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P1211,P1212

Symptom: Idle uneven, slow or fast

P1211 , P1212

Idle air control valve (IAC), output from control module low/high, no continuity or shorting to ground/batt+


Fault symptom

Idle uneven, slow or fast

Condition

No continuity or shorting to ground/batt+ in the circuit to pin 4.

Diagnostic procedure


1. Activate the ISAT commands "CALC. AIR MASS" and "ACTUAL AIR MASS" in the "READ FUNCTIONS" menu or activate the ISAT command "IAC VALVE" in the "ACTIVATE" menu and listen to check whether the valve is working. (0.5 Hz).

If it is, proceed to point 3.

2. With the ignition switch in the Drive position, unplug the IAC valve connector and check whether current is present on pin 2 of the IAC valve.


If it is not, check the lead between pin 2 of the valve and fuse 17 for continuity/shorting.

3. Measure the resistance across pins 1 and 2 of the valve.



The resistance should be 6-10 ohms. If it is not, change the IAC valve.

4. Start the engine and check the voltage across pins 1 and 2 of the connector.


With the engine running at idling speed, the voltage across pins 1 and 2 should be about 5-7 V. (The frequency should be 100 Hz.)

If correct readings are obtained, check the valve manually for binding. If the valve is OK, proceed to point 6.

If incorrect readings are obtained, continue as described below.

5. Check the lead between pin 1 of the IAC valve and pin 4 of the MOTRONIC control module for continuity/shorting.


6. Clear all the trouble codes and drive the car on the road to check whether any codes are generated afresh. If they are, turn to for further diagnostic instructions.