A6 Quattro Wagon V6-2.8L (AFC) (1995)
Idle Air Control Valve: Testing and Inspection
NOTE: For function testing of the Idle Air Control (IAC) valve, also see, On-Board Diagnostics "Read Measuring Value Block" function 08.
See: Computers and Control Systems/Testing and Inspection
ELECTRICAL CHECK
Idle Air Control Valve Connection
-
Disconnect harness connector from IAC valve.
Idle Air Control Valve Testing
-
Measure resistance on IAC valve.
^
Specified value: 7-11 ohms
If specified values are not obtained:
-
Replace IAC valve.
NOTE: At room temperature, the resistance lies lower in the tolerance range; with the engine warmed to operating temperature, it is higher in the
tolerance range.
MECHANICAL CHECK
-
Remove idle air control valve.
Idle Air Control Valve
-
Check rotary slide valve (arrow) for signs of scoring (by visual inspection).
CAUTION!
When checking free movement, do not move the rotary slide valve with a screwdriver or other tool.
-
Re-connect harness connector to removed valve.
-
Switch ignition on.
-
Use On-Board Diagnostics, Output Diagnostic Test Mode (DTM) to activate idle air control valve. See: Computers and Control