Golf GL L4-2.0L (AZG) (2001)
Idle Speed: Testing and Inspection
Idling Check
NOTE:
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Idling speed, ignition timing and CO content not adjustable.
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Idling speed is regulated to specification by engine control module.
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CO content regulated by Oxygen sensor control. Malfunctions in Oxygen sensor control are detected in On Board Diagnostic and stored in DTC
memory.
Special tools and equipment
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V.A.G 1551 scan tool or 1552 scan tool with cable VAG1551/3
Check conditions
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Exhaust system between cylinder head and catalyst free of leaks
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Coolant temperature must be at least 80°C, See display group 04, display zone 3.
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All electrical consumers, e.g. lights and rear window heating must be switched off
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Air conditioning switched off (if equipped).
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On vehicles with automatic transmission the selector lever must be in "P" position.
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No faults must be stored in DTC memory.
Test sequence
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Connect V.A.G 1551 scan tool ((VAG1552). Start engine and select "Address word" 01 of engine control module. When doing this the engine
must be running at idling speed. See: Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble
Codes/Scan Tool Connecting
-
Check DTC memory, if necessary, repair fault and then erase DTC memory.
See: Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Clearing Diagnostic Trouble Codes
See: Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Reading Diagnostic Trouble Codes
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Then:
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Leave V.A.G 1551 scan tool connected.
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Continue running engine at idling speed.
Indicated on display:
Rapid data transfer
HELP
Select function XX
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Press keys 0 and 4 for the function "Introduction of basic setting" and confirm entry with Q key.
Indicated on display:
Basic setting
Input display group number XXX
-
Press keys 0, 0 and 1 for "Display group number 1" and confirm entry with Q key.
Indicated on display: (1 to 4 = Display zones)
System in basic setting 1
->
1
2
3
4
NOTE: In the "System in basic setting" function the EVAP canister purge regulator valve -N80- is closed and the air conditioner compressor switched
off.
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Check the adjustment conditions for basic setting in display zone 4:
Specification: 1x111111
Significance of the numbers. See: Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/With Manufacturer's
Scan Tool/Read Measuring Value Blocks (Function 08)/Evaluating Measuring Value Blocks/Display Groups 0-9 (Basic Functions)
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Briefly increase engine speed (rev- up) and then allow engine to run at idling speed for 2 minutes.
Checking idling speed
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Change to display group 56 as follows:
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Press C key.