Yeah the 2-2-3 code means your IAC (Idle Air Controller) is screwing up for some reason. Could just need to be cleaned out with a good carb cleaner (Berryman's Chemtool Spray..... WalMart). They get gummed up after a while and start to stick. If you have access to Amsoil PowerFoam cleaner thats the best made, but absent that just use the Berryman's Chemtool. The IAC is that little metal motor valve with the 1" hose in and 1" hose out right there by your throttle body. It opens and closes to control the idle speed, circumventing around the throttle butterfly. The rest of this is a bunch of verbage out of the shop manual, but try cleaning it first.


Mike
'95 850T


Code 2-2-3 (Valve Signal Opening) or Code 2-4-5 (Valve Signal Closing)

1) If fault is permanent and signal is too high, go to next
step. If fault is permanent and signal is too low, go to step 4). If
fault is intermittent and signal is too high, go to step 8). If fault
is intermittent and signal is too low, go to step 9).

2) Turn ignition off. Disconnect IAC valve. Turn ignition on.
Connect voltmeter between ground and IAC valve connector terminal No.
3 (Code 2-2-3) or terminal No. 1 (Code 2-4-5). If voltmeter shows less
than one volt, go to next step. On Code 2-2-3, if voltmeter shows more
than one volt, check wiring between IAC valve connector terminal No. 3
and ECM terminal A11 for a short circuit to voltage. On Code 2-4-5, if
voltmeter shows more than one volt, check wiring between IAC valve
connector terminal No. 1 and ECM terminal A25 for a short circuit to
voltage.

3) Turn ignition off. Wait about 2 minutes. Disconnect IAC
valve. Connect an ohmmeter between IAC valve connector terminals No. 1
and 3. If ohmmeter reads 20-40 k/ohms, test using new IAC valve. If
ohmmeter shows about zero ohms, check wiring between IAC valve
connector terminal No. 3 and ECM terminal A11 for a short circuit to
wiring between IAC valve connector terminal No. 1 and ECM terminal
A25. If IAC valve signal wiring is shorted to each other, then both
Codes 2-2-3 and 2-4-5 will be set.

4) If fault is permanent and signal is too low, turn ignition
off. Disconnect IAC valve. Turn ignition on. Connect voltmeter between
IAC valve connector terminal No. 2 and ground. If voltmeter shows
battery voltage, go to next step. If voltmeter does not show battery
voltage, check wiring between main relay connector terminal No. 3 and
IAC valve connector terminal No. 2 for an open circuit. If there is an
open circuit in voltage lead, both Codes 2-2-3 and 2-4-5 will be set.

5) Turn ignition off. Wait about 2 minutes. Disconnect IAC
valve connector. Connect an ohmmeter between ground and IAC valve
connector terminal No. 3 (Code 2-2-3) or No. 1 (Code 2-4-5). If
ohmmeter reads 10-20 k/ohms, go to step 7). If ohmmeter reads infinite
resistance, go to next step. If ohmmeter shows about zero ohms, on
Code 2-2-3, check wiring between IAC valve connector terminal No. 3
and ECM terminal A11 for a short circuit to ground. On Code 2-4-5,
check wiring between IAC valve connector terminal No. 1 and ECM
terminal A25 for a short to ground.

6) Turn ignition off. Disconnect IAC valve connector. Ensure
ECM connector terminals are clean and tight, and free of oxidation.
Reconnect ECM connector. Connect an ohmmeter between ground and IAC
valve connector terminal No. 3 (Code 2-2-3) or terminal No. 1 (Code 2-
4-5). If ohmmeter reads 10-20 k/ohms, cause of code was poor contact
in ECM connector. If ohmmeter does not show 10-20 k/ohms, on Code 2-2-
3, check wiring between IAC valve connector terminal No. 3 and ECM
terminal A11 for an open circuit. On Code 2-4-5, check wiring between
IAC valve connector terminal No. 1 and ECM terminal A25 for an open
circuit.

7) Turn ignition off. Disconnect IAC valve. Connect ohmmeter
between IAC valve connector terminals No. 1 and 2, then between
terminals No. 2 and 3. If ohmmeter reads 9-14 ohms in both cases,
cause of code is poor contact in IAC valve connector. Repair as
necessary. If ohmmeter does not read 9-14 ohms in both cases, test
using new IAC valve.

8) If fault is intermittent and signal is too high, on Code
2-2-3, check wiring between IAC valve connector terminal No. 3 and ECM
terminal A11 for an intermittent short to voltage or intermittent
short circuit to coil signal voltage. On Code 2-4-5, check wiring
between IAC valve connector terminal No. 1 and ECM terminal A25 for an
intermittent short to voltage or intermittent short circuit to coil
signal voltage.

9) If fault is intermittent and signal is too low on Code 2-
4-5, go to next step. On Code 2-2-3, check IAC valve and ECM
connectors for contact resistance and oxidation. Repair as necessary.
Check wiring between main relay connector terminal No. 3 and IAC valve
connector terminal No. 2 for an intermittent open circuit. Also check
wiring between IAC valve connector terminal No. 3 and ECM terminal A11
for an intermittent open circuit or short circuit to ground.

10) On Code 2-4-5, check IAC valve and ECM connectors for
contact resistance and oxidation. Repair as necessary. Check wiring
between main relay connector terminal No. 3 and IAC valve connector
terminal No. 2 for an intermittent open circuit. Also check wiring
between IAC valve connector terminal No. 1 and ECM terminal A25 for an
intermittent open circuit or short circuit to ground.