TJ Error Codes

[XtrmTJ]

I got a "check engine" lite after returning from EJS. I did the on/off, on/off, on trick and got thease error codes, 12, 21, 42, 55. Can anyone explain to me what thease are, in simple easy to understand terms please. TIA !:hi:

 

[NotMatt]

What year is your rig?

 

[XtrmTJ]

1997 Jeep wrangler (TJ) 4.0 MPFI, TF999

 

[olllllllo]

Go get it scanned and get the P codes to give you a little better idea of what is going on.

12 is normal, 55 means the end of codes.


P codes are here: http://www.getahelmet.com/jeeps/tech/codes/


11 No crank reference signal detected during engine cranking. Intermittent loss of either camshaft or crankshaft position sensor. CKP sensor target windows have too much variation.
12 Direct battery input to PCM was disconnected within the last 50 Key-on cycles.
13 No difference recognized between the engine MAP reading and the barometric (atmosphere) pressure reading from start-up.
14 MAP sensor input above or below acceptable voltage. 5 volt output to MAP sensor open.
15 No vehicle speed sensor signal detected during road load conditions.
17 Engine did not reach operating temperature within acceptable limits. Engine does not reach 20º F. within 5 minutes with a vehicle speed signal.
21 Upstream oxygen sensor response slower than minimum required switching frequency. Upstream oxygen sensor heating element circuit malfunction. Downstream oxygen sensor heating element circuit malfunction. Downstream oxygen sensor input voltage maintained above the normal operating range. Oxygen sensor voltage too low, tested after cold start. (Upstream or Downstream) Left oxygen sensor input voltage maintained above the normal operating temperature.
22 Engine coolant temperature sensor above or below acceptable voltage.
23 Intake air temperature sensor input above or below acceptable voltage.
24 Throttle position sensor input above or below acceptable voltage. TPS signal does not correlate to MAP sensor.
25 A shorted or open condition detected in one or more of the idle air control motor circuits. Actual idle speed does not equal target idle speed.
27 Injector #3, and/or 4, and/or 5, and/or 6 output driver does not respond properly to the control signal.
31 An open or shorted condition detected in the A/C clutch relay circuit. Insufficient or excessive vapor flow detected during evaporative emission system operation.
33 An open or shorted condition detected in the duty cycle purge solenoid circuit.
34 An open or shorted condition detected in the Speed Control vacuum or vent solenoid circuits. Speed control switch input below the minimum acceptable voltage.
37 Relationship between engine speed and vehicle speed indicates no torque converter clutch engagement. An open or shorted condition detected in the torque converter part throttle unlock solenoid control circuit. Incorrect input state detected for the Park/Neutral switch. Auto only.
41 An open or shorted condition in the generator field control circuit.
42 An open or shorted condition detected in the auto shutdown relay circuit. An open condition detected in the ASD relay output circuit. An open or shorted condition detected in the fuel pump relay control circuit. An open circuit between PCM and fuel gauge sending unit. Circuit shorted to voltage between PCM and fuel gauge sending unit. No movement of fuel level sender detected.
43 Peak primary circuit current not achieved with maximum dwell time. Misfire detected in one or more cylinders 1 thru 6. (4 and 6 cyls.)
44 Battery temperature sensor in voltage above or below acceptable range.
46 Battery voltage sense input above target charging voltage during engine operation.
47 Battery voltage sense input below target charging during engine operation. Also, no significant change detected in battery voltage during active test of generator output circuit.
51 A lean air/fuel mixture has been indicated by an abnormally rich correction factor.
52 A rich air/fuel mixture has been indicated by an abnormally rich correction factor.
53 PCM Internal fault condition detected.
54 No camshaft signal detected during engine cranking.
55 Completion of fault code display on Check Engine lamp.
63 Unsuccessful attempt to write to an EEPROM location by the PCM.
64 Catalyst efficiency below required level. (Same as code 72)
65 Power steering high pressure seen at high speed. (2.5L only)
72 Catalyst efficiency below required level. (Same as code 64)
77 Malfunction detected with poser feed to speed control servo solenoids.



If those dont answer your question, a 1" piece of black electrical tape does wonders. :redneck:

 

[XtrmTJ]

Problem is, she was getting harder and harder to start(dragging) and now she will not start at all, turns over and then ... nothing. Good batts, dual red tops, turns over and then... nothing.

 

[NotMatt]

Since your rig is OBDII, you should take it to autozone or schucks or some other major auto parts retailer and ask them to put their scan tool on it. They can reset the codes, which is helpful because OBDII stores the codes a lot of times even if the cause has gone away (for example, on the 96 Jetta I was working on a while back, it read a cylinder misfire on every cylinder every time the rig wouldn't start for one reason or another... which got stored and kept the CEL on all the time until I cleared it).

With my scan tool, I reset the codes 1st and then start it up and drive it around and see what codes come BACK after that process (or sometimes the code will pop right back up after you fire it up).

[EDIT]: Damn, too fast for me. Since it's not running, kinda hard to take it to the parts store... I would bet your problem has something to do with the #42 code: An open or shorted condition detected in the auto shutdown relay circuit. An open condition detected in the ASD relay output circuit. An open or shorted condition detected in the fuel pump relay control circuit. An open circuit between PCM and fuel gauge sending unit. Circuit shorted to voltage between PCM and fuel gauge sending unit. No movement of fuel level sender detected.

 

[XtrmTJ]

Seeing how I just installed a new fuel cell, I bet that is the problem. I will take it out of the tank, check it over, reinstall it and see what happens. Can I clear the error codes myself after I do this ?

 

[NotMatt]

Seeing how I just installed a new fuel cell, I bet that is the problem. I will take it out of the tank, check it over, reinstall it and see what happens. Can I clear the error codes myself after I do this ?

Not that I know of. Some codes will clear after a certain number of succesful start/warm-up cycles, not sure if this one will or not. You can get a cheap scan tool that will read the codes and also reset them from Autozone for about 70 bucks (what I paid for mine), as long as your TJ has a generic OBDII diagnostic port (I think it does, but it's worth a look before you go buying something).

 

[XtrmTJ]

Is that that lil female conector under dash, drivers side ?

 

[XtrmTJ]

I also watcked an O2 sensor that is just infront the muffler. Looks like the wires are still conected, but maybe it is damaged also ?

 

[NotMatt]

I also watcked an O2 sensor that is just infront the muffler. Looks like the wires are still conected, but maybe it is damaged also ?

Sounds like it based on the codes. I dont thing that is what is causing your rig not to run though.

 

[GaryTJ]

check the big fuses in the power distribution box. The Injector fuse is also the power for the o2 heater so it might have blown it. Be sure and unplug the o2 before trying to fire it back up.

code 12 and 55 are beginnning and end. Auto shutdown relay code is very common in Jeeps but won't stop it from running. You probably bent the o2 and shorted the heater and blew the fuse.