Idle Speed/Throttle Actuator - Electronic: Testing and Inspection

NOTES
- Idle Speed, Ignition Timing And CO Content Not Adjustable.
- The Idle Speed Is Regulated By The Throttle Valve Control Module.
- The Position Of The Distributor Has No Influence On Ignition Timing.
- The CO Content Is Held To Specification By The Oxygen Sensor Control.
- Malfunctions In Oxygen Sensor Control Will Be Detected By On Board Diagnostic (OBD) And Stored In Diagnostic Trouble Code (DTC) Memory.

Special Tools, Testers And Auxiliary Items
- VAG 1551 scan tool with VAG 1551/3 adapter cable

Test Conditions
- No malfunctions stored in DTC memory, see Function 02.
- Engine oil temperature minimum 80°C (176°F)
- Electrical consumers switched off (Radiator coolant fan must not run during the check).
- A/C switched off
- Exhaust system must be free of leaks.

Test Sequence
- Engine running at idle
- Connect VAG 1551/1552 scan tool and select "Engine Electronics" address word 01.

Indicated On Display

Rapid data transfer HELP
Select function XX

- Press buttons -0- and -4-to select "Basic Setting" function 04 and press -Q- button to confirm input.

Indicated on display

Basic Setting HELP
Input display group number XXX

- Press buttons -0-, -0- and -1- to input display group 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 "Basic Setting" function O4 the Evaporative Emission canister purge regulator valve -N80- is closed.


- Do not continue with check until engine temperature exceeds 80°C (176°F) (display field 2).
- Briefly increase engine speed (rev-up) and then allow engine to run at idle speed for 2 minutes.
- Check specifications (display fields 1-4).




Display group 001: Idle Test

- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06 and press -Q- button to confirm input.
- Carry out road test and repeat the check.
- Read the readiness code, If DTC memory has been erased, repair must be verified via appropriate display group: Readiness code-creating.