Questionwhen i put the voltmeter on the x or y i don't get any readings... where i get the reading is when i put the positive of the voltmeter above where the ground is (z) is. the reading was 4 long and 6 short. on the x or y there is nothing that happens.
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-----Question-----
I have a 1992 Hyundai elantra and when it starts it has black smoke pour out of exhaust and does not go away i tried using a voltmeter to get a trouble code but all i get is 4long and 6 short readings out of it what should i start changing to get to the problem and is there a better way to look for trouble codes other than the voltmeter
-----Answer-----
The black smoke could be related to your fuel controls or could be due to some mechanical issue. It's important to find out the cause of the check engine lamp first.
I have no code 46 in my fuel system reference information, so I'm figuring you either misread the code or read the transmission codes by mistake. Code 46 in the transmission computer indicates a problem with the pressure control solenoid valve circuit, but this will only cause automatic transmission problems; it won't contribute to black smoke.
The surest solution to reading the engine diagnostic codes is to use a Hyundai scan tool. But I expect you'll need to make a visit to your local Hyundai dealer and pay them to check your codes.
You might also try making a special tool that plugs into the diagnostic connector and has a light emitting diode to flash the codes instead of using the sweep of a voltmeter needle.
I've made a diagram of the diagnostic connector below, including anything relevant to checking diagnostic trouble codes. I'm having trouble getting everything to line up in the font that's used on this site. The vertical lines should be directly lined up one over the other, with an opening two holes wide in the upper half of the diagram. I know this may be confusing. You can see a better diagram in the shop manual at www.hmaservice.com. You'll need to register for a free account, and the site requires Internet Explorer.
__________
|_|_|___|_|_|X|
|Z|_|_|_|_|_|Y|
X: ECM diagnostic trouble code feed
Y: TCM diagnostic trouble code feed
Z: Ground
AnswerI probably should have explained that in some cars the diagnostic connector is turned 180 degrees. What you'll need to do to establish the orientation is to look for the opening that's two terminals wide where the retainer clip would go if plugging a tool into the diagnostic connector. Based on what you've said, if your connector is oriented like I described above, you've read the transmission diagnostic code. (You've got automatic transmission, right?) If that's the case, you should get engine code data from the pin immediately below the one you were checking.
