Passat Syncro Wagon V6-2.8L (ATQ) (2000)
Idle Speed: Testing and Inspection
Idle, checking
NOTE:
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Idle speed, ignition timing, and CO content cannot be adjusted.
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Idle speed (RPM) is adjusted to a specified value by Engine Control Module (ECM).
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CO content is adjusted to a specified value by oxygen sensor control. Problems with the oxygen sensor control are recorded by the On Board
Diagnostic (OBD) and stored in the DTC memory.
Test requirements
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EPC indicator lamp may not be switched on. Significance of EPC warning lamp. Refer to Description of On-Board Diagnostics/EPC Warning
Lamp Operation See: Computers and Control Systems/Testing and Inspection/Initial Inspection and Diagnostic Overview/Electronic Power
Control (EPC) Warning Light/EPC Warning Lamp Operation
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Parking brake must be engaged or else daylight driving lights will be switched on
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Exhaust system must be properly sealed between cylinder head and catalytic converter
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Coolant temp. at least 80 °C See Display group 04, display field 3
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All electrical consumers like, for example, lights and rear window heating must be switched off
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A/C system must be switched off
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For automatic transmission, selector lever must be in -P- or -N-
Test sequence
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Connect V.A.G 1551 scan tool (VAG 1552). Start engine and select Engine Control Module (ECM) using address word 01. Refer to Scan Tool
Testing/Scan Tool Connecting and Initial Checks/Connecting V.A.G 1551 Scan Tool See: Computers and Control Systems/Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Manufacturer's Scan Tool/Connecting VAG 1551 Scan
Tool
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Check DTC memory, repair malfunctions if necessary and then erase DTC memory, Erasing and checking DTC memory.
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Then:
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Connect Scan Tool (ST) V.A.G 1551
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Let engine continue to idle
Indicated on display
Rapid data transfer
HELP
Select function XX
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Press 0 and 4 for the function "Basic Adjustment", and then press Q to exit from input mode.
Indicated on display
Basic Setting
HELP
Input display group number XXX
Checking Idle Speed (RPM)
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Press 0, 5, and 6 for "Display Group No. 56", and then press Q to exit from input mode.
Indicated on display (1 - 4 = display fields)
System in Basic Setting 56
->
1
2
3
4
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Check idle speed (RPM) in display field 1. Specified value
All-wheel drive: 620-740 RPM
Front-wheel drive: 710-860 RPM
NOTE: If engines of front-wheel drive vehicles run at 620-740 RPM, check control module coding.
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Press -> button.
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Press 0 and 6 for the function "End Output", and then press Q to exit from input mode.
If idle speed (RPM) is not obtained:
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Adapt Engine Control Module (ECM) to throttle valve control module.