240 ignition coil wiring
#1
#2
assuming that's using a conventional bosch cylindrical coil, the two side terminals on the coil should be labeled '15' and '1'. pin 15 goes to ignition switched power wire (typically blue), and pin 1 goes to the ignition power module, and the tachometer if you have one (typically white/red).
#3
#4
hook a 12V test lamp to coil pin 1 and ground, crank engine, does the light blink? if it does, you /should/ be getting spark, if it doesn't, then check the ignition power module, this is a little 5 pin module thats on the left fender (at least, thats where it was on my 1992 740T). I don't have the wiring diagrams in front of me right now, but the coil pin 1 comes off that module, and there's an input to the module that comes from the ICU (Ignition Control Unit, which is under the dashboard on LH 2.4 cars). if you can determine what pin that input is, slip a thin bare wire around that pin, so you can read it while its plugged in, you should get blinks on your test light there when cranking. if you have blinks there, but not on coil pin 1, that power module may be bad. if there are no blinks on the input, then its time to look at the crank position sensor, and the ICU.
#5
hook a 12V test lamp to coil pin 1 and ground, crank engine, does the light blink? if it does, you /should/ be getting spark, if it doesn't, then check the ignition power module, this is a little 5 pin module thats on the left fender (at least, thats where it was on my 1992 740T). I don't have the wiring diagrams in front of me right now, but the coil pin 1 comes off that module, and there's an input to the module that comes from the ICU (Ignition Control Unit, which is under the dashboard on LH 2.4 cars). if you can determine what pin that input is, slip a thin bare wire around that pin, so you can read it while its plugged in, you should get blinks on your test light there when cranking. if you have blinks there, but not on coil pin 1, that power module may be bad. if there are no blinks on the input, then its time to look at the crank position sensor, and the ICU.
- Thanks for the assistance. I have now replaced the power module, cam shaft sensor and the icu, I have continuity between coil and power module, on both pin 1 and 4, I have continuity between icu and power module, I have 12v from ignition to coil, any clues where to go next, thanks Candy...
#6
#7
#8
its a CRANKshaft sensor, not camshaft. yes, SOME cars (my 1993 Mercedes 300CE for instance) have a camshaft sensor also, but these Volvos never got one. pretty much every car I've seen with a cam sensor has coil over ignition and/or sequential fuel injection, and also variable valve timing.
#9
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montysano
Volvo 240, 740 & 940
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04-25-2007 11:14 PM