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Found this searching for info on trouble shooting the IAC and/or Oxygen sensor. This wins for my favorite post on any Honda forum yet, huge help. Thank you!!You can get some basic diagnostics using a Service Check Connector that plugs into the 4-prog red outlet that's under the electronics cover on your engine. Part number 070PZ-ZY30100 - it's about $20.00 online. That allows you to retrieve fault codes from the EPROM in the on-board engine computer - the Electronic Control Module or ECM.
Takeoff the engine cover and the plastic cover over the electronics on the front of the engine. There you will see a red four-pronged female plug. That's where the service check connector plugs in. Alternatively, you can use a paper clip to shunt the lime green/white wire to the black wire – that is, the two wires that are closest to the engine when the red service connector is correctly set in it’s holder. If in doubt, invest in a SCS service connector.
If the MIL comes on, then goes off after a few seconds, there are no codes in the EPROM.
If the MIL starts blinking, then count the blinks, which will indicate the fault code. You may get long blinks and short blinks. For example, two long blinks,followed by five short blinks, would be a fault code 25. The blink sequence will repeat itself until you turn the key off. If there is more than one fault, you will get multiple fault codes. For example, three short blinks, followed by two long blinks and five shortblinks would be fault codes 3 and 25. If you do not have a shop manual, send me an e-mail at [email protected]and I will send you the codes. I blieve the fault codes for the 150 and the 225 are the same.
The grommets need to be replaced, they are cracked and broken. Just looking at their condition and reading your response tells me this is yet another possibility. I have new ones waiting to be installed, they'll go on tomorrow too.When these engines start running crappy, the first thing you typically should do is pull and change the high-pressure fuel filter. Those things deteriorate by just sitting there.
Also, remove the top cover there the fuel line and cables enter the engine compartment through that big black grommet. It is not unusual at all for corrosion to build up in there and restrict the fuel line.
Not sure if this matters, but none of the red lights are lit when turning the key before firing up the engine. It does briefly light before the engine dies with a short beep. Both fuel filters with new water collection reservoirs are installed, not starting at all.When these engines start running crappy, the first thing you typically should do is pull and change the high-pressure fuel filter. Those things deteriorate by just sitting there.
Also, remove the top cover there the fuel line and cables enter the engine compartment through that big black grommet. It is not unusual at all for corrosion to build up in there and restrict the fuel line.
BTW - if this is all getting to you, Whalen's Matina in Farnham has some top-notch Honda techs. Not cheap, but quite good at what they do. It's not far north of Kilmarnock off Virginia Route 3.When you first turn on the key switch, you should hear two beeps and all four lights on the key switch panel should come on briefly. Then the alternator light should stay on until you start the engine. The alternator light should then go off and the green oil pressure light should come on. Is that not happening? If not, then you likely have a problem in the wiring harness to the console, or an ECU problem. The wiring harness has a 7.5-amp fuse in it. Check that first. See the attached.
When you first turn on the key switch, you should hear two beeps and all four lights on the key switch panel should come on briefly. Then the alternator light should stay on until you start the engine. The alternator light should then go off and the green oil pressure light should come on. Is that not happening? If not, then you likely have a problem in the wiring harness to the console, or an ECU problem. The wiring harness has a 7.5-amp fuse in it. Check that first. See the attach
Thanks, I was just there and bought the IAC from you all. That Ray, he's a sweetheart. Thanks!BTW - if this is all getting to you, Whalen's Matina in Farnham has some top-notch Honda techs. Not cheap, but quite good at what they do. It's not far north of Kilmarnock off Virginia Route 3.
Keith Whelan
Whelan’s Marina
3993 Hales Point Road
Farnham, VA 22460-2004
(804) 394-9511
[email protected]