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Old 06-05-2008, 05:31 PM   #1
boostdemon
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Default 740 - gauge cluster swap / sensor differences (VDO/Yakazi)

Ok, so in the '86 745 GLE, the odo is dead... i have a whole cluster from an '87 740 (i think) from the junk yard... plug it in, everything works except the coolant gauge spikes to the right.
//update:
coolant and gas gauges are off significantly - see below

I'm guessing voltage differences between the two circuits? = whats the difference, add a resistor?

coolant temp sensors different? swap in a later style sensor?



thoughts?
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Old 06-05-2008, 05:32 PM   #2
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Quote:
Originally Posted by boostdemon View Post
Ok, so in the '86 745 GLE, the odo is dead... i have a whole cluster from an '87 740 (i think) from the junk yard... plug it in, everything works except the coolant gauge spikes to the right.

I'm guessing voltage differences between the two circuits? = whats the difference, add a resistor?

coolant temp sensors different? swap in a later style sensor?



thoughts?
No difference in sensors.
Check the wiring.
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Old 06-05-2008, 05:35 PM   #3
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the clusters are physically different is why it cropped up as an option that they used different voltages. I will check and see if maybe a wire is different on the plug to the back
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Old 06-05-2008, 06:39 PM   #4
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are they both made by the same company? i mean is one a Yazaki and one VDO? or vice-versa?
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Old 06-07-2008, 06:02 PM   #5
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ok, heres the new one with the spiking coolant sensor... and yes matt i think its a Yazaki (cant read japanese but i'm guessing thats what it says lol)



And heres the one in the car with the odo that doesnt work.

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Old 06-08-2008, 03:29 AM   #6
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the old one says "made in germany" on it... VDO?
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Old 06-08-2008, 04:18 AM   #7
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Yup, I see the new one is a Yazaki, made in Japan. Look at the toward the right side of the speedo 'box' in the picture...you can kind of see the Yazaki and Made In Japan under the VOLVO logo.
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Old 06-08-2008, 01:00 PM   #8
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so whats the difference between the two? i pretty much swapped them out wire for wire
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Old 06-09-2008, 01:14 AM   #9
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When the car starts warming up, does the temp needle start dropping, or does it stay solid right?
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Old 06-09-2008, 02:12 AM   #10
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um... i'm not entirely sure, but it stayed pegged right from the moment i clicked the key on... for a drive around the block and then back. if you're on to something i can always try again to see if it moves
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Old 06-09-2008, 10:31 PM   #11
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checked the wiring manual... plug for plug (even if they're in slightly different spots) they are exactly the same.
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Old 06-13-2008, 09:06 PM   #12
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ok, so i sat there with both clusters...

gas gauge and coolant readings are different:

VDO original:
gas 4/5 full
coolant full cold (left sitting on line)

Yazaki new:
gas 1/5 (just above the red line)
coolant 1/4 up the bar.
...the coolant earlier this week was reading 1/2 when it was 105º outside, tonight its 85º both times cars sitting there.
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Old 06-14-2008, 12:04 AM   #13
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Hmm...I thought I read somewhere that the coolant temp gauges on the VDO and Yazaki had opposite resistance measures (?...cant think...Friday!) But then again, Im at a loss...anyone else chime in?
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Old 01-02-2009, 04:54 AM   #14
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ok i'm still with out a working odometer... anyone want to help narrow this down? It would be easiest to just swap the clusters if i can figure out what to do to correct the gauges input signals
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Old 01-02-2009, 09:06 AM   #15
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the boards are different when looking at the back of them there are many plugs on the one you got from the junkyard versus your old board its totally diffrent i would look for another cluster
something the is closer to what you have. you need one that has the same amount of plugs on it and not a bunch of different ones.
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Old 01-02-2009, 09:58 AM   #16
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oh trust me, i've been looking for the better part of 6 months.

they both have exactly the same plugs, and acording to the wiring green book (reminds me i need to return it to Dan) they are for the same connections. they are just in different locations.



1. tach
4. 15+ power
5. digital output for cruise control

2,3,and 6 are all the goodies/signals and are pin for pin exact

Last edited by boostdemon; 01-02-2009 at 10:13 AM..
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Old 01-02-2009, 10:18 AM   #17
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looking at description... connection #2 above...

pins from left to right...
1 - fuel level sensor (w-gr)
2 - right turn signal
3 - left turn signal
4 - temperature sensor (-) (Y-SB)
5 - 30+ supplyu (GN-R)
6 - to oil pressure sensor (-) (SB)
7 - to temperature sensor (Y-W)
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Old 01-02-2009, 11:24 PM   #18
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help me $500matt-ken-obi, you're my only hope
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Old 01-03-2009, 03:22 AM   #19
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from the volvoclub uk site; looks like the water temp sensor is different for 1987-1995

Quote:
Coolant temperature gauge sensor resistor ratings for 7XX/94X cars are:

Cars from 82-86: 87 ohms to get a 90C reading at the gauge (range: 217 ohms +/- 35 ohms at 60C/140F to 67 ohms +/- 15 ohms at 100C/212F)

Cars from 87-93: 206 ohms to get a 90C reading at the gauge (range: 560 ohms at 60C/140F to 153 ohms at 100C/212F)

Cars from 94 on: 75 ohms to get a 90C reading at the gauge (range: 780 ohms at 20C/68F to 75 ohms at 90C/194F)
... so simple enough, just need to grab a sensor for an '87+ right?

however the gas sender seems to be the same? i dunno..

Quote:
1984-1992 Tubular-type fuel gauge with:

60-litre tank: left side of pointer should touch red part of gauge

80-litre tank: right side of pointer should touch red part of gauge Empty tank: 0- ohms

LED "low gas" lit: 10-18 ohms

Full tank: 280 ohms Supply voltage comes from temp gauge.
Insert test resistor between gray-white lead at gauge side and ground.

Measure sensor resistance between ground and gray-white lead at sensor side.
so the part i bolded... should changing the temp sensor to the later model magically correct the fuel gauge issue? that seems really odd

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Old 01-03-2009, 10:38 PM   #20
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!!!!

I was planning on starting a thread very similar to this in month or so.

I'm putting the cluster from an '84 760 into my '87 745 so long as I can get everything to work.

I knew the coolant sensor, just pulled one from an older block to swap in.

The research I've done says everything else is the same?
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Old 01-03-2009, 11:14 PM   #21
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Just looking at the pic, not knowing much about it, I see very little or no real electronics anywhere. There are a few diodes, the black components with a lead coming out of each end but they rarely fail.

Is there a voltage regulator somewhere I cannot see, typically a flat package with three leads, those fail and cause the gauges problems.
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Old 01-03-2009, 11:45 PM   #22
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Maybe something HERE will help
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Old 01-04-2009, 01:43 AM   #23
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Quote:
Originally Posted by Tamnakz View Post
!!!!

I was planning on starting a thread very similar to this in month or so.

I'm putting the cluster from an '84 760 into my '87 745 so long as I can get everything to work.

I knew the coolant sensor, just pulled one from an older block to swap in.

The research I've done says everything else is the same?
is the cluster from the '84 a VDO like above? maybe we can just trade... i'll give you a working '87 cluster and i'll swap in that '84 you have


Quote:
Originally Posted by moxy123 View Post
Just looking at the pic, not knowing much about it, I see very little or no real electronics anywhere. There are a few diodes, the black components with a lead coming out of each end but they rarely fail.

Is there a voltage regulator somewhere I cannot see, typically a flat package with three leads, those fail and cause the gauges problems.
all the real electric guts are on the gauges behind the white plastic pieces. What indications are there on a voltage regulator?
The speedo works, (occasionally bounces around the actual speed) just the odo and trip dont.
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Old 01-04-2009, 01:49 AM   #24
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Yes, it's VDO. NO I won't trade. . .

I May have anoter though. . .

I want the '84 because it has unique gauge faces. I've also added stock oil pressure and temp to the upper right and left corners.
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Old 01-04-2009, 01:49 AM   #25
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Quote:
all the real electric guts are on the gauges behind the white plastic pieces. What indications are there on a voltage regulator?
The speedo works, (occasionally bounces around the actual speed) just the odo and trip dont.
There could be many numbers, it usually is a flat pack and three leads on one side. About 3/8" x 3/8" x 1/4" typical. I do not know if it has one but it could be an easy fix.
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