Question1993 chrysler concord 3.3liter automatic,motor just stopped running no fire to plugs.replaced coil pack crank sensor cam sensor computers for car and transmission.checked 12vdc at coil and injectors is there when ignition is turned on but goes after a few seconds.compared this condition to a gm car and the 12vdc is on the injectors all time.(just a comparison with the gm)fuel pump starts and everything else appears fine wonder what is being over looked?thanks in advance Wayne
AnswerIf you get a code 11 that means that the crankshaft sensor is not getting its signal to the engine controller. Did the new one come with a paper spacer and did your push it in all the way until the tip touched the driveplate? If you get a code 54 that means the camshaft sensor signal is not getting to the engine controller. Same spacer needed and same installation concern to push it in until it touches the cam timing gear. Then hold each sensor in contact with their respective driveplate/timing gear and tighten the bolt to 105 inch pounds. And of course plug in the electrical connectors. The cut-off of the voltage to the coil suggests that one or the other of those sensors is not getting its signal to the engine controller, which automatically opens the autoshutdown relay after 1-2 seconds of cranking.
Roland
I should also mention that the code for a problem, once the problem is fixed, stay in the memory for 50-100 key on-off cycles. So it might be good to erase all the codes once you have read them out by disconecting the battery for 5 minutes, then try to restart the car, then re-read the codes and see what might be the most current read of the situation as seen by the engine controller. You will always get a new code 12 (battery disconnected recently) when you do the erase that way, but that is a given and need not be of concern. If you do all that and it still won't start becasue of the asd opening, then you would want to check that the wires to the sensors are patent all the way to the engine controller. I can gie you the pin assignments/color codes of all the wires if you want to try that.
Roland
Hi Wayne,
You have made a great effort so far. I think what is happening is that the autoshutdown relay is getting a signal to kill the power to the coil and the fuel pump for reasons yet to be determined, or the relay is bad (doubtful howerver because this 2 second shutdown is exactly the design behavior when the computer isn't happy with what it sees.)
There could be several reasons for this. But rather than guess may I suggest that you query the engine controller as to whether it has sensed any flaws (faults) in the engine sensors or actuators. Fortunately there is an on-board diagnostic capability that allows you to readout the engine controller to see if it has detected any problems in such sensors and in many other parts of the engine control system. Begin by doing a readout as follows: Take your ignition key and turn the ignition switch "on-off-on-off-on" and leave it "on". Do this switching quickly so that no more than 5 seconds elapses. Then watch the 'check engine' light to begin to flash, pause, flash, pause, etc. Count the number of flashes before each pause and make a note of them in the order that they come. The last two flash groups will be 5 in each. Repeat the readout until you have the numbers accurately (the same result, two times in a row). Then pair the numbers two at a time in the order they came, to form two-digit numbers, for example the last number will be 55 which is the code for "end of readout". Then write back and tell me the other numbers that came out and I'll see if any of them are related to your problem.
You can also get a code translation at:
http://www.allpar.com/fix/codes.html
but that is the starting point for a fix becasue the codes aren't specific as to exactly why.
Roland
