2004 v70 Cold starting problem

[DGM]

I checked pins on the sensor and found:
With ignition off Pin 2 reads to ground. Pins 1 & 3 show nothing
With ignition on (position 2)
Pin 1 5V
Pin 2 ground
Pin 3 5V

Shouldn’t Pin 1 be ground and at least Pin 2 or 3 be 12 V?
I also found the continuity from Pin 1 to terminal A29, Pin 2 to A65, and Pin 3 to A27. Nothing seemed shorted out. With the ECM removed nothing is going to ground. Any thoughts out there? My next step is to replace the ECM. The ECM is a Bosch 0261207392 26SA0000 1111

As per the wiring diagram, Pin 2 is a solid black wire (SB) which indicates a reference to ground. Pin 1 is a red wire (R). It is the supply voltage by the ECM (5V). Pin 3 (BL/SB) is the signal wire back to the ECM. Readings could be normal with ignition on, engine not running.

See the following video for testing.



If your signal voltage stay at 5V, the only thing I could think is a cross between 1 & 3 in the wiring or in the plug which would create no variation in the signal or the sensor itself.

How is the inside of the housing where the sensor is mounted. Any dirt or oil contamination that could affect sensor operation (end gaps)?

Normally sensor operation is tested with a scope.

Also this video showing what is involved in testing these sensors. This video is specific to a crank sensor on a Chrysler but the same principle apply here.

[Buckone]

I wanted to thank DGM for the video links. Very helpful. I checked the camshaft sensor and found that it was fine. I got 5V, ground, and a pulsing 5V (watch the video). I drove the car for a couple of days and started to notice a little pulse in the engine after it would start. It would go away after a minute or two and run smoothly. Driving home from work Friday I got on an Interstate and sped up to 65mph. Noticed that it just didn't have "pep". I went to pass someone and really noticed it. When I got off the Interstate the engine started knocking on the ramp and then died at the stop sign. Engine would crank but not fire. I hate to say it, but it's off to a dealership to diagnose now. I'll keep you posted....

[Buckone]

I finally got my car back from the dealership after 3 weeks. They basically checked everything that I already had, replaced my new spark plugs with their new spark plugs, and told me the ECM was not seeing the cam shaft position sensor (makes the ECM think the timing belt is broken). They said I needed a new ECM. The sensor itself was O.K. They only charged me a couple hundred for their time and agreed that in the name of cost having a third party program an ECM was a good idea. I sent the unit to Xemodex who programmed a good ECM and tested it. I got it back, installed it, and still no luck. The engine will not start. It's not throwing any codes now. So, I'm left with a 2002 S60 AWD in nearly mint condition that won't run. I would think I would at least get the car to fire a little, but nothing. I'm going to check the ignition coil(s) with a spare spark plug to see if I see anything. Any other suggestions would be greatly appreciated. I will add, that it's still cold outside. Surely this wouldn't keep it from totally not starting????

[Buckone]

I started a separate post on my problem, but I thought I would follow up on what I started here. I've got my no start problem solved. It ended up being the crankshaft timing belt pulley had stripped out. Very odd. Luckily the crankshaft was fine and the valves didn't get bent.

[oragex]

Good to hear!

[rachwalj]

I started a separate post on my problem, but I thought I would follow up on what I started here. I've got my no start problem solved. It ended up being the crankshaft timing belt pulley had stripped out. Very odd. Luckily the crankshaft was fine and the valves didn't get bent.

I know this is an old thread, but you saved my car and this could help save someone else's car! We locked the cam gears and performed the timing procedure about 3.2 million times. Never could get it right. We tried moving forward one tooth on both cams and we got it running... It was sluggish, but driveable. First clue that wouldn't help me until about a year later.

We replaced the camshaft sensor, the crankshaft sensor, tensioner pulley, belt, VVT-I, camshaft gear. We bought the VADIS tool online. We ran new wires from the computer directly to the camshaft sensor, just to eliminate all the posibilities. We ran ohm tests on the sensors, cabling, ecu wiring paths. Etc. I even had my ECU reflashed by Xemodex. Nothing solved this and the car sat in my back garage for about 6 months. My 15 year old son decided since he was home from school that he "was going to solve" this issue. I said, "have at it kid, many a good mechanic has been unable to figure it out." My brother, who is an L1 master mechanic didn't figure this one out either. None of them or anyone else I know (who knows cars) have ever seen the crankshaft pulley strip.

Anyway, since he was doing this, I figured I'd search the interwebs again; and I came across your post while researching the crankshaft pulley (as it was really the only remaining possibility) and immediately knew I had to tear it down with him. Sure enough when we pulled off the outer gear for the accessory belt, that STUPID gear had play in it. I couldn't spin it in place with any amount of force, but it was "jiggly". We pulled it an sure enough, COMPLETELY stripped internally. Exactly like your pictures and the others out there on the internet.

If you've tried everything to solve your camshaft code (ECM-3000 or P0340) and have had no luck... Pull the accessory belt pulley off and have a look. There are about 5 confirmed cases of this now on the internet.

Thankfully the camshaft splines are fine, so off to the interwebs I go to order new parts.

[Botbasher]

I have never seen anything like that and I've been playing with cars since I was way too young to drive!!

Do you happen to have any pics of this damage?

I'm wondering if there isn't some underlying problem that causes this (as there are so few it's probably not design issue), such as mis-firing causing a backlash through the cam drive system damaging the splines. The belt might be stretching slightly when VVT is active giving it leverage and sling-shotting it forwards after a mis-fire, in effect jackhammering it into failure.

The root problem never gets discovered because the cause is corrected (VVT failure, coil packs, plugs, fuel, wiring....) in the hunt for the correction (Problem goes away for a while, but comes back), but the terminal damage is already done and the eventual failure is certain.

I hope I never face the issue, but as many have found... MVS is an awesome repository of knowledge for today's issues and tomorrows solutions! Thanks Matt!!!

K "greatful" S

[jonesg]

I had a toyota van that spun the crank pulley, soon afterwards the valves needed doing.
But I sold it to a mechanic, he said he spent $800 in parts alone.

[rachwalj]

I have never seen anything like that and I've been playing with cars since I was way too young to drive!!

Do you happen to have any pics of this damage?

I'm wondering if there isn't some underlying problem that causes this (as there are so few it's probably not design issue), such as mis-firing causing a backlash through the cam drive system damaging the splines. The belt might be stretching slightly when VVT is active giving it leverage and sling-shotting it forwards after a mis-fire, in effect jackhammering it into failure.

The root problem never gets discovered because the cause is corrected (VVT failure, coil packs, plugs, fuel, wiring....) in the hunt for the correction (Problem goes away for a while, but comes back), but the terminal damage is already done and the eventual failure is certain.

I hope I never face the issue, but as many have found... MVS is an awesome repository of knowledge for today's issues and tomorrows solutions! Thanks Matt!!!

K "greatful" S

My pictures are almost identical to the ones in this thread, here you go:
https://photos.app.goo.gl/pQQZEVQe9DSTQhDz1

I too have NEVER seen anything like this. I've been wrenching a long time as well. Thank God for these forums and great posters...