90 Quattro Sport V6-2.8L (AFC) (1995)
Idle Speed: Adjustments
Test conditions
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No leaks in exhaust system.
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Engine Coolant Temperature (ECT) minimum 85°C (185°F).
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Throttle valve in closed throttle position. Adjust accelerator pedal cable if necessary.
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All electrical consumers switched OFF.
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A/C switched OFF.
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Pressure measuring devices NOT connected.
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Automatic transmission vehicles: selector lever in P or N.
Checking Idle Speed
NOTE:
Idle speed cannot be adjusted.
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Connect VAG 1551 scan tool. Refer to Connecting and Operating VAG Scan Tool.
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Step through program until "Select function XX" display appears. Display will appear as shown:
Rapid data transfer
HELP
Select function XX
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Check DTC memory.
^
There should be no malfunctions stored.
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If necessary, repair malfunction, erase DTC memory, stop engine (switch ignition OFF) and start again. Test drive and check DTC memory
again to make sure no malfunctions are stored.
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After checking DTC memory, let engine continue to idle.
CAUTION!
^
Do not take any measurements while the radiator coolant fan is running.
^
Engine coolant temperature must be 85°C (185°F) minimum.
Display will appear as shown:
Rapid data transfer
HELP
Select function XX
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Press buttons 0 and 8 to select "Read Measuring Value Block" function 08.
Display will appear as shown:
Rapid data transfer
Q
08 - Read Measuring Value Block
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Press Q button to confirm input.
Display will appear as shown:
Read measuring value block
HELP
Input display group number XXX
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Press buttons 0, 0 and 3 to select display group 003.
Display will appear as shown:
Rapid data transfer
Q
Input display group number 003
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Press Q button to confirm input.
Display will appear as shown:
Read measuring value block
3
1 2 3 4.
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Read idle speed in display field 1.
^
Specified value: 650-750 RPM
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Press "arrow" button.
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Press buttons 0 and 6 to select "End Output" function 06.
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Press Q button to confirm input.