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Vehicle Speed Sensor Issue
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zmasterflex
User
Oct 23, 2008, 7:41 PM
Post #1 of 3
(1612 views)
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Vehicle Speed Sensor Issue
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1996 Isuzu Oasis (same as honda odyssey) 2.2L.
Greetings all. Instrument cluster fuse blew 2 months ago I first replaced it now. Check engine light comes on,
diagnostic says code is for VSS. I replaced the VSS today but the light didn't go off. In the past I have just disconnected the battery to turn the check engine light off. Today that isn't working. Is there something different about the VSS code that needs to be shut off by the computer? or is it because I drove for two months with the speedometer off? Inspection is before the end of the month, any help would be appreciated before I have to pay for another diagnostic.
THANKS SO MUCH!!!!
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DanD
Veteran
/ Moderator
Oct 24, 2008, 3:41 AM
Post #2 of 3
(1601 views)
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Re: Vehicle Speed Sensor Issue
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Is the speedo working now?
There are a few different scenarios that maybe causing this.
- If the speedo is working now; it may take three or more drive cycles, without a fault occurring before the PCM will turn the light off. A drive cycle consists of driving at varied speeds, at or above 60klm an hour with the engine reaching operating temperature, stopping the vehicle and turning the engine off. That is one drive cycle.
- There’s possibly another problem with the system and the light is on because a different fault has been detected? In other words the PCM has set a second code dealing with whatever, since the last time the codes were read?
- If the speedo’s not working; then it’s still broke (sorry for stating the obvious). You’ve change out a good sensor, when the problem lies in the wiring, instrument cluster or the PCM?
With the light staying on, means the problem is a hard fault/code; meaning something is broken right now and the PCM can see or thinks it sees a fault.
Hard faults are usually fairly easy to diagnose; by going step by step through a set test procedure, you will come across the cause of the fault.
Not like a soft fault/code where the problem is intermittent and may take one, two or more days worth of driving before the code sets again; turning on the light.
Intermittent faults are a technician’s nightmare; what do you repair/replace if the fault is not there with the test equipment connected?
It’s kind of like watching paint dry or waiting for that light bulb to burn out in your bathroom; leaving you in the dark, at the worse possible time. You know it’s going to happen; you just don’t now when or at times why?
Dan.
Canadian "EH"
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zmasterflex
User
Oct 24, 2008, 5:18 AM
Post #3 of 3
(1594 views)
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Re: Vehicle Speed Sensor Issue
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Thanks for the quick reply. The speedo was working even before I swapped out the VSS. Now that you mention this drive cycle business, I probably didn't even need the new sensor I guess I just needed to drive start etc. What I don't understand is why would the light stay on longer for the VSS, more than any other fault, in the past the check engine light has gone out quickly after fixing problems. Thansk for the help, inspection is this week so I'll get another diagnostic. So long.
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