Check Engine Light but no codes - JeepForum.com
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post #1 of 35 Old 10-06-2021, 12:52 PM Thread Starter
brandonse24
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Check Engine Light but no codes

I have her to a point that I can drive her but when I'm accelerating the check engine light comes on. There is not loss of power and if I let off the gas it goes away seems to do it in the 3-4k rpm range no matter the gear. I replaced the crank sensor, map sensor and the plugs but no change. I checked for codes but none are stored. I was thinking of doing the cap, rotor, wires and Coil but I don't want to just shoot the parts cannon as it is getting close to Christmas time. Anyone run across this before?


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post #2 of 35 Old 10-06-2021, 03:58 PM
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is it possible that your shift light is plugged into the wrong slot or something along those lines?

...or... did this just occur spontaneously without changing anything at all prior to its first occurrence?

~YJOTM MAY '16, JULY '19~


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post #3 of 35 Old 10-06-2021, 04:55 PM
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Interesting.

Hows your oil pressure at those RPMs?

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post #4 of 35 Old 10-06-2021, 04:55 PM
jbolty
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is a 92 OBD2? if it is, a leaky gas cap can throw an evap code that clears pretty quick

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"The right to be heard does not necessarily include the right to be taken seriously." —Hubert Humphrey
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post #5 of 35 Old 10-06-2021, 05:06 PM
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Originally Posted by jbolty View Post
is a 92 OBD2? if it is, a leaky gas cap can throw an evap code that clears pretty quick
Without a swap to cherokee or tj 91-95 YJ is OBD1

[size=“3”]Shackles & D-rings are different things.
Cranking IS turning over
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post #6 of 35 Old 10-06-2021, 06:36 PM
Boojo35
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Quote:
Originally Posted by bruinjeeper View Post
is it possible that your shift light is plugged into the wrong slot or something along those lines?

...or... did this just occur spontaneously without changing anything at all prior to its first occurrence?
This was my first thought.

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #7 of 35 Old 10-06-2021, 06:51 PM
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Quote:
Originally Posted by Boojo35 View Post
This was my first thought.
the OP did note in another thread he just recently picked this Jeep up.

it's a decent first thought, sir

~YJOTM MAY '16, JULY '19~


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post #8 of 35 Old 10-06-2021, 07:21 PM
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Quote:
Originally Posted by bruinjeeper View Post
the OP did note in another thread he just recently picked this Jeep up.

it's a decent first thought, sir
Nope. It is more than decent. It made me very proud of my North of the border buddy. You are a thinker. You have a clue...

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #9 of 35 Old 10-06-2021, 08:54 PM Thread Starter
brandonse24
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Yeah I have no idea what was done to this thing before I got it. I know it has a salvage yard motor because of the paint markings. I ended up have to buy a reman trans for it (yea its still an AX5) because the main shaft was snapped and 2 of the gears were blown apart. I wasn't aware the 92s had a shift light. Could they have crossed a wire so the shift light and the check engine light both use the same bulb?

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post #10 of 35 Old 10-09-2021, 08:02 AM
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Originally Posted by brandonse24 View Post
Yea. Could they have crossed a wire so the shift light and the check engine light both use the same bulb?
Hard to do with the molded plug, if I recall correctly but anything is possible with folks.

[size=“3”]Shackles & D-rings are different things.
Cranking IS turning over
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post #11 of 35 Old 10-10-2021, 10:38 AM
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The CEL comes on with the ECM grounding the circuit. Wiring issue or an ECM that is wonky.
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post #12 of 35 Old 10-18-2021, 03:52 PM Thread Starter
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Ok, Messing around online and with the jeep it seems like my cluster is different or not right?
From what I can see online the shift light should be on the bottom left in the panel with the check engine next to it and the left turn light above it.
well the bottom left corner is where my Check engine light is. anyone got any Ideas?

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post #13 of 35 Old 10-18-2021, 04:41 PM
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it may have been a switched up face display by the OP.

You said it was bottom left, and the shift light is bottom left in other photos you observed.

See where i'm going with this?

p.s have to do it - Let's Go Brandon!

~YJOTM MAY '16, JULY '19~


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post #14 of 35 Old 10-18-2021, 04:49 PM Thread Starter
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I went out there and took the cluster out and completely apart. Its not original either as its got a junkyard part number on it. (from what I can find it has to be atleast from a 94 because it has an ABS light, and this one has the shift light bottom middle) I did find however that 1/2 the bulbs were missing (thank goodness I had some new ones in packs). Did not realize I had a check engine and a maintenance light. but regardless I was actually able to pull codes since the maintenance required light flashed for me and not the check engine light. so now I get to play hunt the codes Progress

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post #15 of 35 Old 10-18-2021, 04:58 PM Thread Starter
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12*: Battery or computer recently disconnected within the last 50 start cycles). This is a very common code. Will not trigger a "Check engine light". (Ok put 17 miles on it since most drives are tests)

22**: Coolant temperature sensor signal above or below acceptable voltage. (new temp sensor but still not reading on the gauge so makes sense)

23**: Intake air temperature sensor signal above or below acceptable voltage. (maybe the problem with the light coming on when rpms are up under load?)

33*: Air conditioning clutch relay circuit open or shorted. If your Jeep doesn't have AC you will always get this code. Will not trigger a "Check engine light". (No A/c dang it)

55*: PCM has finished telling you the codes. This means you are done reading codes.

Any Ideas on my progress and what to check or look at next?

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