'98 cl speedometer works intermittently
 

Hi all,

I'm working on my girlfriend's daughter's car. It's a '98 2.3 cl, auto trans. The transmission was recently rebuilt, and I have the cylinder head off to get a probable leaking exhaust valve on #1 fixed. (a leakdown test had that one blowing air into the intake manifold.)

Anyway, the speedometer works intermittently. It does not default to 20 mph like I read about on the internet a lot, it simply drops to zero. I suspect that one of the speed sensors might be bad, but I don't want to go replacing sensors without checking to see that it's not a simple bad ground or something. The haynes manual I got on the same year accord shows a different sensor, one with a gear. The ones on this car are much smaller, and located more to the passenger side of the transmission. The test procedure it outlines also mentions checking for the 5v reference voltage on a color wire that does not go to the sensors on this car. So, I can only assume that an accord does not use exactly the same sensor as this acura.

If any of you have an appropriate procedure for testing the speed sensor(s) on this car I sure would appreciate it. I don't have an oscilloscope, but I do have a basic digital voltmeter and some electrical skills.

Nobody knows?