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2000 Lancer CE Negative Tach Signal


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ice32 
Copper - Posts: 116
Copper spacespace
Joined: June 12, 2007
Location: Australia
Posted: August 06, 2007 at 2:27 AM / IP Logged  
Hey,
I'm trying to locate the tachometer signal wire in my lancer 2000 ce to install a RPM tacho i know its a white wire as i have a wiring manual for the car, I'm just unaware of its location in the car and how to identify it.
Any help would be great.
Thanks in advance
eurobink 
Copper - Posts: 55
Copper spacespace
Joined: September 06, 2007
Location: Florida, United States
Posted: September 07, 2007 at 1:15 AM / IP Logged  

try BLACK / YELLOW or BLACK/ green at ignition coil

if that fails, find the connector on top of trans.. typically less than four wires and have at it

ice32 
Copper - Posts: 116
Copper spacespace
Joined: June 12, 2007
Location: Australia
Posted: September 14, 2007 at 3:48 AM / IP Logged  
Hey,
I have a tachometer that required positive pulses to calculate the RPM but my cars ECU outputs negative pulses.
Is there anyway i can convert the signal to positive?
Thanks in advance for any info.
KPierson 
Platinum - Posts: 3,526
Platinum spaceThis member consistently provides reliable informationspace
Joined: April 14, 2005
Location: Ohio, United States
Posted: September 14, 2007 at 7:18 AM / IP Logged  

You could use a PNP transistor.  Wire the base through a 33K ohm resistor, the emitter to 12vdc, and the collector will be your + output through a 100 ohm resistor.

You could also get fancy and optoisolate it.  On the output of the optoisolator you could pull off a + signal.

Kevin Pierson
ice32 
Copper - Posts: 116
Copper spacespace
Joined: June 12, 2007
Location: Australia
Posted: September 14, 2007 at 8:20 AM / IP Logged  
hmm, that went over my head, would you be able to simplify it a little please?
KPierson 
Platinum - Posts: 3,526
Platinum spaceThis member consistently provides reliable informationspace
Joined: April 14, 2005
Location: Ohio, United States
Posted: September 14, 2007 at 2:45 PM / IP Logged  
Look for a transistor - like a 2n3906 and follow the pinout on the back - it is a three pin device.
Kevin Pierson
ice32 
Copper - Posts: 116
Copper spacespace
Joined: June 12, 2007
Location: Australia
Posted: September 19, 2007 at 4:53 AM / IP Logged  
So i've wired it up like so
2000 Lancer CE Negative Tach Signal -- posted image.
Is there anyway i can test its gonna work before plugging it into my car and risking the chance it will fry my ECU?
KPierson 
Platinum - Posts: 3,526
Platinum spaceThis member consistently provides reliable informationspace
Joined: April 14, 2005
Location: Ohio, United States
Posted: September 19, 2007 at 5:40 AM / IP Logged  

You may want to check your wiring - the base should have the (-) signal and the emitter should have the 12vdc feed.  You may have it right, but on the 2n3906s I have the base is the middle pin.

You can test it out by metering the collector, after the resistor.  It should read 'OL' (open leg) when the base is NOT held to ground.  When the base is held to ground the collector should read 12vdc.

Kevin Pierson
ice32 
Copper - Posts: 116
Copper spacespace
Joined: June 12, 2007
Location: Australia
Posted: September 19, 2007 at 5:49 AM / IP Logged  
yep, checked the wiring the base is the middle pin, i'll test that out soon,
thanks
ice32 
Copper - Posts: 116
Copper spacespace
Joined: June 12, 2007
Location: Australia
Posted: September 19, 2007 at 8:24 AM / IP Logged  
Thanks heaps, it worked like a charm!

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