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Old 05-22-2013, 01:27 PM   #1
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Ok I give up!

Ok I give up I just got a 90 4.2L YJ it drove to my house now it won't start piece by piece I get closer but still now back to running. I need a scanner to hook it up, what kind do I need to scan it and get the codes. I know where the plug I just need to know what kind of scanner that works with this - 90 4.2L YJ AX-15 Please Help!!!

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Old 05-22-2013, 01:35 PM   #2
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have you checked the codes on the dash yet?

To extract the diagnostic trouble codes, perform the following steps:
Without starting the engine, turn the ignition key ON, OFF, ON, OFF and ON. The CHECK ENGINE light on the dash will begin to flash.
If any trouble codes are stored in the PCM memory, the CHECK ENGINE light will flash the number of the first digit, pause and flash the number of the second digit. For example, Code 23, air temperature sensor circuit would be indicated by two flashes, pause three flashes. A long pause will appear between individual codes if more than one code is present. Carefully observe the flashes and record the exact code number(s) onto paper.
After the stored codes have been indicated (or if everything in the self diagnosis system is functioning properly), the CHECK ENGINE light will flash a Code 55.
If the ignition key is turned OFF during the code extraction process and possibly turned back ON, the self diagnostic system will automatically invalidate the procedure and must be restarted.

11 No crank reference signal at PCM

12 Battery disconnect

13 No change in MAP from start to run

14 MAP sensor voltage too low or too high

15 No vehicle speed (distance) sensor signal

17 Engine is cold too long (thermostat stuck open)

21 O2S stays at center or O2S shorted to voltage

22 ECT sensor voltage too high or too low (engine coolant temperature sensor is faulty)

23 Intake air temp sensor voltage too low or too high

24 Throttle position sensor voltage too high or too low

25 Idle air control motor circuits

27 Injector control circuit

33 Air conditioning clutch relay circuit

34 Speed control solenoid circuit or switch voltage

41 Generator field not switching properly

42 Auto shutdown relay control circuit

44 Battery temp sensor volts out of limits

46 Charging system voltage too high

47 Charging system voltage too low

51 O2S signal stays below center (lean)

52 O2S signal stays above center (rich)

53 Internal PCM failure or PCM failure SPI communiations

54 No cam sync signal at PCM

55 Completion of diagnostic code display

62 PCM failure SPI miles not stored

63 PCM failure EEPROM write denied

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Old 05-22-2013, 01:45 PM   #3
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I'm pretty sure the only people that can scan codes on -95 are dealers. Atleast I know autozone can only do 95+
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Old 05-22-2013, 03:22 PM   #4
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Quote:
Originally Posted by Ancylus View Post
I'm pretty sure the only people that can scan codes on -95 are dealers. Atleast I know autozone can only do 95+
Follow the instructions Tiger Blood gave you and you will get the codes. The instructions that were given are how you get the codes, there is not any code readers for 95 and older this is why auto zone can't read them for you. Trust the forum people.
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Old 05-22-2013, 03:43 PM   #5
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obd1 cars can be scanned just like obd2 cars can. Pre 1995 just need a different scanner.
obd1 = 1994 and older
obd2 = 1995 plus
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Old 05-23-2013, 05:00 AM   #6
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Thank you very much guys!
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Old 05-24-2013, 03:15 AM   #7
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i have a code 33 on my 93 2.5 but as far as i can tell it never had ac
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Old 05-24-2013, 08:11 AM   #8
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i have a code 33 on my 93 2.5 but as far as i can tell it never had ac
You will always get a 33, even if it never had air. all of the pcm's are programmed the same, as well as the wiring harness has the plug-ins for the AC pump/compressor. So the PCM will always show a fault for AC unless you actually have AC.
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Old 05-25-2013, 10:48 PM   #9
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The 4.2L is pre-OBD. The computer does not store codes, and nobody makes a scanner to read the real-time signals from the computer.

I highly recommend checking out the following site: Adventures Under the Hood

You'll find just about everything you need to troubleshoot the 4.2L setup. The site has info on the diagnostic readers and the data that you can get from them. However, you'll need to use the info on that website to build yourself a diagnostic reader. If you can design simple circuits and solder, you can make yourself a reader. I built one for mine when I had the OEM setup.
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Old 05-26-2013, 01:36 PM   #10
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Originally Posted by NonRubicon View Post
The 4.2L is pre-OBD. The computer does not store codes, and nobody makes a scanner to read the real-time signals from the computer.

I highly recommend checking out the following site: Adventures Under the Hood

You'll find just about everything you need to troubleshoot the 4.2L setup. The site has info on the diagnostic readers and the data that you can get from them. However, you'll need to use the info on that website to build yourself a diagnostic reader. If you can design simple circuits and solder, you can make yourself a reader. I built one for mine when I had the OEM setup.
Yeah I got those skills thanks! His has been a PITA so ill do about anything to solve it.

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