|
Very nice description of IAC cleaning. I could feel that magnet trying to unsteady the hand as you fit it together!
You pose a couple of questions:
1. Not being able to disengage the idle motor using the test point. Can you verify the harness is actually grounding ECU pin 12? This is actually the same circuit as the WOT switch on the TPS. Edit: pin 15? There's a discrepancy between the LH2.2 manual and later wiring diagrams. I expect it really should go to 15, as it does on the LH2.0.
2. Not being able to see O2 sensor transitions on the test point. Can you verify harness is actually connected to ECU pin 22? The circuitry is rather reliable and midpoint in the flow, i.e. if there was a problem with the logic flow, the ECU would not enter closed loop. But yes, others have reported this trouble on LH2.2 700 cars. I wonder why the color code for these two wires is so different from that on the 200 cars? Could the wires be reversed in function? Hint - backbrobe the AMM pot wire pin 6 with a voltmeter to use as reference while adjusting-- your goal is 50% switching of the 02 sensor, and thus the LED test point.
3. Memory? Not on LH2.2. No adapting, no storage after the key is turned off.
Nice work and good feedback, Noel.
--
Art Benstein near Baltimore
|
