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  1. It means you have an open between the 12V supply...

    It means you have an open between the 12V supply line from the fuse to ground, it could be the 12V line to the headlight bulb connector between the fuse box and headlight connector, the bulb itself...
  2. Connect one lead of the multimeter to ground and...

    Connect one lead of the multimeter to ground and then check for 12V with the other multimeter lead connected to either of the two fuse contacts (fuse 17) with the fuse pulled. If your splice or bulb...
  3. Power to the headlights comes from a relay the...

    Power to the headlights comes from a relay the CEM controls and goes to the fuse box in the engine compartment on a single line 15/22:1 and this single line provides powers both fuses 17 and 18....
  4. The engine cutting out as described in your first...

    The engine cutting out as described in your first post and this no start symptom are not likely CEM related in my opinion. I still think there's an intermittent power problem to one of more of the...
  5. This is a power problem, battery, ignition...

    This is a power problem, battery, ignition switch, power distribution through the engine compartment fuse box. I can't post a diagram but there are 60A power distribution fuse circuits in the engine...
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    I could be wrong but I seem to recall seeing a...

    I could be wrong but I seem to recall seeing a couple of messages once so I think the message system can store and display more than one message.
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    There's no reset and it doesn't require any drive...

    There's no reset and it doesn't require any drive cycles to clear. The way the bulb failure circuit works is current flow through a shunt, which is a low resistance resistor, and an expected voltage...
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    Blowing air into the oil filler with a vacuum...

    Blowing air into the oil filler with a vacuum cleaner is a good idea as long as the air is clean and you've confirmed there's not a complete blockage in the long line. Did you also check with the...
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    I've read the PTC is sized to meter a known...

    I've read the PTC is sized to meter a known amount of air because it is after the MAF sensor so there has to be a way for the ECM to account for a known amount of air being supplied past the MAF....
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    The short hose from the manifold attaches to the...

    The short hose from the manifold attaches to the elbow of the long hose above the oil trap, the elbow connects the long hose to the oil trap. The short, small diameter hose does provide PCV vacuum...
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    The post referenced about the long tube being...

    The post referenced about the long tube being clogged is also the hose/tube I thought could potentially be clogged and could be causing the high vacuum. This is why I thought looking at the PTC...
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    From the photo the PTC opening does look clean....

    From the photo the PTC opening does look clean. As I recall this was a decent size opening and the PTC area in my car was clean too even after 125K miles. I'm not sure what else may be causing too...
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    One theory I have is the PTC nipple could be...

    One theory I have is the PTC nipple could be clogged and this may allow too much vacuum to build up during idle or low loads. The PTC is located in the air intake tube down near the inlet of the...
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    I can't see how the passage to the oil sump would...

    I can't see how the passage to the oil sump would create too much vacuum in the crankcase even if blocked. I think this is just speculation by a tech that doesn't understand the PCV system very well....
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    Since I can attach a photo follow this link to...

    Since I can attach a photo follow this link to see a good diagram of the PCV system.

    https://www.matthewsvolvosite.com/forums/viewtopic.php?t=60728


    With this PCV system there are two sources...
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    One thing you can do to check if the anchor bolt...

    One thing you can do to check if the anchor bolt was removed, without removing it again, is to check the band movement through the servo. You remove the servo cover, leave the servo piston in place...
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    If you're seeing debris in the fuel from the fuel...

    If you're seeing debris in the fuel from the fuel rail I would suspect you might have clogged fuel injector filters. These filters are small (see photo) and any amount of debris seen in the fuel...
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    The battery may have been bad but was it due to...

    The battery may have been bad but was it due to the parasitic draw every day/night the car wasn't running? Did you recheck the current draw with the new battery installed? If the battery was in a...
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    I'm not sure disconnecting the cable at the...

    I'm not sure disconnecting the cable at the jumper post disconnects the alternator and also starter motor. According to the wiring diagram I have the 12V bat connection goes directly to the...
  20. Yes, the pins are to keep the valve body aligned...

    Yes, the pins are to keep the valve body aligned and from moving around, which can dislodge the seals. I remember I had my doubts too about the sealing rings staying position, what I did was to...
  21. When you install the valve body back in the...

    When you install the valve body back in the transmission be sure the two sealing rings stay in place. Some say you can use Vaseline to hold them in place (transmission case) but it's better to use...
  22. No circlip, once the plate is removed the valve...

    No circlip, once the plate is removed the valve should slide out. You could turn the valve body and let gravity and tapping on the VB to help you out. Be careful not lose any of the parts from the...
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    I agree it would be best to send the injectors in...

    I agree it would be best to send the injectors in to get cleaned and tested but if one doesn't have the time to send them off or the money you can replace the seals and the filters yourself. I just...
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    In addition to the pdf instructions Xfingers...

    In addition to the pdf instructions Xfingers pointed you to I'll add a couple of tips based on doing this job a couple of times. You don't have to remove the crankshaft pulley. There's a plastic...
  25. Here is a great deal of valuable information in...

    Here is a great deal of valuable information in one place. Thanks Astro14
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