Obd-ii

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  #1  
Old 08-19-04, 09:18 AM
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Question Obd-ii

To DESI501 and/or anyone else with On Board Diagnostics expertise:

I have a 1996 Ford Escort LX Wagon, 1.9L SOHC, Automatic, 106000 miles.
My Engine Check Light is on. I have reset it twice by disconnecting the battery and it has been auto-reset once. I have not had time to perform
any preliminary routine checks. I am planning to pull the plugs and observe their condition and possibly check compression and fuel pressure. My son
has the Escort for a few days while I use his pickup truck.

Is there anything I can do to read the diagnostic codes without an OBD-II computer connection?
 
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  #2  
Old 08-19-04, 09:56 AM
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This was the first year for OBDII in this vehicle
You need a scan tool to read and clear codes
The '95s you could test /a voltmeter and clear codes w/the battery diaconnect
OBDII won't let you
Any Autozones or other DIY places around that'll pull codes for free or a small fee?
 
  #3  
Old 08-19-04, 10:33 AM
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don't waste your time...

...looking at plugs and compression til you know something about the code stored in it. yes...autozone will check it for free, but take anything they say about the code or it's origin with a grain of salt. there's a reason why they check codes for free...they're in the parts business. write down the exact letters and numbers and post here...someone will decipher it for you and help with understanding
 
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Old 08-19-04, 11:56 AM
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Listen to Carguyinva. There is no way to have any clue what code is in there without having it read and no, you can't reset the light without at least a code reader. Get the codes and we'll be able to point you in the right direction and don't throw any money away until you get real advice.
 
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Old 08-19-04, 05:02 PM
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Obd-ii

OK, I will see if my son can get it to an Autozone before he returns it. I'll tell him it's critical to have the codes read ASAP.

As for the engine check light reset, disconnecting the battery does the job, but it's a pain to reset the clock and radio buttons. I can go 100 miles or more before the light comes on again.

Thanks guys.
 
  #6  
Old 08-19-04, 06:33 PM
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Originally Posted by CybersaurusREXX
As for the engine check light reset, disconnecting the battery does the job, but it's a pain to reset the clock and radio buttons. I can go 100 miles or more before the light comes on again.

Thanks guys.
No, it doesn't. You may temporarily put the light out but that means nothing. You cannot clear the codes or reset anything without a scanner on an OBDII vehicle. Government mandate.
 
  #7  
Old 08-19-04, 10:04 PM
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Az

Autozone, #1 in O2 sensor sales, nationwide
(sorry, i thought that was a duh)
 
  #8  
Old 08-19-04, 10:08 PM
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But really

Battery disconnect won't do it
(well, for maybe for 100 miles)
 
  #9  
Old 08-24-04, 07:08 PM
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96 Escort scanned by Autozone

Got it done today. Code is P135.
 
  #10  
Old 08-24-04, 10:32 PM
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O2 sensor heater circuit malfuntion
Could this be an actual O2 sensor failure?
I'm sure these are HEGOs (heated sensors)
Guys?
 
  #11  
Old 08-25-04, 03:42 AM
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Most of the time heater codes do turn out to be bad sensors. Simply unplug the sensor and test for B+ and ground. With a 4 wire sensor, you should have 2 ground wires. If the power and ground supply is good, it's usually a bad sensor.
 
  #12  
Old 08-25-04, 12:06 PM
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2 O2 Sensors

I have 2 O2 Sensors on the 96 Escort LX. One on the exhaust manifold and the other after the CAT. I have a spare sensor for the one on the exhaust manifold, if I can find it. Does the P135 code point to either one or is it more specific?
 
  #13  
Old 08-25-04, 06:09 PM
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Originally Posted by CybersaurusREXX
Does the P135 code point to either one or is it more specific?
Yes, it does. It's a PO135 and it points to Sensor #1 on Bank #1 which is the upper one. When you say you have a spare, I hope you mean "new".
 
  #14  
Old 09-03-04, 12:05 PM
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Thumbs up O2 Sensor

The spare wasn't new and was not the right part. I installed a new one from Autozone. I've only driven about 30 miles since with no problems.

Question: Am I correct in assuming that an Engine Check Light condition causes the ECU to use default settings for ignition timing, fuel injection, etc. and that these defaults are to protect the engine and the environment and are not the most economical settings?
 
  #15  
Old 09-03-04, 01:06 PM
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the computer would use default settings or other sensors to control fuel and timing incase of a failure of a sensor that is important to the engine control such as the o2 sensor but obd 2 will also store codes and turn on the check engine light for transmission related faults and for misfires and other things that may affect the enviroment such as evap leak which has to do with the vapors coming from the cars fuel system so it can alert the driver that there is a problem so depending on the fault the computer may or may not be using a default setting.
 
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