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90 240 Crank Position Sensor - OBD Not flashing 200

OK-Yesterday I was driving home from an appointment, and the car just died. I did a quick check, no fuel pump (fuel pump relay not clicking during cranking-jumpered the fuel pump fuse and got the pumps running) and no spark (explains fuel pump relay not activating).

I figured it was the CPS since it's original (195K on the car). Also, I assume the car will start after it sat for a while if it was the CPS.

Towed the car home (only 5 blocks away from home).

So, as I waited for the car to cool down, I checked the OBD system. Both in pin #2 (fuel) and #6 (ignition). The LED lit up when I pushed the test button, but the system didn't give back any code flashes. I assume it was because the pins were dirty or corroded. Cleaned everything, still no code flashes.


I figured it was either a OBD box or something to do with the CPS.

I unplugged the CPS plug on the firewall and checked the resistance of the three pins. I got about 200 ohms between two pins (didn't bother to figure out which pins) and nothing between the other pins. The resistance between the two pins that gave a value would only read a value for a few seconds, than nothing. Have a new CPS ordered and will replace as soon as possible.

Well, after a couple of hours sitting, the car started right up. I checked the codes again, and the OBD system gave me codes for both ignition and fuel systems. Ignition gave me 1-1-1 - no faults detected, and fuel gave me 1-2-1 - faulty AMM (which I replaced and the code went to 1-1-1).

Question: Has anybody else seen no codes flashing in the OBD system when the CPS is going/went bad? Or is this a something else (like a sign of a bad ECU)?

Paul








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90 240 Crank Position Sensor - OBD Not flashing 200

typical crank sensor failure. a cup of cold water can revive a crank sensor in a pinch.

all the crank sensors i've replaced over the years, never saw anything but 111. east way to tell is no injector pulse AND no spark. that's always a bad crank sensor.








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90 240 Crank Position Sensor - OBD Not flashing 200

Hi Paul,

"Has anybody else seen no codes flashing in the OBD system ..."

I've had three cars with this leak:



If you washed the car or had rain before this occurred, check it out. Same sort of scenario. It would work again after it dried out some.
--
Art Benstein near Baltimore








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90 240 Crank Position Sensor - OBD Not flashing 200

Somebody mentioned that the OBD will not give codes if the fuel injector fuse near the battery is not powered (blown or corroded).

I checked it out. Yup-Pulled the fuse and was the same symptom:

-No fuel pump relay activating
-No spark
-OBD LED lights up when test button is pushed, but no code flashing in either the #2 or #6 pin.

I did clean the fuse and sprayed the holder and fuse with deoxit when I was cleaning the OBD box. I forgot to mention that. The car didn't run after I cleaned the OBD box and fuse holder. The fuse and holder was corroded. I'll replace the fuse and holder too.

Paul








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90 240 Crank Position Sensor - OBD Not flashing 200

Yup, that was me, cleanflametrap on turbobricks.

http://forums.turbobricks.com/showpost.php?p=6092516&postcount=6

I never tried using the OBD with the 25A fuse circuit open before, so I thought I'd give it a try this morning. That's the symptom.
--
Art Benstein near Baltimore








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90 240 Crank Position Sensor - OBD Not flashing 200

New CPS installed (yup, no white strip on the cable of the old one (I think that means it's original ->195K) and the cable was falling apart. Replaced it with a new genuine Volvo one.

I replaced the fuel injector fuse with a new one. Old one was corroded and even after I wire brushed it and sanded it, it did cleanup great (I'll keep it as a spare). Waiting on a new fuse holder to get here.

I definitely feel better knowing that the original CPS has been replaced and I have a new spare too.

Art-Thanks for the info on the fuse - nice bit of information for future diagnostic.

Paul








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90 240 Crank Position Sensor - OBD Not flashing 200

Hi,

How about the ignition power relay located behind the battery? I have three cars with them and have seen some good, bad and ugly with that little black box!

I have even taken the time to refurbish the heat sink paste on all of them. Those connection pins located inside the connector can get corroded as the connector itself is on the downhill side of the component. Since it sits in behind the battery, its one of those things that’s out of sight and out of your mind!

Oh well, that’s life! We get to live with somethings without knowing there was any other better choices and there may not have been any.

Technically it’s a very low maintenance item, except for the usual connector issues that every car has to have.

When you want neatness or accuracy you have to compromise something.
The CPS is even in a harder to reach area, someplace along the crankshaft and not be inside the engine! Ugh! V8 Toyota’s have their starters underneath the intake manifold.
Luckily a CPS has even fewer “ moving parts” electronic wise, and it still fails!
Considering the amount of times they have interacted with signals, we have to expect some minor inconvenience!

Our own bodies do the same things! Sure I have wished I had a third arm or extra hand, but I truly have no idea where I could put one and would be happy with it there! I keep thinking that the navel could be an accessory hole but where OR how would you carry any accessories? (:-) More hands? Nah!

Having pairs of almost everything is about right, because if I double up on the other single things, I would be in real serious trouble!

I’m definitely not over engineered, of which, is a good thing!

Phil










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90 240 Crank Position Sensor - OBD Not flashing 200

BTW-the car is a California emission car. Original ECU has been changed out with a non-problematic ECU.








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90 240 Crank Position Sensor - OBD Not flashing 200

My 91 245 stared shutting off while running. Never through a code, but trial and error proved it to be the crank position sensor. I'm now paranoid and at the first sign of trouble it is one of the first things I check.

Just a suggestion: Be careful it is very easy to over tighten and break the part where it bolts to the transmission housing. Smaller hands also help getting it started. I worked on it for hours, only to have my wife take like 5 minutes to get the bolt started.








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90 240 Crank Position Sensor - OBD Not flashing 200

meant "threw a code" but it won't let me edit the post. Continual error message







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