r/s check engine problem, safari 2005

Hi, I have installed my security device and r/s on my van. Almost everything went well, all wire soldered too. I had the wiring diagram provided by autostart for my 2005 GMC Safari.

No door lock no nothing just the basic stuff. The alarm section works well. I have wired in the r/s, the unit crank the engine and the engine start well like it is supposed. But once the engine running, a check engine lights. I tried to go anyway with the lights on but it has been like the speed changed correctly in the tranny but it was like it has rest in the 4th speep and never went down again. No need to say it is imposible to drive with a turtle... So i stop on the side and I cut the tach wire from the brain. Start the engine again, check engine still on but problem disappeared. the light went off after something like 50 km of driving. I tried again to wire it two days after with the same result.

I have a Nordic Start NS5050TW-FM and i know it is working as it was installed in my previous van. I have reset it and relearn the tach signal also at the installation.

The wiring diagram say to wire the purple tach signal from the brain to the white wire coming of the PCM, beside the battery tray. But there is two white wire and both of them have frequency when the engine running. Frequency check with my meter at ac, black lead on the vehicle ground and red lead on to the wire.

anyone knows whats is the deal? Did i take the wrong white wire from the PCM? I did not try to wire in the other white since this is not my van and i would be disappointed to pay a new PCM or something.

Thanks in advance for any help

Battery		RED		(+)		IGNITION SWITCH HARNESS
	Ignition 1		PINK		(+)		IGNITION SWITCH HARNESS
	Ignition 2		BROWN		(+)		IGNITION SWITCH HARNESS
	Accessory 1		ORANGE		(+)		IGNITION SWITCH HARNESS
	Starter 1		YELLOW		(+)		IGNITION SWITCH HARNESS
	Anti-Theft Type		GM PASSLOCK II® ANTI-THEFT SYSTEM
	Anti-Theft Descript		THE BCM MODULE MUST SEE A SPECIFIC RESISTANCE VALUE BEFORE THE VEHICLE WILL START PROPERLY
	Key Sense		LIGHT GREEN		(-)		IGNITION SWITCH HARNESS
	Tachometer		WHITE		(AC)		AT MODULE NEAR VEHICLE BATTERY
	Speed Sense		GREEN / WHITE		(AC)		IN HARNESS ON DRIVERS SIDE OF ENGINE COMPARTMENT
	Parking Lights		BROWN		(+)		AT VEHICLE LIGHT SWITCH
	Brake Lights		WHITE		(+)		AT SWITCH ABOVE BRAKE PEDAL
	Reverse Lights		LIGHT GREEN		(+)		MAIN HARNESS ON DRIVER SIDE FIREWALL

Are these the wires you had...Make sure you connect ALL Ignition and Accessory wires...! When you did disconnect the tach wire...That is all you took off...Or unplugged everything...?

I have only one ignition wire on the the r/s so i have connected only the yellow from the brain to the pink on ignition harness. Should i connect the yellow from the r/s to the pink and onto the white (ignition 2) also?

This is my first installation so I am kind of learning.

also, I have disconnected only the tach wire and stop using the r/s function while I figured what is the problem.

On my wiring diagram, the yellow, red, orange, purple and red. The green (5th relay) is not used.

On the second harness, the black, purple (the one i have disconnect for the moment), grey, orange and yellow are all connected.

on the third harness, the only wire used are the grey and purple for the siren and the door sensoring

I have the ADS-TBSL-PL to bypass the security, which is working well.

Is it possible that the tach wire is disturbing the tach signal going to the PCM and make false reading of the engine rpm therefore preventing accurate speed selection for the tranny?

Ok i will try this.

Just to be sure: when i used the remote starter, the engine crank and start correctly then the starter disengaged. If i push the brakes of open the hood, engine stops. acording to this, the unit works but a check engine pops while the engine is running. So it is not related to the tach wire hooked on the white wire at the pcm?

Thanks for all the help yet. Answer are very quick on the forums. Very appreciated and helpful

Ok I did connect the green wire from the r/s to the brown (ignition 2) even if in my wiring diagram from autostart said it as a white wire. Tommy was right about the color. But the check engine light has pops again at the second remote start attempt. the first attempt was fine.

On Tommy   wiring diagram, he say that the tach signal comes from the white wire at the PCM. I have two white at the PCM. Could I have picked the wrong? Could it be a bad learning of the signal? I'm puzzled

Does someone knows what could it be?

I'm still puzzled. The only white I have is in the steering column harness. In the ignition harness I have a brown which is the same gauge as the +12V, accessory, etc.. The white is in a smalller gauge, looks like a 20gauge  and the brown looks more like a 12 or 10 gauge. I did not try the white to see if there is +12V when I put the key switch at on. Also it is a Safari van. Thanks

I will look if the brown I hook the second ignition shows +12V at accessory position on key switch.