240 Wagon Ignition Module
 

Hi there

Is there any trick to getting the right ignition module for a 1989 240 wagon auto 2.3, we think we have a failed one and 2 other units have not worked properly, is there a unique module or something we have to use?

Thanks

how do you know its the module thats bad? have you tested its input and output with a volt meter while cranking?

power module for a 89+ 240 is Volvo 3501921, which is Bosch 0-227-100-124.

This also fits most all 740,940's (anything with LH injection and bosch ignition, anyways) (older 240's had Chrysler ignition and didn't use a power module).

it has 5 pins. ground is pin 2, power in is pin 4. pin 5 is pulsed by the ICU to fire the spark, 3 is the shield around this low level input signal. pin 1 goes to pin 1 on the coil and fires the coil by grounding it when told by pin 5.

so I'd put a LED test light on pin 5 to ground, and crank the car and make sure you see blinks... make sure there's full power on pin 4.

p.s. they get pretty warm when running, its a good idea to clean the metal surface they are mounted on, and use some computer heat sink compound between the module and the metal surface, this way they stay cooler. don't use a lot of compound, just a little dab that will spread real thin when its bolted down.

I went a step ahead and actually mounted a computer heart sync to mine. I did it because someone put Bondo on the metal where it mounts causing it to be more of an insulator