Tach wire?

C

Chad

Registered
Installing a remote start unit in my 1993 Mark VIII and I am having a heck of a time finding the tach level wire to tap into for the remote start module? Can anyone tell me what colors it is and where it's hiding?!
I'm also hunting for the orange w/ green trace and orange with red trace wires for the door locking. Know where those live?



Chad
Owner of a 1993 Deep Jewel Green with Mocha interior Mark VIII
IA Parrot, one of the most popular avian resources on the internet
http://aviary.info
 
RE: Tach wire?

Ok, found this on another website.. should be helpful for myself and anyone else with a similar question:
(It's not the brand I have but it tells me what wires in my Mark I need to use.. )


DesignTech International, Inc. - Web Support


--------------------------------------------------------------------------------

Lincoln

MARK VIII

1993-1995

Remote Starter Wiring Colors and Notes

Function DTI Color Vehicle Color Location

Start: Yellow RED/LIGHT BLUE (MAY BE 2) - IGNITION SWITCH HARNESS

Ignition #1: Blue RED/LIGHT GREEN IGNITION SWITCH HARNESS

Ignition #2: Green GRAY/YELLOW IGNITION SWITCH HARNESS

Ignition #3: Wht/Blk BROWN IGNITION SWITCH HARNESS

Accessory: White BLACK/LIGHT GREEN IGNITION SWITCH HARNESS

Brake Light: Orange LIGHT GREEN (+) SWITCH ON BRACKET ABOVE BRAKE PEDAL

Tach Signal: Green TAN/YELLOW PIN 2 AT IGNITION CONTROL MODULE *

parking lights: Yellow BROWN (+) @ headlight switch OR DRV KICK PANEL

Headlights: Yellow RED/YELLOW (+) HEADLIGHT SWITCH OR BEAM SELECT SW.

OEM Alarm Disarm: Brn/Wht DARK GREEN/PURPLE (-) IN EITHER KICK PANEL

OEM Alarm Arm: n/a N/A

Diesel Glow Plug: Red/Black

Clutch Bypass Wire: n/a


Notes:
* Ignition Control Module Located On Rear Of Driver Fenderwell (93) Or Driver Front Of Engine Compartment (94) Or Left Hand Side Of Engine Compartment To Right Of Master Cylinder (95).

--------------------------------------------------------------------------------

Lincoln

MARK VIII

1993-1995

Alarm and Keyless Entry Wiring Colors and Notes

Function DTI Color Vehicle Color Location

Constant +12 Volts: Red 2 YELLOW AND 3 BLACK/ORANGE - IGN. SWITCH HARNESS

Starter Kill: Vlt or Wht RED/LIGHT BLUE (MAY BE 2) - IGNITION SWITCH HARNESS

Ignition +12 Volts: Orange RED/LIGHT GREEN IGNITION SWITCH HARNESS

Dome Lights/Superv: Brown BLACK/LIGHT BLUE (+) COURTESY LT OR GRAY (-) AT PIN SW.

OEM Horn: Blue YELLOW/LIGHT GREEN (-) STEERING COLUMN HARNESS OR AT RELAY

Power Lock: Wht/Red PINK/YELLOW DRIVER'S KICK PANEL **

Power Unlock: Yel/Red PINK/LIGHT GREEN DRIVER'S KICK PANEL **

Trunk Release: Grn/Wht PURPLE/YELLOW (+) RELEASE SW. OR DRIVER KICK PANEL

Alarm Input Wire: R/W or Gy/Bk BLACK/LIGHT BLUE (+) COURTESY LT OR GRAY (-) AT PIN SW.




Chad
Owner of a 1993 Deep Jewel Green with Mocha interior Mark VIII
IA Parrot, one of the most popular avian resources on the internet
http://aviary.info
 
RE: Tach wire?

Ok gang..
Tach Signal: TAN/YELLOW PIN 2 AT IGNITION CONTROL MODULE

I found a tan with yellow trace under the dash going into the big silver computer module. I put a voltage meter on it and started up the engine and it began reading about 120mv I believe. Then I rev'ed the engine a bit and it seemed to follow the engine RPM with voltage increase. So I rev the engine, the reading increases to 130, 140 etc then let the engine idle back down and it goes down to 115-120 or so... problem is, the Audiovox Prestige remote starter I am installing doesn't seem to be able to read it?

According to the manual I am supposed to program the tach rate:
Turn the ignition to ON
Press and release the program button on the remote start module 3 times.
Turn the ignition key OFF.
The car horn chirps twice then lets loose a .5 second blast at this point.
Press and hold the program button.
Start the car with the key.
While holding the button, the parking lights are supposed to flash, indicating that it's registering the tach rate properly.
Then I am supposed to release the program button and shut the car off.

Problem is, the lights never flash. And when I try to start the car with the remote starter, the unit flashes the parking lights 7 times, indicating that it has not had the tach rate programmed.

Any ideas? Everything else seems to be hooked up correctly. It's locking and unlocking the doors and such. I didn't have an extra relay for the interior lights or the trunk so those aren't hooked up yet.


Chad
Owner of a 1993 Deep Jewel Green with Mocha interior Mark VIII
IA Parrot, one of the most popular avian resources on the internet
http://aviary.info
 
RE: Tach wire?

I don't believe you've found the tach signal.

Circuit #11 is the tach signal according to the EVTM. Tan/Yellow is the wire code alright. The circuit originates at pin 2 of the ICM(Ignition Control Module), branches to pin 4 of the PCM(Powertrain Control Module), pin 34 of the Message Center and pin 1 of the Instrument Cluster(Tachometer input).

The message center uses the tach input and lists the normal voltage(with engine running) at 0.5 volts at idle and 1.6 volts at 3000 rpm. Based on that, I don't believe you are reading the proper circuit or voltage.

You can check if the tach signal is valid at the Message Center.

Message Center On-Board Diagnostic Mode

The message center contains an on-board diagnostic mode of operation. To enter on-board diagnostic mode, press the RANGE and COMPASS switches simultaneously while turning the ignition to RUN. The following chart describes each test. A press of the RANGE switch will advance the message center to the next test. A press of the RESET switch will abort the on-board diagnostic mode and return the message center to normal operation.

Test Name / Description

ROM Level / Displays the Read Only Memory (ROM) level of the message center. This is usedwhen requesting assistance from the HOTLINE.

NVM Level / Displays the Non-Volatile Memory (NVM) level of the message center. This is used when requesting assistance from the HOTLINE.

NVM Check / Checks the Non-Volatile Memory (NVM) for accuracy. If the message is NVM OK,proceed to the next step. If the message is REPLACE M/C, remove the message center and install a new message center.

Display Check / Displays the same character in all 24 character positions. The initial characteris all dots on. Presses of the ENGLISH/METRIC switch sequence the displayed character through the entire character set.

Tach Check / Determines if a tach signal is being received by the message center. If the message is TACH SIGNAL OK, the tach signal is being received. If the message isTACH SIGNAL ERROR, no tach signal is being received. The engine must be running to receive a tach signal.

If it helps, pin 28 at the Message Center is the signal ground.
 
RE: Tach wire?

Thanks! I'll head back out into the cold today and see if I can locate the proper wire!


Chad
Owner of a 1993 Deep Jewel Green with Mocha interior Mark VIII
IA Parrot, one of the most popular avian resources on the internet
http://aviary.info
 
RE: Tach wire?

The wire you are looking for is at the coil pack.Thats where mine was hooked up and worled flawlessly for years.
 
RE: Tach wire?

I don't believe you've found the tach signal.

Circuit #11 is the tach signal according to the EVTM. Tan/Yellow is the wire code alright. The circuit originates at pin 2 of the ICM(Ignition Control Module), branches to pin 4 of the PCM(Powertrain Control Module), pin 34 of the Message Center and pin 1 of the Instrument Cluster(Tachometer input).
Click to expand...


Yep, it was right where you say it was.. Pin 2 at ICM. I was trying to avoid going into the engine compartment for this but I just couldn't locate the tach signal anywhere under the dash. I don't know where the message center module is and I didn't feel like wrestling with the spedo cluster. ;) Thanks for the assist! The Mark VIII starts like a charm ... from 1000+ feet!

I broke down and popped a relay on the start module for the trunk and plan on doing one for the entry illumination feature as well. Currently it's locking/unlocking doors, flashing parking lights, chirping the horn and popping the trunk. - I wonder though, if I couldn't just tie into the existing keyless entry module for the trunk and internal lights?


Chad
Owner of a 1993 Deep Jewel Green with Mocha interior Mark VIII
IA Parrot, one of the most popular avian resources on the internet
http://aviary.info
 
RE: Tach wire?

I didn't go tachless because I found a good price on this one. The tach wasn't that hard to do once I knew where to look. It was pin 2 at the ICM which is located under the hood on the driver's fender. It's under the plastic strut cover between the engine and the fender. Take off two plastic screws and unplug the ICM from the harness, solder into the second wire (2nd from right if you're looking at the back of the harness where the wires enter the plug) which is Tan with a yellow trace.

It really was a lot easier than I made it out to be. I was just trying to go the lazy route by not entering the engine compartment for the tach sensor when I should have just done that in the first place. Turns out by trying to make it easier, I made it a lot more difficult. ;) Story of my life really.

Chad
Owner of a 1993 Deep Jewel Green with Mocha interior Mark VIII
IA Parrot, one of the most popular avian resources on the internet
http://aviary.info
 
RE: Tach wire?

- I wonder though, if I couldn't just tie into the existing keyless entry module for the trunk and internal lights?
Click to expand...

The trunk is easy. Either a relay in the keyless entry or the manual trunk release button in the driver's door momentarily supplies 12V power to the trunk release solenoid via the 84 (P/Y) circuit(RKE pin 22 - Release Trunk Lid Output).

The internal lights... you mean the illuminated entry feature? From the EVTM:

Illuminated Entry Feature

The illuminated entry feature may be activated by lifting a door handle or by pressing any transmitter key. When either of these is performed, the RKE module applies battery voltage to the interior lamps and keyhole illumination lamps via the 53 (BK/LB) circuit for 25 seconds, provided the ignition switch is off. Turning the ignition switch on will turn the interior lamps immediately off.

Here using the 53 (BK/LB) output circuit would do no good since it is a timed relay output. However you could use a relay and trick the RKE into thinking the door handle was lifted, hence initiating the 25 second illumination entry timer. You could do this via a relay momentarily supply a ground signal to circuit 465 (W/LB)-(RKE pin 7 - Door Latch Switch Input).
 
RE: Tach wire?

The remote starter has an output for a 30 second illumination circuit... It says it requires a relay but that's because they don't anticipate the Mark VIII which already has this feature. I wonder if I can tap into the circuit at the door handle and send it a short signal instead of a relay to control the lights myself... - regardless I have a new issue:

It doesn't seem that when I start my car remotely that it enables the heater to function. The heating remains powered down until I turn the key to ON. Odd.. ? :)



Chad
Owner of a 1993 Deep Jewel Green with Mocha interior Mark VIII
IA Parrot, one of the most popular avian resources on the internet
http://aviary.info
 
RE: Tach wire?

Well if your remote starter has a 30 second illumination circuit, tap 12VDC out from the remote starter 30 second illumination circuit into circuit 706 (GY)-(RKE pin 17 - Door Jamb Switch Input). That circuit feeds power from the door jamb switches or the dome switch in the autolamp/dimming module to the RKE to illuminate the courtesy lamps. I would guess the easiest physical access to this circuit would be at the autolamp/dimming module.

It doesn't seem that when I start my car remotely that it enables the heater to function. The heating remains powered down until I turn the key to ON. Odd.. ?
Click to expand...

Define "powered down". Both the EATC and blower motor speed controller have separate IGNITION inputs(that is to say they are supplied power when the key is in the RUN position). If "powered down" means no power to the EATC then obviously you would have no heater. If "powered down" means no power to the blower but the EATC is functioning, you would have no heat being blown about in the car. Of course this presumes the car runs long enough to close the CELO(Cold Engine Lockout) Switch with a warm engine.

Sounds to me like one of those two circuits is not receiving power through the remote starter circuitry.
 
RE: Tach wire?

The EATC is dark, no power until I put the key in, turn it ON and hit the brake (which shuts off the remote start's control of the ignition circuit). I might have my ignition wires mixed a bit. The Ignition 2 and such I'll have to review those I think.


Chad
Owner of a 1993 Deep Jewel Green with Mocha interior Mark VIII
IA Parrot, one of the most popular avian resources on the internet
http://aviary.info
 
RE: Tach wire?

Check that fuses 1(30A) & 5(10A) of the Instrument Panel fuse panel are hot with the ignition on via remote; also check fuse 16(10A) for power on at all times.
 
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