The UK quattro Network
The UK's mobile Audi 5-cylinder mechanic - 07833 654800, 24x7
Specialist in turbos, quattros, electrics and non-starts
Audi KG turbo engine MAC05 error codes
- Check idle and full throttle switches on throttle body working
- Check brake lights working
- Test drive vehicle, attempting to recreate problem condition - minimum 10 minutes, above 80°C, 3,000 rpm and 1.2 bar if possible; accelerate hard in 3rd gear
- Leave engine running
- If engine will not start, turn on starter for five seconds and leave ignition on
- Reading codes erases them - to repeat, repeat test drive
- Remove throttle switch cover or attach remote WOT switch lead
- Close full throttle switch by hand or remote WOT switch for ten seconds
- Tachometer should read 7000 - "check engine" light on.
- Press brake pedal to step through codes:
| Tachometer | Check Engine Light | Cause |
|---|
| 1000 rpm | Off | RPM sensor |
| 1000 rpm | On | Knock control |
| 2000 rpm | Off | Ignition timing sensor |
| 2000 rpm | On | Knock Sensor |
| 3000 rpm | Off | Hall sensor |
| 3000 rpm | On | Intake air temp. |
4000 rpm or
6000 rpm | Off | ECU vacuum hose or
Idle switch |
| 4000 rpm | On | Coolant temp. sensor |
| 5000 rpm | Off | ECU Pressure sensor |
| 7000 rpm | Off | End of sequence |
Kerbside Motors Home Page and Contact Information
Contact Phil Payne by email or use mobile/SMS 07833 654800