data transfer
Q
03 Output Diagnostic Test Mode (DTM)
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Press -Q- button to enter input.
Indicated on display:
Output Diagnostic Test Mode (DTM)
->
Cold Start Injector -N108-
NOTE: Activating Cold Start Injector -N108- influences pre-ignition (noise).
If no change in combustion noise is heard:
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Check injection timing control range
Activating EGR Vacuum Regulator Solenoid valve -N18-:
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Press -> button.
Indicated on display:
Output Diagnostic Test Mode
->
Exhaust Gas Regulator valve -N18
Valve must click.
NOTE: It is difficult to hear the valve click due to engine noise. Determine valve operation by feel (touch).
Valve does not click:
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Check EGR Vacuum Regulator Solenoid Valve -N18-
Activating air conditioning compressor interrupt:
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Press -> button.
Indicated on display:
Output Diagnostic Test Mode
->
A/C Compressor interrupt
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Air conditioner compressor shut-off is checked.
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Test step is also called up on vehicles without A/C.
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A/C compressor must stop within 5 secs. (visual check) then start approx. every 5 secs. and then stop.
If A/C compressor does not switch off:
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Check signals from/to A/C, refer to "A/C System Signals, Checking".
Activating Fuel Cut-off Valve -N109-:
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Press -> button.
Indicated on display:
Output Diagnostic Test Mode
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Fuel Cut-off Valve -N109-
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Engine must stop.
If engine does not stop:
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Switch off ignition.
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Remove Fuel Cut-off Valve -N109- and remove any metal chips or dirt.
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Repeat Output Diagnostic Test Mode, if engine will not stop replace Fuel Cut-off Valve -N109-.
If engine stops:
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Continue Output Diagnostic Test Mode with engine stopped and ignition on.
Activating Wastegate Bypass Regulator valve -N75-: