Check Engine Codes

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Check Engine Codes

December 16, 2011, 09:31:36 PM

Ok I have a 88 TC and am trying to get the codes taken care of. Need some help figuring it all out.

27-Vehicle speed sensor or edis fault (Speedo works and of course no edis)
41-HEGO fault (new oxygen sensor)
42-HEGO Fault
72-System power circuit fault: Message center control assembly circuit failure

Any Help would be nice. Thanks

Check Engine Codes

Reply #1 – December 17, 2011, 02:08:43 AM

Clear codes. The o2 sensor code may not have cleared.

Check Engine Codes

Reply #2 – December 17, 2011, 02:56:01 AM

while the codes are dumping out, at that moment remove the jumper wire you have installed or the tool and then also unhook the battery.

are these codes in the first group or the second group?????? ,,, ie- first group is codes going on now, second is codes stored in memory for 40 warm up cycles

Check Engine Codes

Reply #3 – December 17, 2011, 08:48:06 AM

Ok I guess I should have added this. The battery was unhooked for about an hour while changing the sensor. After that I drove about 15minutes to the store and 15 minutes back home and the light came back on. I have a code reader I did not use a jumper wire.

Check Engine Codes

Reply #4 – December 18, 2011, 11:49:21 AM

no help here,, id have to have the car to see if its really worth all the time to find the fault.
so many codes daisy chain into other parts of the car causing other codes to appear.

Even vacuum actuated solenoids can trigger codes to devices up or down stream of the failed part.

Are these codes a part of the first group or the second group?

there is a pause where you dump the first group then the second ,, if these are in the second group, then dont worry about them.

On thing you can do which is cheap and honestly its never done by many is this.

get a can of wd 40 and unload it inside every vac line you have.
the vac lines go to pieces parts that have rubber o-rings or moving solenoids that would appreciate some lubrication, it may actually help drop one or two of your codes.

this is a hard one to solve man, start with the O2 and even though it is new, its signal is also tied to the map sensor along with a lot of other things. Perhaps swapping the MAP might help, map sensors are complicated creatures and i really dont totally understand their full operation.

Check Engine Codes

Reply #5 – December 18, 2011, 02:16:42 PM

I will try the WD-40. It does have a intermittent high idle problem. It got better after fixing some vacuum lines but still does it some times.

Check Engine Codes

Reply #6 – December 19, 2011, 08:49:44 AM

spray carb or brake cleaner along the vac lines while at idle and when you spray along the right spot, the engine will surge. That will help pinpoint an area that is broke , cracked or loose.

Check Engine Codes

Reply #7 – December 19, 2011, 01:09:13 PM

Fir