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1993 Ford Taurus Codes

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Dec 1, 2011, 2:47 PM

Post #1 of 2 (4196 views)
1993 Ford Taurus Codes Sign In

My car is a 1993 Ford Taurus SHO, 3.2L
It has 136,000 miles on it.

The check engine light usually comes on after about 5 minutes of driving and then takes turns being on and off in about 5 or 10 minute intervals.

I ran a KOEO scan. These are the codes that I got:

In my code scanner manual it says "before continuous memory codes can be serviced, both the KOEO and the KOER Self-Tests mus pass a code 11 or 111" Does that mean that I can only service the 327o code? Since all the others have a "c" (continuous memory code)

In my manual, this is what it shows that the codes mean
327o - EGR valve position circuit below minimum voltage
176c - HEGO (HO2S) sensor fault/not switching, or fuel system at adaptive limits
177c - HEGO (HO2S) sensor fault/always rich
327c - EGR valve position circuit below minimum voltage
543c - Fuel pump secondary circuit fault

When I drive my car, I sometimes feel like there is not enough power when going up hills. My car used to stall sometimes when idle, but stopped once I cleaned out the throttle body, but the rpms still act a little funny at times. When I turn on my engine and open the hood, I hear a rattling noise but can't figure out where it is coming from.

Ultimate Carjunky / Moderator
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Dec 1, 2011, 6:19 PM

Post #2 of 2 (4160 views)
Re: 1993 Ford Taurus Codes Sign In

There are three self test states that the engine computer (EEC-IV) uses to test the operation of various sensors, relay, actuators, and their corresponding circuits.

The first is KOEO (Key on engine off) test. That test when enabled allows the computer to check sensor outputs when the engine is off. If there isn't any wacky readings the computer sees when it is in that state, it will set a pass code or 11.

The next state is KOER(Key on engine running). In this state the engine is running and the computer force commands various actuators and looks for undesired responses. If everything passes in the KOER state, the computer will set a pass code.

The last state is continuous self test monitoring state. This is the state the computer is in under normal operation of the engine without the computer being in KOER or KOEO. If a problem occurs in this state, the computer will store a code in KAM (Keep alive memory) and turn the check engine light on.

Hard continuous codes need to be serviced first because they are set in KAM and turning the light on.

The C codes should be the first thing you should diagnose. Once you resolve those problems, you clear the KAM and then run your KOEO and KOER tests to see if anything fails.

Your going to need trouble charts and diagnostic information to be able to trouble shoot those problems. I recommend that you either subscribe to online service information such as ALLdata DIY or one of the other service information providers. Chilton or Haynes manuals will be pretty elusive in their information when attempting to troubleshoot those codes.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

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