Memory damage
1. The KE III-Jetronic system is equipped with a fault memory shared between the fuel injection system and the ignition system. The self-monitoring procedure is described in Section 4, Chapter 8.
Lambda control
2. Connect the multimeter to the differential pressure regulator.
3. Allow the engine warmed up to normal operating temperature to idle for two minutes.
4. Note the current in the control circuit, then remove the level probe, the current in the control circuit should increase. If not, disconnect the wires of the Lambda sensor and ground the green wire for about twenty seconds. If the current in the control circuit now changes, the lambda sensor is faulty.
Enrichment cold acceleration
5. Disconnect the temperature sensor wiring and connect a 3 kΩ digital potentiometer. To do this, you can use the digital potentiometer VAG 1630.
6. Start the engine and set the idle mode, measure the current in the control circuit.
7. Quickly open the throttles, the current in the control circuit will briefly increase by 6 mA.
Cold start valve
8. See point 5.
9. Remove the cold start valve and position it above the measuring beaker (photo).
10. Operate the starter and check that the 'cone' of the injected aerosol is even.
11. Wipe the valve dry.
Throttle switches
12. Throttle switch 1 indicates the closed throttle position, and switch 2 indicates the fully open throttle position.
13. The inspection requires the use of special tools, so have this work done by an Audi dealer.
Diaphragm pressure sensor
14. Be guided Chapter 24, paragraphs 22-25.
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