civicEX1995

hi guys

here is a question.

the saturday i was looking for a problem with my speedometer, it messuring like 40mph in idle.

when I was looking the speed sensor and disconnect it the CEL light on my car dont turn on, is that correct?

my CEL i working well, if i disconnect any other sensor it light on correctly, any suggestion?

BryanM.

iTrader: (1)

The vehicle may have to be moving to set off a CEL.

cvcrcr99

Disconnnect the VSS and go drive around. The CEL will eventually come on.

civicEX1995

ok i will check that, but why if i disconnect the TPS, IAT, EACV or even the ECT the CEL comes on inmediatly?

BryanM.

iTrader: (1)

The ECU is looking for a 0-5v pulse from the VSS. The VSS won't send the 0-5v pulse unless
the wheels are turning.

I've dealt with a couple of bad (OBDI) VSS, and the both wouldn't set off a CEL until a the
car was driven for quite a while.

stevenson_18

did you ever figure this problem out? Im having the same problem now at idle my speedometer is reading 40mph

Former User

If the odometer works, your speedometer is most likely bad.

civicEX1995

i replace the gauge assambly, now the speed meter is messure correct, thx!