Question about 1993 Jeep Grand Cherokee
My jeep did not pass smog. The trouble code reads 1221. What does this mean and how do i fix it?
1993 is OBD1 and as 2 digit codes, so comment is wrong.
and the keyon blink codes takes no scan tool, in drive way.at home.
my guess it was 12 and 21. (2 codes are stored !) NOT 1.
12 is battery disconnected error, (due to service)
21. is oxygen sensor failure not TPS. (i didnt say replace it)
why not read a real FSM. click Emission chapter.
code 21 has extended data with real DRB jeep scan tool (
tells you what part of OXY DTC 21 fails (slow, shorted, dead , open , stuck high , stuck low,etc) the flash codes can NOT do that.
which engine? method varies by that. 4.0:?
this is covered in the FSM.
tells you too, how to do the calibration
if by chance (commenter answers for OBD2 code 1221 , tps)
no engine on any 93 jeep is 0BD2, so comment above is dead wrong , sorry fella, it is.
so never ask here. as they dont know years, here i guess.
the commenter added the p FOR p1221. (FAIL)
ONLY OBD2 HAVE P CODES (POWER TRAIN)
BY LAW 1996+ all cars USA are OBD2. this one not.
Some cars started early(smart companies...) and not jeep.
now we go to the real problem. what is wrong, that is easy in concepts 101:
1: 02 sensor bad. (get jeep to scan it and find true sub code DTC)
1a: exhaust leaks near it... LOOK and Listen with hose to ear.
2: or engine runs bad. making 02 read wrong.
50 + causes. even a leaking injector or burned exhaust valve.
no need to guess, we do a battery of tests. to find this.
all cars, same for EFI Gasoline, same answer.
until 1996 when the scan tool shows vastly more DTCs and vastly better reasons,
But there are execptions,
Few ever read the FSM an fewer , even less read the DRB
parts, about the extended hex codes. DRB shows.
so my point, is this, yes any tool could read it, and most don't
but in life, there are always exceptions, and the below is 1.
Some newer scan tools can do this. but will cost you $200
i have one, and Innova. (ask)
Worth every penny if working old OBD1 cars. sure is.
I will save you $200 the first time you dont visit the dealer.
here is the right tool
how do you like my post. better huh? no lies?
Posted on Dec 07, 2014
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Posted on Jan 02, 2017
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