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crank sensor, same as rpm sensor?? help?

crank sensor, same as rpm sensor?? help?

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  #1  
Old 02-19-2012, 06:45 AM
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Default crank sensor, same as rpm sensor?? help?

For almost 2 months ago now, i fixed my rpm sensor because i got faultcode : 1-3-1: Ignition system RPM signal missing

Now i got : 2-1-4: Crankshaft position/speed sensor faulty.

Dont tell me that this is the same sensor?

Got a volvo 740, 89mod, b230f engine.

thanks for any help
 
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Old 02-19-2012, 07:12 AM
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Originally Posted by Gullfisk View Post
For almost 2 months ago now, i fixed my rpm sensor because i got faultcode : 1-3-1: Ignition system RPM signal missing

Now i got : 2-1-4: Crankshaft position/speed sensor faulty.

Dont tell me that this is the same sensor?

Got a volvo 740, 89mod, b230f engine.

thanks for any help
The crank sensor is located on the top of the back of the motor. Look below the distributor cap on the driver side of the car. It is on top of the bell housing and held on with 1 bolt. It is different then the RPM signal.
 
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Old 02-19-2012, 10:19 AM
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Default re

Originally Posted by jagtoes View Post
The crank sensor is located on the top of the back of the motor. Look below the distributor cap on the driver side of the car. It is on top of the bell housing and held on with 1 bolt. It is different then the RPM signal.
Would a picture bee to hard to find?? thanks for the help
 
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Old 02-20-2012, 10:06 PM
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Here's the notch in the bell housing
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Here's the sensor circled...
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And this shows the long pig tail connector
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Old 02-21-2012, 09:56 AM
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Default well im confused

Originally Posted by swiftjustice44 View Post
Here's the notch in the bell housing

Here's the sensor circled...

And this shows the long pig tail connector

here is a post i made 2 months ago, and these picture you have shown me are identical to the photos from the rpm sensor post?

So some of you gotta be wrong here, because 2 months ago i got fault code 1-3-1 (rpm sensor, wich Swiftjustice helped me with in my other post) and now i got 2-1-4 (wich im not sure anymore what is any more)

Here is the link for the other post: https://volvoforums.com/forum/volvo-...36/#post299994
 
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Old 02-21-2012, 12:23 PM
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Yup, the pictures are the same. 214 is an erratic rpm signal. Most often, this is because the sensor is either loose and wiggling around, or the bracket that the sensor mounts to is just too tall. Occasionally, I've had to grind the pot metal bracket down a bit to get the entire assembly closer to the flexplate/flywheel dimples. I've had a bit of experience with this as I converted a flat, pre 87 flywheel without dimples to dimples to work on my 89 245...I did it by using a flexplate from an auto car and using it as a template to drill the dimples...
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Old 02-21-2012, 12:34 PM
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The 2-1-4 code is for the regina system which you don't have. The RPM sensor is what swift has in his pictures. I thought you were referring to the speed sensor which is the feed to the speedometer and ECU. It still sounds like you have a problem with the rpm sensor as shown in the pictures. I would clean the connector and check to see if it is functioning.
 
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Old 02-21-2012, 01:14 PM
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JT, I'd have to disagree that the code is specific to Reginas...I fought this code with my 245 when I used the converted flywheel. The diameter of the flywheel is .5 inches less than called for and the crank sensor was too far from the wheel. I had to grind down the top side of the sensor holder Name:  100_0295.jpg
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Size:  23.7 KB so the sensor would sit deeper and thus closer to the flywheel. It took me a couple of tries to get rid of the code.
Regardless, either the holder, sensor or connector is most likely loose.
 
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Old 02-22-2012, 09:43 AM
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ok, im not following you guys 100% here. But i i'll try to ask a other way.

131 is the rpm sensor and 214 is the crank sensor, i cant find any answers that tells me the difference?

Does any body know the symptoms for fault code 2-1-4?? Because my volvo loose all power around 2000-3000 rpm?? Is 2-1-4 the reason for this?
 
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Old 02-22-2012, 10:02 AM
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131 is the ignition system rpm signal, i.e. the ICU which can and will pull timing is not receiving a signal...generally because of either a bad sensor or bad connection. 214 is an erratic signal being received. For me, that meant the sensor was just a bit too far from the dimples it reads. Check the pig tail on the sensor...look closely at the pins in both sides of the connector. Look for bent or corroded pins. If nothing, then make certain the 10mm bolt holding it to the bracket is tight. If it is tight, then see if the two bolts holding the bracket to the block are tight. Other options are that it could be a bad connection at the ecu or, less likely, the icu. You may very well need to drag out a digital volt meter and start checking at the ecu if it isn't a simple connection issue. Also...even though a crank sensor is a simple item, it is not unusual for new and like new parts to fail these days, given the lack of quality of the usual manufacturing country.
 
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Old 09-18-2014, 07:21 PM
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So I have a volvo 740 GLE 1986, not sure of the motor, the sticker is missing. I tried to find the Crankshaft Sensor on top of the Bell housing below the distributor cap but I cannot find the RPM sensor. I am trying to locate it because it was malfunctioning for a while and then stopped working completely, I tried putting a new cluster in and it still didn't react, so now I suspect the sensor. Any idea where else this thing could be located?
 
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Old 09-18-2014, 07:28 PM
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a 1986 is LH2.2, and uses a hall sensor in the distributor. crank position sensors were used with LH 2.4 injection, for 1989+ (1990+ turbos).
 
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Old 09-18-2014, 07:35 PM
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ok, cluster... so you're saying your tachometer isn't working?

the tachometer is connected to the ignition power module pin 1 which also goes to pin 1 on the coil via a red-white wire... unless you have a 'rex' ignition system, then its connected to pin C of the left connector to the power/module/coil hybrid, allso via a red/white wire.
 
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Old 09-18-2014, 08:21 PM
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Yes, the tachometer is what I was trying to describe. The engine is a B230F. I checked the ignition coil and it only has 2 white and 1 blue wire coming out. THANK YOU PIERCE for helping me figure this out. It looks like I have to remove the distributor cap, pull of the rotor and on and on. Anyone know good volvo mechanic who knows old volvos in Long Island, NY?


http://i123.photobucket.com/albums/o...03973913_o.jpg
 

Last edited by hlcynik; 09-18-2014 at 08:49 PM.
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Old 09-18-2014, 09:07 PM
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at the coil, pin 15 should only have 1 blue wire, thats power from the ignition switch.

coil pin 1 can have one or more white wires with thin red stripes. these go to the ICU (Bosch ignition control unit), the tachometer. and, maybe the fuel pump relay/control... but these mutliple things canb e sliced somewhere other than at the coil.


check that 2nd white wire carefully, does it have a faded red stripe? if so, move it to the other side of the coil, and see if that doesn't fix your tach.
 
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Old 09-18-2014, 09:39 PM
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The thing is I looked under the distribution cap with a flashlight and found where the impulse sensor plug protrudes and it is clearly hanging loose, which it shouldn't. So that explains why it would work and then stop in the beginning. I did look for a faded red strip on the white wires and didn't find any, there is another wire with a faded red strip but that doesn't connect to the ignition coil and goes entirely else where.
 
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Old 09-18-2014, 10:19 PM
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the blue wire to the coil is ignition switched power. the white-red wire is the timing pulses from the ICU, and this s what the tach watches (although the actual wire to the ach might come from closer to the ICU).

afaik, white-with-red-stripe is ONLY used on ignition timing, its otherwise very uncommon-to-non-existant.

so.... figure out where that white wire thats plugged into the blue side of the coil is going.... there shouldn't be anything there, but maybe some hack before you put a accessory on there as a easy-to-find source of ignition power? to which I'd say, ugh, but whatever.
 
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  #18  
Old 01-29-2015, 06:40 PM
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Default Re: Tachometer

So after some investigation and a little research I figured out that the hall sensor in the Distributor was broken. So I purchased a new cap, rotor, distributor and seals and put it in. Even though the installation was successful the RPM gauge did NOT start working. I guess maybe it is the gauge itself. Special thanks to Pierce who helped me narrow things down. In the end the parts needed replacing, for example a cap and rotor are replaced as maintenance every 50,000 miles.

Here is the video on youtube in-case someone has to do something similar.

 
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Old 01-29-2015, 07:36 PM
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if you can find the wire you think goes to the tach, switch ignition on, and repeatedly tap it as fast as you can on a 'hot' signal, the tach needle should jump. that wire should be connected to the coil pin 1
 
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