Volvo Troubleshooting Questions? Ask a Mechanic for Answers ASAP
There is no signal on terminal 4. There is only a steady signal on terminal 3.
Not sure if I'm doing it correctly... I pulled out the ECM and checked for continuity between terminal #11 in the ECM socket and terminal #4 in the connector that I unplugged from the ignition coil bracket. There's no connection (open).
Does that indicate that the wire running from the ECM to the coil is broken? If so, what would be the best fix?
I hooked up a wire to terminal #11 on the ECM module that's close to the fender and did not get any signal.
I then traced the wire from terminal #4 on the ignition coil all the way to to the socket for... the other ECM, not the one close to fender but the one away from the fender. That wire is OK and so there's no signal coming out of ECM.
I guess the next step would be to check if the ECM is getting an input signal from the pick-up coil (?) or some other sensor (?). Is item 4/46 on th electrical diagram you sent me the ECM? Which wire on the diagram provides the timing signal to the ECM that triggers the pulse to the coil?
Can you send me some kind of legend for the schematic that would tell me what the different devices are? Is the schematic you sent me complete?