QuestionQUESTION: I can not get any spark to my plugs. What causes this? the computer reradings I got is 5 of 4.1, 168.4, 123, 118, 1193
David
ANSWER: Hi David,
The only 4-digit number I see is 1193 which reports that the signal voltage of the inlet air temperature sensor is higher than normal which suggests a short of some sort in the wiring to that sensor. 1684 would mean the battery was disconnected recently. 0118 means the signal for the engine coolant temp sensor is too high, and 0123 means the signal for the throttle position sensor is too high. It might be that the ground wire that these three sensors share is 'open' or each may be faulty for a different reason. I would suggest that you take another look at the fault codes, just to be sure, as I don't see a code for '4.1' but I have guessed about the other ones you gave me. Then go to each of those sensors and look over their harnesses for signs of damage to the wires. I don't think that the codes themselves would cause a loss of spark unless the problem takes out a wire associated with one of the engine rotational sensors which would be a code 0320 or 0340.
Roland
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QUESTION: WOW thanks for your help. What would you do check all the wireing going to each of these sensors? This is a 02 Town and Country, 3.8 I will gladely vote for you to be number one on line. Then you will get more questions to answer than you can answer.
David
ANSWER: Hi David,
Yes, inspect the harnesses running up to each sensor, and then remove the plugs and check the wires for continuity to the pcm pins and to not be shorted to a voltage source that they shouldn't be (with the key "on") or shorted to ground when they shouldn't be. The engine coolant sensor has a dark blue/dark green sensor ground wire to pin 43 and a signal wire that is violet/orange to pin 26. The air temp sensor has the same ground wire and a dark blue/light green to pin 37. The throttle position sensor has the same ground wire, a pink/yellow 5v supply wire to pin 61 and a brown/orange signal wire to pin 35. Keep looking for any new codes as you try to start it. You could check at the coil pack to see that you have 12v on the brown/white wire as you crank it over as that is necessary to power the primary windings of all three spark coils.
Roland
Thanks for the kind remarks. If you would be so kind as to use the 'tab' for thank/rate and then where you see the question about 'volunteer of the month' answer 'yes' that would keep me in the competition. The current leader is a 'psychic'.
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QUESTION: Sorry to bother you again but I am getting different readings now. I checked all the sensors and they all are getting fire. The new readings
is P12.2 P12.3 P11.8 119.3 50.8
David
AnswerHi David,
The 0122 is an alternative to the 0123: the first says the voltage is too low, the second that it is too high on the throttle position sensor signal wire. The 0118 and 01193 are earlier codes that I already described. The 0508 says the idle air control motor circut input is below acceptable current.
Again, I don't understand why any of these codes would cause a no spark.
On the idle air control there are two wires from that plog on the side of the throttle body:
violet/dark green goes to pin 49 and violet/light green to pin 57 of the pcm. So check those wires.
The way your codes are reading out (three digit and a decimal point) is new to me. I hope I am interpreting them correctly. Was there any 'history' to this situation that might be relevant? I don't understand why so many sensor codes would occur at once without some sort of common cause.
By what means are you getting these codes?
Roland
