alarm, tach, 2006 qx56

Okay guy's I need your help with finding the tach for a 2006 QX56, everything I've found so far tells me it's any wire at any of the ignition coils that isn't black or wht/blue. I tested multiple wires still no luck with the alarms successfully learning it. any help would gladly be appreciated, oh yeah I'm installing a viper 5901 alarms system.
Thx

Whar are your other wire color choices?

What is the manner in which you are tapping in to one of these wires to get a pulse? What parts are used?

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I know just enough to be dangerous. VERY dangerous.

The other colors I see are yellow/red or blue/red, which are the ones that I could easily reach. I found the blk/wht & blu wires at the different ignition coils, or at least what I think is the coils. Which there appears to be 4 on each side of the engine. Unless I'm looking at the wrong thing, which is about the same area I've used in other alarm installs with no problems.

The way I'm tapping them at the moment is by skinning the wire so I could see the copper and then i wrap the violet/wht wire from the alarm around one of those wires.

Just to make sure I didn't have a bad alarm system, I tried using the alarm that I removed from my previous vehicle before I traded it and it doesn't read the tach either. The bad part is this alarm was on a Nissan and now I trying it on an Infiniti which is made by Nissan...very strange.....

Thx

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smallbody

I doubt you are mistaking the coil wires, they do after all have an output that goes directly to the spark plugs.

A t i n y little pulse is sent to them and the coil packs amplify that signal to generate the spark.

The wires you want to tap are the ones that carry the tiny pre amp'd signal. This can't be vague, it needs to be a good solid connection.

Since some of the wires will be ground, and one of the wires will be 12v steady the process of elimination may help you.

The pulsed signal wire will not read 12v and if you have a VM that can read the RMS you would see the value changing as the RPM increases.

Or you could just set the VM to AC and a really low voltage setting and see if you can see flutuating readings.

Check the Infinity forums and see if anyone has the FSM for your car with the actual schematic. (edit - you've already done that)

https://www.nicoclub.com/FSM/QX56/  look at the idx and ec PDFs.

Or find a mechanic and buy him a beer for actual wire info.

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I know just enough to be dangerous. VERY dangerous.

fortin says

TACH - ORANGE / White @ Coil or ECM Module (right side of engine compartment)

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Ted
2nd Year Tier 1 Medical School
Still installing as a hobby...pays for groceries
Compustar Expert

question for you Anonymous1 this is first that I can remember with a negative tach wire. Does that matter for a RS to learn it?

tedmond wrote:

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fortin says

TACH - ORANGE / White @ Coil or ECM Module (right side of engine compartment)

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Ok, cool I will try to find this wire tomorrow after work.Thx

Thx Tedmond, just to be clear - the ORANGE / White  wire will be found both at the Coil AND the ECM Module? Same wire two ends?

The reason I ask this, is that it might be prudent to take the shortest path back through the firewall and avoid the main engine components and heat if possible.

@ OP, I wasnt aware that it was a negative tach wire as I didnt download and read the PDFs, I just knew they existed, where they were and which ones you needed based on my own experiences.

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I know just enough to be dangerous. VERY dangerous.

same wire colour at both locations. i would go to the ECM so it sits towards the right side and out of the way.

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Ted
2nd Year Tier 1 Medical School
Still installing as a hobby...pays for groceries
Compustar Expert

with thta being said, the wire is located at both locations for misfire detection. The ecm monitors the injectors and coil to see if its working in order and if the timing is right.

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Ted
2nd Year Tier 1 Medical School
Still installing as a hobby...pays for groceries
Compustar Expert

Here are the schematics I used for reference and I checked the ORANGE / wht wire,which was loacted at the second coil on the right side of the engine. Still no luck with alarm learning. PART	COLOR	LOCATION
12 VOLT CONSTANT	GREEN (+)	IGNITION SWITCH HARNESS
STARTER	BROWN (+) See NOTE *1	IGNITION SWITCH HARNESS
STARTER 2	LIGHT GREEN (+) or BLUE/GREEN (+) See NOTE *1	IGNITION SWITCH HARNESS
IGNITION 1	BLACK/ RED (+)	IGNITION SWITCH HARNESS
IGNITION 2	N/A
IGNITION 3	N/A
ACCESSORY /HEATER BLOWER 1	RED (+)	IGNITION SWITCH HARNESS
ACCESSORY /HEATER BLOWER 2	PURPLE (+)	IGNITION SWITCH HARNESS
KEYSENSE	N/A
PARKING LIGHTS ( - )	N/A
PARKING LIGHTS ( + )	RED / BLUE (+)	IN DRIVERS KICK PANEL, HARNESS heading to REAR of Vehicle
POWER LOCK	BLUE (Negative (-))	@ DRIVER DOOR MODULE IN DOOR, Pin 4
POWER UNLOCK	RED (Negative (-)) Requires Double Pulse	@ DRIVER DOOR MODULE IN DOOR, Pin 6
DOOR TRIGGER	See NOTE *2	@ BCM, See NOTE *3
DOMELIGHT SUPERVISION	BLUE (-)	@ BCM PIN 63, See NOTE *3
TRUNK RELEASE	YELLOW/BROWN (-)	@ BCM, Pin 30, See NOTE *3
SLIDING POWER DOOR	N/A
HORN	RED / WHITE (-)	@ STEERING COLUMN HARNESS
TACH	Any wire NOT BLACK or WHITE/ BLUE (-)	@ ANY IGNITION COIL
WAIT TO START LIGHT	N/A
BRAKE	RED / GREEN (+)	@ SWITCH ABOVE BRAKE PEDAL
FACTORY ALARM DISARM	DISARMS WITH UNLOCK, Single Pulse Disarms
ANTI-THEFT	TRANSPONDER ANTI-THEFT SYSTEM, REQUIRES 791 BYPASS MODULE AND EXTRA IGNITION KEY	TRANSPONDER @ IGNITION SWITCH TUMBLER

EXTRA INFORMATION

NOTE *1 When Installing a REMOTE STARTER, you MUST use BOTH Starter #1 and Starter #2 wires. Both wires must be connected to the STARTER/CRANKING Output wire from the Remote Starter or the vehcile will NOT Remote Start when the Engine is cold. NOTE *2 LEFT FRONT DOOR TRIGGER IS LIGHT BLUE(-) IN PIN47 .THE RIGHT FRONT DOOR TRIGGER IS RED / BLUE(-) IN PIN 12 . THE LEFT REAR DOOR TRIGGER IS RED / YELLOW(-) IN PIN 48 THE RIGHT REAR DOOR TRIGGER IS RED / WHITE OR GRAY(-) IN PIN 13 .WHEN CONNECTING TO AN ALARM SYSTEM, USE ALL 4 DOOR TRIGGER WIRES AND DIODE ISOLATE. TO CONNECT, SEE DIAGRAM NOTE *3 BCM (BODY CONTROL MODULE ) RIGHT OF STEERING COLUMN.

alarm learning?

you mean tach learning?

make sure the unit is in tach mode and not voltage or alternator sense.

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Ted
2nd Year Tier 1 Medical School
Still installing as a hobby...pays for groceries
Compustar Expert

I went through those steps with a bitwriter, I hooked it up and went through all the steps to verify it was in tach mode. According to the programming it should be in tach mode, but it still will not learn the tach of this vehicle. But no matter what I will not give up until it's found.

I feel with all the help and info being provided I'm bound to come across the correct wire, hopefully sooner than later.

Thx

try the odd colored fuel injector wire

I would like to say thx to all that give me some help with trying to find the tach for my truck, I finally got it to accept with one of the wires coming from one of the fuel injectors, it was a gray/wht wire. Finished the install and now I can move on to the next project. Thx Guys.

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smallbody