2000 sentra r/s no tach signal

This is for a 2000 Nissan Sentra 2.0. I just installed the DEI 556U to bypass the immobilizer and can get the car to start up with the remote but it shuts down after about 20 seconds. Then it tries to start up again, runs for 20 seconds and shut down again and so on.. I read that the tach wire needs to be hooked up. I found misleading information from a number of sources so I'm a bit confused. According to the factory service manual I can get the RPM from the instrument cluster at pin 45 which is a solid green wire. I tried that wire but the unit still doesn't recognize the signal. I even tried to find a wire with 2-7 volts [ac] with a multi meter but none of the voltages increased with the engine speed. How else can I make the tach signal be recognized?

Thanks for the response. I was kinda hoping I wouldn't have to run the wire all the way from under the engine bay. According to the manual it says: Violet/White Wire: Tach input/constant power input wire. This input provides the module with info about the engines rpm. Note: This wire has the same function with the constant power snensing input so is is an alternative solution when tach input does not supply proper signal. If connected to the constant power sensing input, it is an easy way to sense if the remote start has been successful [tachless method]. If Im reading that correctly, thats the same as voltage sense? So basically I could just connect the violet/white wire to an ignition wire? Or if not, how should I wire it?

monday morning bump!! Would like to finish the install today but need to figure out this tach signal problem or how to make it read voltage instead

i suggest tach, but it you must use voltage sensing, it seems to always work best if its connected right to the battery under the hood with a fused lead. so, i say if you gotta go under the hood anyway might as well go for the tach wire.

ckeeler wrote: i suggest tach, but it you must use voltage sensing, it seems to always work best if its connected right to the battery under the hood with a fused lead. so, i say if you gotta go under the hood anyway might as well go for the tach wire.

So constant power input is the same thing as voltage sense? the unit is just looking for a 12-14V input when the car is started? Wouldn't I just be able to tap the wire into the ignition wire on the steering column? The reason I'm trying to avoid under the hood is because it's pretty cold outside here in the North East and I don't have access to a garage to mess around under the hood.

What unit are you trying to install? the ones ive done monitor the voltage with the vehicle at rest and then check it again after remote starting to see if there is an increase in the voltage. thats how it knows its running. its that higher voltage it needs to see. thats also why ive had better luck going right off the battery.

ckeeler wrote: What unit are you trying to install? the ones ive done monitor the voltage with the vehicle at rest and then check it again after remote starting to see if there is an increase in the voltage. thats how it knows its running. its that higher voltage it needs to see. thats also why ive had better luck going right off the battery.

It's just an Ebay special remote starter unit with alarm. I will try hooking it up to read voltage and see what happens. Thanks for the help.

OK so I connected the signal wire to the ignition wire on the steering column and tested the signal thru the alarm. I got the beeps from the horn which according to the manual meant that it accepted the signal. I remote started and it shut off again after 5 seconds. I said to myself..wth!! THEN I realized something-I forgot to connect the wire for the hood pin switch. According to the manual the unit will shut down if it suspects the hood is open. I think once I connect the hood sensor I should be up and running. What do you think?

the hood pin needs to be connected for sure.......but it wont fix this problem because if it was disconnected the unit cannot see the hood as being open anyway. i think this is a problem with your 556U