QuestionQUESTION: The switch got shorted by someone trying to get the compressor to come on by bypassing it. I now have the following codes retrieved from the digital display; p0123, p1684, p0118, p1598, p1193. I did replace the battery several weeks ago and also disconected the battery trying to reset the PCM. There is no power going to the coil pack or the TPS. I checked them according to th Haynes manual. I have also checked the relays and fuses in the IPM all are good. Are there any fuseable links that could be blown? I'm in desperate need of an answer soon. this is my only car and so now have no way to work or to take my kids to school, doctor, etc. PLease help! THank you.
ANSWER: Hi William,
Start by looking at fuse 18 and fuse 23 in the ipm as those are the ones involved with the ac clutch relay circuit. I will look over the codes and see what I can find and get back to you. Can you be more specific about which "AC clutch cycling switch" was trying to be by-passed and exactly what was the technique that was tried when things went wrong? Do you mean the clutch relay or do you mean the AC pressure sensor switch? That switch operates on a 5 volt supply that comes out of the pcm so perhaps if 12v was jumped to it that blew out the 5v supply. Four of the codes speak about the ect, tps, a/c pressure and inlet air sensors having 'too high' a voltage, and the tps and a/c sensors do need that 5 volt supply. Do you hear the fuel pump run for about 1 second when you switch the ignition to 'run', which is what it should do normally. Also the power to the coil pack is 'on' for just a second in the same way. The power to the coil pack (and fuel pump)should return when you move the key to the start position and remain as long as you are cranking it, so see if that is true or not.
Roland
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QUESTION: First thank you for responding so quickly! No, there isn't any power going to the coil pack when switch is turned on. yes i can hear the fuel pump. The AC pressure switch is what it was. Has 3 wires. If the 5volt supply is blown can that be fixed or will the whole PCM need to be replaced?
ANSWER: Hi William,
The curent for the coil comes from fuse 16 so check that, and then the current goes thru the automatic shut down relay to the coil. That relay may not be getting the signal to close.
If you go to the automatic shotdown relay, very front of the icm, sligthly inboard of center, try jumping from the inboard rear pin (30) of the socket to the outboard front pin (87) of the socket of the ASD (after removing the ASD) which will by-pass the ASD temporarily and provide power to coil, the fuel injectors, pcm, and the alternator. Then try and start it.
I can't decide whether the 5v is blown yet, but it is provided by the pcm and that is not something that is repairable because of the way it is constructed, I believe. But first let see if the 5v is lost or not.
Roland
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QUESTION: bridged relay circuit and it still doesn't start. There was power at both end of the circuit though. Now other things are starting to happen, like the instument console is delayed goig off after key is turned off and removed. DVD player running even without a disc. No sound coming out of radio?! Again thanks, this is bad huh?
AnswerHi William,
Did you put the ASD relay back in its socket? That might explain the gauges remaining on.
The CD is powered out of the radio which in turn is powered out of the accessory relay which should be "off" when the key is off which is sensed via the control of the front module of the icm. I wouldn't worry about that issue for now.
Did you get spark with the ASD relay spocket jumped?
Also, try disconnecting the battery which will erase the codes, then reconnect in a couple of minutes and try starting it again. And then see what codes you show.
Also check to see if you have 5v with the key in the run position at: pink/yellow wire at pin 3 of tps, or pin 3 if the MAP sensor, or pin 2 of the a/c pressure sensor plugs. While at it, check for 8v black/pink wire of pin 1 or crank sensor, pin 1 of the cam sensor which ever is accessible more easily, again with the switch in the run position. We should verify the presence or absence of those voltage supplies.
Roland
