Problem with Lanos SX instrument cluster

Hassan · Post by **Hassan** » Wed Jun 30, 2004 11:56 pm

Hello,

I recently got an instrument cluster from a Lanos SX, and installed it in my Lanos 1.5 SOHC. Everything works without rewiring except the tach signal.

I ran a wire into the engine bay and found two wires (green with black stripe) which produce a signal. Problem is, one of them makes the tach only show half the actual output, and the other wire produces an erratic output (tach needle moves jerkily, sometimes falls to zero).

I am wondering: is one of these two wires the same as the tach signalwire I have read about, or should I be looking for a wire coming out of the ECU? I don't want to have to remove the passenger seat for nothing.

By the way, there is a green wire with black stripe in the connector that fits into the tachometer, however it doesn't produce any signal at all. As if it has been deliberately disabled.

So, am I simply connecting to the wrong wire, or is my tach out of order? input appreciated.

Regards,

AcingTeam · Post by **AcingTeam** » Thu Jul 01, 2004 2:54 am

I would say you are connecting to the wrong wire. On my Lanos 1.6 Dohc, the car had no tach... so I installed an aftermarket one. I wired it to the green wire with a black stripe that is coming out of the ECU box under the seat. And it works perfect.... so I would try doing that. (It is the middle wire branch and the wire approximately is 6th from the right on the bottom row of the branch).

daewooluvr · Post by **daewooluvr** » Thu Jul 01, 2004 2:03 pm

the 1.5L ECU is different than the 1.6L ECU.

I'm not sure if anyone has found the tach wire in the 1.5L ECU yet...

Wolf-Spirit · Post by **Wolf-Spirit** » Thu Jul 01, 2004 3:53 pm

signal from the coils is indeed 1/2 from actual measurement.
But there should be a wire from ECU that gives the signal like in the 1.6 (must be considering in belguim we install lots off LPG systems who need that signal)

i would sugest looking on the wiring diagrams

Markthomasz · Post by **Markthomasz** » Sat Feb 12, 2005 9:00 am

If anyone DOES find that wire for the 1.5, I would be most interested. I've looked at the schematics I could find, and it *seems* to be the same green-black wire, but when connected to my el-cheapo tachometer, nada.

The ECU on my Lanos is clearly different to that on 1.6L models, as it does not have the same wire bunches as described on the Daewootech site.. I even had a hard time finding the dam thing - it is hidden behind the drivers kick panel, near the accelerator, on RH drive models.

Is it not possible to go back to the `source`, in the engine compartment somewhere? Forgive my naivety, as an oldtimer who remembers tachometers being connected to the coil - on these new-fangled machines there doesn't appear to *be* a coil... But is there somewhere else I can trace it back to, or is the ECU `it`?

And why are auto electricians so afraid to help? Surely with a bit of knowledge and maybe a half hour hunting around with a CRO... I *wish* I didn't live in a small regional town far from the big cities!

MMamdouh · Post by **MMamdouh** » Sat Feb 12, 2005 12:52 pm

installing a tach on a 1.5 SOHC is the most bit*h task to do

first of all... many people got to the point where the tach reads half the actual revs, you found the wire in the engine compartment... the one at the ECU will give you the same results so this is not the solution you are looking for.

a friend of mine did the same swap you did and had the same problem... he came up with some "additional electrical circuit" to adjust the signial going to the tach to read correctly

... i am not sure of what he did exactly but he sent me the diagram as i am planning to do the very same swap in the future.

for him it was working ok but other people still have problems with itso if you can replicate that wiring circuit...be my guest.

this is the modification circuit for adjusting the signal.

and this is a circuit with a protection... no idea what it will contribute really

try them and give us your feedback, also any comments from the people with electrical circuit knowledge will be appreciated.

MMamdouh

MMamdouh · Post by **MMamdouh** » Sat Feb 19, 2005 11:26 pm

Maybe that can help a bit.

Do any cars require special tach calibration?

In some cases with newer vehicles, such as Chevy Cavalier, Mitsubishi Eclipse, Dodge and Ford V-10's, tachometers will have to be specially calibrated at an additional charge. Contact Auto Meter customer service for more details. -------------------------------------------------------------------------------- '94 - present Chevy Cavaliers, S-10 pickups or anything else that has the GM 2.2L FOUR cylinder motor (Need to be set for 1 and 2 pulse) ALL Dodge V-10 motors and Vipers (Need to be set for 2.5 and 5 pulse per rev, and also 5-volt square wave) ALL Ford V-10 motors in either the trucks or vans up to '98 (Need to be set for 2.5 and 5 pulse per rev) FOR '99+ - before purchase is made, customer MUST check to see that the tach signal wire is present, to ensure the tach's operation. To do this, look for white wire with pink or red stripe, coming off the computer (PCM), which sometimes is labeled CTO (clean tach output) - if present, the tach will need to have the same calibration as the earlier years (2.5 and 5 ppr). Late '97 - present LS1 motors, which include the Camaro, Firebird, Corvette (Need to be set for a 5-volt square wave) Most '93 - present Eagle Talons, Mitsubishi Eclipse, Plymouth Laser (Need to be set for 1 and 2 pulse per rev) ? - present Dodge/Plymouth Neons (Need to be set for 1and 2 pulse per rev, and also 5 volt square wave) ALL '93+ Volkswagon models with the VR-6 motor (Need to be set for 1 and 2 pulse per rev) Any odd number cylinder motor - Audi 5 cylinder, Chevy/Geo Metro, Sprint, or Suzuki Swift. (Call for specific details (330)630-0240)

http://www.streetandstripmotorsports.co ... earchText=

MMamdouh

Markthomasz · Post by **Markthomasz** » Mon Feb 21, 2005 5:35 am

Thanks, mmamdouh. I reckon that number-of-pulses-per-rev is the key to this. As I said, I'm a little surprised that my local auto-electronics 'technicians' (for want of a better title!) won't help. It seems to me that they could easily use an oscilloscope to see what signal is actually coming out of that green-black wire, and then work up a circuit to put it into the form expected by a standard third party tachometer. Which is probably what your diagrams above are all about, I'm guessing.

Next time I'm in the 'big city', I might show all this to an upmarket performance electronics specialist, and see if they would be willing to help, providing Daewoos aren't too down-market for them.. (O;

Having just started the performance mods on my little Lanos, I'm starting to get enthused, and that little needle sitting on zero constantly is annoying me...

MMamdouh · Post by **MMamdouh** » Mon Feb 21, 2005 10:10 am

you got that right... those circuits are supposed to adjust the current from the ECU so that the tach can read correctly.

unfortunatly i don't know much about them electrical circuits so i just copied one of my friend's work and posted it here... so far it was working great for him but i prefer to find a correct signal wire on the ECU rather than using a modification circuit.

MMamdouh