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Old 03-22-2014, 03:24 AM
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What is the best reader for this model?

There are a lot of machines that seem to be able to interface with the built in computer's in these vehicles. But I'm not sure if they work for 1995 models. I know there is some sort of computer in the 1995 YJs but I'm not sure how rudimentary it is and what my options are for interface.

I guess part of it is that I want to know what "check engine" means. I already know in my own case, there is a sensor in the engine I've had changed 3 times and every time I get it changed the check engine light goes away for two weeks and then comes right back. So either the mechanic wasn't fixing the issue or the sensor is just defective.

In any case, I'd like to actually get a full read out from the engine at will. What is more, there are some of these units that seem to be able to change engine timings or fuel mixtures which sounds pretty neat. However, I assume that isn't going to happen with a 95 yj.

Anyway... just curious as to my options.
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Old 03-22-2014, 03:27 AM   #2
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key on key off key on key off key on count the flashes!!!!

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Old 03-22-2014, 03:41 AM
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So... I really need to buy a manual or a repair book or something, huh?
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Old 03-22-2014, 07:54 AM   #4
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Either buy a book or a subscription to Alldatadiy.com. There's a lot of info you'll need anyway. You have an OBD 1 vehicle. You can't make any changes by plugging in a tuner, if any changes can be made a new chip needs to be burned for the ECU. So pretty much the tune you have is all you got.
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Old 03-22-2014, 10:34 AM   #5
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There is a way to check the codes by turning the ignition on and off and counting the flashes. Here is a thread I copied awhile back:

Self-Diagnostic Codes: Retrieval and Mysterious Meaning

Applies to years 91 and newer YJ

The best way to tell if your Jeep is storing a code is if the "CHECK ENGINE" light comes on. (Or "POWER LOSS" as some Haynes manuals for YJs will state.)

Your Jeep.
Your Jeep's Keys.
A pen/pencil (to record codes with).
Paper (to record codes).

To retrieve codes (even if the light isn't on but you think something is wrong) simply:

1) Set the parking brake and put your transmission in NEUTRAL (MANUAL) or PARK (AUTOMATIC).

2) *According to Haynes Maual*: Run the engine to 2,500RPMs in the appropriate above gear. Cycle the A/C (if you still have one) briefly, then turn it off. [Automatic Only] With your foot on the brake, shift into each gear position until you reach L (Low/First) then begin shifting back until you reach park.

3) Now on to actually retrieving your codes. Turn your ignition key to "ON", "OFF", "ON", "OFF", and back to "ON" and leave it there.

4) Watch the ENGINE LIGHT (or POWER LOSS light). It will blink to indicate numbers. It will 'blink to indicate the first number of the digit then pause and blink to indicate the second digit of the number'.

4 Example) 23 MAT Sensor Circuit: Check engine light would blink twice for the 2, then pause (About 2 seconds) and blink 3 times for the 3. Put the two together and you have 23.

NOTE: The pause between DIGITS OF A CODE is Approximately 2 seconds.

NOTE: The pause between CODES is Approximately 4-5 seconds. (IF Multiple Codes are being reported)

NOTE: When you receive CODE 55 it means the Diagnosis is done. No more codes will be generated until you restart the process.

Haynes Note: "Certain Criteria must be met for a fault code to be entered into the computer memory. The criteria may be a specific range of engine RPM, engine temp. or input voltage to the computer. It is possible a fault code will not be entered into memory despite a malfunction".

SELF-DIAGNOSTIC CODES (1991 and later models):
CODE: Probable Cause:

11 Ignition

13 Manifold Absolute Pressure (MAP) Sensor Vacuum

14 Manifold Absolute Pressure (MAP) Sensor Electrical

15 Distance Sensor or Circuit

17 Engine Running Too Cool

21 Oxygen Sensor or Circuit

22 Coolant Temperature Sensor or Circuit

23 MAT Sensor or Circuit

24 Throttle Position Sensor (TPS) sensor or Circuit

25 Automatic Idle Speed (AIS) Circuit

27 Fuel Injector Control

33 Air Conditioning Clutch Relay

41 Alternator Field

42 Automatic Shutdown Relay

44 Battery Temperature Sensor

46 Battery Over Voltage

47 Battery Under Voltage

51 Oxygen Sensor - lean condition indicated

52 Oxygen Sensor - rich condition indicated

53 Internal Engine Controller Fault

54 Distributor Sync Pickup

55 End of Code Output

62 Emissions Maintenance Reminder (EMR) mileage accumulator

63 Controller Failure EEPROM write denied

*Mostly Thanks To The Haynes Manual*

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