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

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)

http://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)

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

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.

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.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.Ted

2nd Year Tier 1 Medical School

Still installing as a hobby...pays for groceries

Compustar Expert