Vss help needed.
Vss help needed. I am having problems with my vss. I have a Dakota digital 8k pass threw pulse generator. It has two wires and the vss plug coming from engine harness also has two wires. I hooked the wires up and my ECM is only seeing 4 mph when my mechanical speedo says 65. Any ideas?
The standard VSS puts out 17 - 40 pulses per rev. As you figured out, the DD putss out significantly less. Some tuning software can adjust that low (Brendan at LT1swap was able to correct mine).
If you want it corrected so that DBW cruise control will work, dont bother. The pulse rate is too low for a stable signal. If you want it corrected so that you wont have stalling problems, it doesn't have to be accurate.
If you want it corrected so that DBW cruise control will work, dont bother. The pulse rate is too low for a stable signal. If you want it corrected so that you wont have stalling problems, it doesn't have to be accurate.
Yes stalls alot. Not so bad if i get over 15 mph then slow down. But backing up or moving slow it stalls almost everytime. Ecm does not see speed tell i get over 15 mph and the ecm sees 1 mph.
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The DD pulse rate is too low for a stable signal. When CC was engaged the car would either run wide open or zero throttle. Btw, that was a bit of a shock the first time. I confirmed the ecu was generally reading close to correct speed, but at high sample rate, it would read high or low by about 20mph. Not sure if there are any bandaid fixes. I ended up running an aftermarket VSS off the T10 trans 39 tooth reverse gear.
