testing vss wire

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resquchas

Copper - Posts: 93

Joined: April 15, 2010

Location: Virginia, United States

Posted: January 01, 2011 at 1:41 PM / IP Logged

how to you know if you have the correct VSS wire. Is there a danger of getting the wrong one? Tach makes sense, because if you start the motor and rev it you see a change on DMM( I read the AC vs DC argument awhile back, whew, you guys are geniuses)

The RIGHT way is the ONLY way.

i am an idiot

Platinum - Posts: 13,667

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: January 01, 2011 at 2:46 PM / IP Logged

You check for VSS the same exact way. It is a pulsating DC voltage, depending on the quality of your meter, it may only register on one or the other, AC/DC, but one will show an increase in voltage the faster the car is driven. Tag the wire and have someone drive the vehicle while you watch the meter.

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: January 01, 2011 at 3:36 PM / IP Logged

Be careful doing this but it should start reading after about 1.5 mph. What vehicle and year please.

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: January 01, 2011 at 3:39 PM / IP Logged

At last, some one who asks sensible questions.

Once tried to find this on a Jaguar, did it static with the car jacked up, only to find the anti slip kept cutting in...doh.

resquchas

Copper - Posts: 93

Joined: April 15, 2010

Location: Virginia, United States

Posted: January 01, 2011 at 3:41 PM / IP Logged

that makes sense guys thanks. So if alone then you just have to go by a wiring diagram or, do a check in parking lot( safely) If I do not see the DMM signal I want then, try another.

The RIGHT way is the ONLY way.

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: January 01, 2011 at 6:05 PM / IP Logged

It's probably not needed, most current Sat Nav head units don't need it.

i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: January 01, 2011 at 6:47 PM / IP Logged

I agree with Howie, the only time any reputable brand unit uses the VSS is when it loses GPS signals. The only time it is needed is in parking garages or tunnels. The nav unit has a magnetic compass and it uses the VSS to kind of keep track of your location until GPS signal is obtained, then it will correct your exact location.

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: January 01, 2011 at 6:54 PM / IP Logged

Also modern units have gyros and extremely good software that recognises the vector from the gyroscopes, coming out of a tunnel nowadays, it takes about 2 seconds to regain its position.

Couple of years ago that would have been 2 mins.

resquchas

Copper - Posts: 93

Joined: April 15, 2010

Location: Virginia, United States

Posted: January 01, 2011 at 8:11 PM / IP Logged

I think a 2 second refresh period is very acceptable. Would or do alarm/RS systems make use of VSS wire for convenience features like automtic door locking upon motion. I do not know what that would do at a stop light though unless the unlock is upon removing key... just curious.

The RIGHT way is the ONLY way.

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: January 02, 2011 at 4:27 AM / IP Logged

Clifford G5 and I believe Compustar use tach sensing for RPM/engine load not speed dependant locking.

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