Kwelch02

I have a 02 GT with a manual. I am installing a automatic door lock device. But, I need to know if the Vehicle Speed Sensor sends one signal or two. I need it to send two.

cliffyk

There is no Vehicle Speed Sensor on our cars, only the OSS (Outputshaft Speed Sensor) on the transmission extension housing. The PCM normalizes the OSS signal to 8000 pulses per mile using programmed tire size and axle ratio data and distributes speed and distance traveled data digitally via the OBD2 bus.

It also simulates/generates a hard VSS signal that is output on pin 68 of the PCM connector. That signal is is a square wave (50% duty cycle) of 0 to +12 V (battery voltage) at a frequency of approximately 2.22 Hz/MPH. It is supplied to the cruise control module, and to the audio head unit for the Mach 460 and Mach 1000 sound systems for their automated vehicle speed level controls.

I do not understand what you mean by "one signal or two", it is a single waveform as described.

What make and model is the door lock device? Perhaps they have information online that might better described what the device expects?

Kwelch02

Thank you for helping. Below is the message I received from the manufacturer. The company is dakota digital. They make this device that will automatically lock the electric door locks.

http://www.dakotadigital.com/index.c...rod/prd460.htm



The PAC-3500 can lock the doors at a settable vehicle speed. As for unlocking, the doors will automatically unlock when the ignition is turned off. This will require the PAC-3500 module to be tied into the Vehicle Speed Signal coming from the transmission. Depending on signal type, you may need our SGI-5 Speedometer Interface module to effectively ‘split’ the VSS into two useable signals; one will continue to the ECM/Speedometer as normal, and the other output will run to the PAC-3500. Unfortunately we do not have any information as far as locating the VSS wire, nor regarding the signal-type. A Ford Service manual will be helpful in identifying these items.

cliffyk

Per their installtion instructions the device wants a signal with a frequency of 2000 to 128000 pulses per mile (ppm)--the good news is that the simulated PCM VSS signal of 2.22 Hz/MPH is 7992 ppm.

At 15 MPH the signal would be 2.22 * 15 = 33.3 Hz. And at 15 MPH it would take 4 minutes (240 seconds) to travel a mile, 240 * 33.3 = 7992 pulses per mile;

At 60 MPH the signal would be 2.22 * 60 = 133.2 Hz. And at 60 MPH it would take 1 minute (60 seconds) to travel a mile, 60 * 33.3 = 7992 pulses per mile;

The simulated VSS signal is also quite robust and should not need any buffering to drive another load. Just tap into the white/orange wire anywhere between the PCM and the speed control servo or radio:

cliffyk

I am curious as to why you wish to inflict something like this upon yourself?

My wife's 2003 Highlander factory system did this--it was the first thing I disconnected, drove both of us nuts as you had to unlock the doors manually every time you wanted to get out.

I suppose it might be tolerable with the "unlock in park" feature offered by the Dakota unit...

Kwelch02

thank you