trouble code on 97 wrangler 4 cylinder P0112

Enjunco8 did pass the time by typing:

First off: Remove and clean the MAT sensor plug and the plug for the coolant temperature sensor. Corrosion buildup will make the sensor read cool.

If you have an Ommeter you can measure the MAT sensor resistance.

be the same for your year and engine, but you might wantto doublecheck with google.

screw it up on top of the windshield i'm sure it will be way higher than necessary! :))

P0012 on a '97 TJ??? That kind of code is normally only out of newer TJs, where did you get that code from?

Jerry

It's an OBDII DTC. Just what I'd expect to get from an OBDII vehicle.

Yeah on later TJs but not on the '97 TJ. I have a '97 and they don't use OBDII codes. OBDII started sometime around the '98 model year.

Jerry

OBDII started in '96.

Regardless of when OBDII and OBDIII started, the '97 doesn't use those codes... they started sometime around the '98 model year.

Jerry

Wrong again.

Put a scan tool on a '96 or later vehicle with an emissions fault and you'll get a "Pxxxx" code. Uniform fault codes are a part of OBD II and that's the way it works.

WTF is wrong with you when you are guessing what the '97 TJ uses? I OWN a '97 and the '97 doesn't use the 'P' codes, they weren't used until around '98.

The '97 uses the codes as found at ftp://rtfm.mit.edu/pub/usenet/rec.answers/autos/chrysler-faq/general/part3

Jerry

And then folks wonder why the $tealers have such a bad rep. This one 'really' has a problem with them there trouble codes.

Mike

Jerry Bransford wrote:

i can pull p codes on my 97 with my obdII

ftp://rtfm.mit.edu/pub/usenet/rec.answers/autos/chrysler-faq/general/part3

But the '97 (at least MY '97) doesn't generate or display them with its onboard computer. It displays these... ftp://rtfm.mit.edu/pub/usenet/rec.answers/autos/chrysler-faq/general/part3

Jerry

Jerry the codes may not read "manually" in your Jeep But a code reader may read them. Does your Jeep have a plug for a reader? From what I understand the older Jeeps flash the check engine light for codes whereas my 01TJ shows the code on the electronic odometer. Would it then be true that both vintages have a plug for a reader? Not an informed expert here, just curious Cheers Frank

Jerry Bransford wrote:

Frank, the '97 can display its own diagnostic codes on the odometer display by only turning the ignition key on-off-on three times within five seconds. While there were a few years when the TJ could not do that, that ability was brought back in later TJs.

Jerry

You should really stick to subjects you have a clue about.

It's amusing that you accuse me of guessing, when you're the one doing all the guessing...

You guess that because you 'own' a TJ this makes you some sort of 'expert'. Do you 'own' an OBD II scan tool? I didn't think so...

You guess that just because you've never seen a 'P' code, yours doesn't 'use' them.

You guess that because you can turn your key off and on just right, and you can count the check engine light flashes, those are the only codes that exist.

Wrong again...

A couple of facts for you:

If you can figure out how to get your hood open, take a look at the emissions information label. You'll see that your '97 TJ is OBD II Certified. In order to be OBD II certified, among other things, it must store OBD II compliant Diagnostic trouble codes, and they must be able to be read using an OBD II compliant scan tool. In case this is still over your head, that means that the DTCs take the 'Pxxxx' form.

Yes, your TJ does store 'P' codes.

I figured you'd be here soon. Nobody is as proud to show off their ignorance as you are.

Now run along and do something useful. I haven't seen the charter in a while, why don't you go post it.

Damn, you need to go look at a '97 TJ before you post stuff you don't have direct experience with. The '97 TJ displays the diagnostic codes I already gave you the link to directly in the odometer, you don't count the flashes. If you bothered to READ the data on the link I gave earlier, you would see the codes that the '97 TJ gives DIRECTLY on its odometer. Even though the flashes also correspond to the numeric codes given in the odometer.

Did you even fawking bother to go to the link I gave earlier to see the codes? Or did you ignore them because they don't agree with your claim?

But they never lost the ability to store 'P' codes, just as any other OBD II vehicle would.

You fawk, now you're backpedaling. I have been saying all fawking-along that the '97 TJ DOES NOT DISPLAY P-CODES when displaying its own codes!!!!!!!!!!!!!!!!! Now you're just saying it "stores" them... which is NOT the same as displaying them... or what an owner can display without an external reader.

Since you obviously didn't bother to go to the link I gave you, here are the codes a '97 displays. The TJ did NOT START DISPLAYING P-CODES until the '98 model year.

COMPUTER CODES

THESE ONLY WORK IF YOU HAVE FUEL INJECTION. Otherwise, see the web site or the "troubleshooting electronic feedback carburetors" section.

Start with the ignition off. Within five seconds, switch the key on, off, on, off, on. (On is *not* start!)

The "check engine" light will flash. Count the flashes Each code is a two digit code, so a (for example) 23 would be FLASH FLASH FLASH FLASH FLASH

It will never flash more than 9 times, watch for pauses!

55 is end of codes, 33 is normal if you don't have air conditioning.

When the computer indicates major failure, it will activate Limp In mode, which guesses about data to compensate for sensor failure.

*** NOTE - NEWER VEHICLES ***

See

for a new, revised list ofcomputer codes and instructions on how to get them. These codes appear tohave been phased in starting in around 1998.

***

Please note that some codes are NOT included below, this is not a complete listing. (From Herb with additions by Charles Hobbs. Basis: Mopar Mailing List info.)

• Activates Power Limited/Check Engine light.

11 No ignition reference signal detected during cranking (bad Hall effect) OR timing belt skipped one or more teeth; OR loss of either camshaft or crankshaft position sensor

12 Battery or computer recently disconnected - Fraser Shortt said code 12 appeared with some other codes in 1989 and possibly later computers as well. 13* MAP sensor or vacuum line may not be working 14* MAP sensor voltage below .16V or over 4.96V

NOTE - on early Neons, a computer error may light the Check Engine light and show one or more of these codes. If this happens, bring it in so the dealer can reprogram the computer (about ten minutes).

15 No speed/distance sensor signal 16* Loss of battery voltage detected with engine running 17 (1985 turbo only): knock sensor circuit 17 Engine stays cool too long (bad thermostat or coolant sensor?)

21 Oxygen sensor signal doesn't change (stays at 4.3-4.5V) Probably bad oxygen sensor

22* Coolant sensor signal out of range - May have been disconnected to set timing 23* Incoming air temperature sensor may be bad 24* Throttle position sensor over 4.96V (SEE NOTE #3) 25 Automatic Idle Speed (AIS) motor driver circuit shorted or target idle not reached, vacuum leak found 26 Peak injector circuit voltage has not been reached (need to check computer signals, voltage reg, injectors) (SEE NOTE #4 BELOW) 27 Injector circuit isn't switching when it's told to (TBI) OR (MPI) injector circuit #1 not switching right OR (turbo) injector circuit #2 not switching right OR (all 1990-) injector output driver not responding - check computer, connections

31 Bad evaporator purge solenoid circuit or driver

32 (1984 only) power loss/limited lamp or circuit 32 EGR gases not working (1988) - check vacuum, valve 32 (1990-92, all but Turbo) computer didn't see change in air/'fuel ratio when EGR activated - check valve, vacuum lines, and EGR electrical 33 Air conditioning clutch relay circuit open or shorted (may be in the wide-open-throttle cutoff circuit) 34 (1984-86) EGR solenoid circuit shorted or open 34 (1987-1991) speed control shorted or open 35 Cooling fan relay circuit open or shorted 35 (trucks) idle switch motor fault - check connections 36 (turbo) Wastegate control circuit open or shorted 36 (3.9/5.2 RWD) solenoid coil circuit (air switching) 36 (Turbo IV) #3 Vent Solenoid open/short 37 Shift indicator light failure, 5-speed OR part throttle lock/unlock solenoid driver circuit (87-89) OR solenoid coil circuit (85-89 Turbo I-IV) OR Trans temparature sensor voltage low (1995 and on; see NOTE 2)

41* Alternator field control circuit open or shorted

42 Automatic shutdown relay circuit open or shorted 42 Fuel pump relay control circuit 42 Fuel level unit - no change over miles OR 42 Z1 voltage missing when autoshutdown circuit energized (SEE NOTE #6) 43 Peak primary coil current not achieved with max dwell time OR 43 Cylinder misfire OR 43 Problem in power module to logic module interface 44 No FJ2 voltage present at logic board OR 44 Logic module self-diagnostics indicate problem OR 44 Battery temperature out of range (see Note #1!) 45 Turbo boost limit exceeded (engine was shut down by logic module) 46* Battery voltage too high during charging or charging system voltage too low 47 Battery voltage too low and alternator output too low

51 Oxygen sensor stuck at lean position (lean condition) OR

51 Internal logic module fault ('84 turbo only) 52 Oxygen sensor stuck at rich position (SEE NOTE #5!) OR 52 Internal logic module fault ('84 turbo only) 53 Logic module internal problem 54 No sync pickup signal during engine rotation (turbo only) OR 54 Internal logic module fault ('84 turbo only) 55 End of codes

61 "Baro" sensor open or shorted

62 EMR mileage cannot be stored in EEPROM 62 PCM failure SRI mile not stored 63 Controller cannot write to EEPROM 64 Catalytic converter efficiency failure 65 Power steering switch failure

88 Start of test (not given on most computers)

Did you notice any P-Codes above? Not a fawking one.

Now go back into your hole where you can display your own P-Codes.

Oh... do read the above section marked "*** NOTE - NEWER VEHICLES *** which I have quoted for you below...

computer codes and instructions on how to get them. These codes appear to have been phased in starting in around 1998."

Pretty much what I have been saying, that the P-Codes became displayable in '98... all along.