Jetta GLS V6-2.8L (AFP) (2002)
Idle Speed: Testing and Inspection
With Manufacturer's Scan Tool
Idle Speed, Checking
NOTE:
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Idle speed, ignition timing and CO content are not adjustable.
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The idle speed is regulated to specified value by the throttle position sensor in conjunction with the DIS function.
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CO content regulated by Oxygen Sensor (O2S) control. Malfunctions in oxygen sensor control are detected in On Board Diagnostic (OBD) and
stored as DTCs in DTC memory
Special tools and equipment
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VAG1551 Scan Tool (ST) or VAG1552 mobile scan tool with VAG1551/3 adapter cable
Test requirements
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Exhaust system between Three Way Catalytic Converter (TWC) and cylinder head must be free of leaks
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All electrical consumers (e.g. lights and window defroster) must be switched off
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A/C switched off
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Automatic transmission selector lever in "P" or "N" position
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Coolant temperature at least 85 °C See display group 004, display field 3.
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Intake air temperature less than 60 °C See display group 004, display field 4.
Test sequence
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Connect VAG1551 (VAG1552) Scan Tool (ST).
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Switch ignition on and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (when doing this engine must be running at idle).
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Check DTC memory. If necessary, repair any malfunctions and erase DTC memory.
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Display readiness code.
If DTC memory has been erased or the Engine Control Module (ECM) was disconnected from permanent battery (B+) voltage, the readiness code must
be generated again. See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
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Leave VAG1551 Scan Tool (ST) connected.
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Continue running engine at idle speed.
Indicated on display
Rapid data transfer
HELP
Select function XX
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Press buttons -0- and -4- to select "Basic Setting" function 04 and press -Q- button to confirm input.
Indicated on display
Basic setting
Input display group number XXX
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Press buttons -0-, -0- and -1- to input display group number 1 (001) and press -Q- button to confirm input.
Indicated on display: (1-4= display fields)
System in basic setting 1
->
1
2
3
4
NOTE: In the "Basic Setting" function the Evaporative Emissions (EVAP) canister purge regulator valve -N80- is closed and the air conditioner
compressor is switched off
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Check adjustment conditions for basic setting in display field 4.