OBD1 and OBD2 - JeepForum.com
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post #1 of 31 Old 11-01-2005, 05:02 PM Thread Starter
FDSJr
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OBD1 and OBD2

I have a 94 Grand Cherokee Limited (5.2 L V8), a 96 Cherokee Classic (4.0 L 6), and a 98 Grand Cherokee 5.9 Limited (5.9 L V8). I am getting a little tired of paying dealers to read fault codes and then charge me large amounts of money to fix the problem. I am considering getting my own OBD code reader. I am guessing that my 94 is OBD1 and the 96 and 98 are OBD2.
Does anyone know if an OBD2 code reader will also read OBD1 codes (with the right adapter cable for the connector)?

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post #2 of 31 Old 11-01-2005, 05:25 PM
JCDubya
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OT: I wonder if OBDII ZJ's can be converted to OBDI. I did that in my Integra...
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post #3 of 31 Old 11-01-2005, 05:53 PM
-Joe-
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Why cant you just use the check engine and key on/off 3x cycle to grab the codes?

I recall trying this in a friends 2001 and it worked as well. (I know it works on 94-95s as well)

- Joe -

'95 Jeep Grand Cherokee Laredo I6 4.0L
242TC - Extreme Engineering 2" Front Lift/1.75" Rear Lift - ES9000 Shocks + JKS BPEs
Moog Cargo Control Springs
Magnaflow Converter - Dynomax Muffler
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post #4 of 31 Old 11-01-2005, 06:57 PM
Woody
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I know you can use the 3 cycles thing up until 04 on GC. Next time I'm at a dealer, I'll try it with a WK.

Woody
1985 1 ton K-5, Detroit diesel, 36" tires (going bigger when money permits), 4-speed manual swap, Rockwell T-case, Hybrid lift, 12.5K winch.
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post #5 of 31 Old 11-01-2005, 07:28 PM
greasefingers
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There is nothing that I know of that can support both OBDI & OBDII. If there is then it will cost several hundred. You can get nice one that connect to your PC from $ 100 to $ 300. IMO it would not be worth it to buy an OBDI scanner for our jeep.

I tried the key-cycle thing on a 1999 Cherokee. It did not work. But it works on mine

Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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post #6 of 31 Old 11-01-2005, 07:29 PM
Woody
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Quote:
Originally Posted by greasefingers
I tried the key-cycle thing on a 1999 Cherokee. It did not work. But it works on mine
Maybe you had a fluke, it worked on my 99 and the neighbors 04.

Woody
1985 1 ton K-5, Detroit diesel, 36" tires (going bigger when money permits), 4-speed manual swap, Rockwell T-case, Hybrid lift, 12.5K winch.
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post #7 of 31 Old 11-01-2005, 07:32 PM
greasefingers
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Quote:
Originally Posted by Airmanwoody
Maybe you had a fluke, it worked on my 99 and the neighbors 04.
This was a 99 cherokee and not a grand.

Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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post #8 of 31 Old 11-01-2005, 07:34 PM
Woody
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Most curious, makes me want to put on the Sherlock Holmes hat.

Woody
1985 1 ton K-5, Detroit diesel, 36" tires (going bigger when money permits), 4-speed manual swap, Rockwell T-case, Hybrid lift, 12.5K winch.
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post #9 of 31 Old 11-01-2005, 07:40 PM
greasefingers
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1996 & 1999 were very strange years for jeeps.

Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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post #10 of 31 Old 11-01-2005, 07:42 PM
Woody
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I think they hired rejects or prison innmates those two years.

Woody
1985 1 ton K-5, Detroit diesel, 36" tires (going bigger when money permits), 4-speed manual swap, Rockwell T-case, Hybrid lift, 12.5K winch.
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post #11 of 31 Old 11-01-2005, 07:46 PM Thread Starter
FDSJr
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I'll give the key on-off cycling thing a try. I had a 96 Dodge Neon awhile back that that trick worked on. It is a lot cheaper than a code reader.
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post #12 of 31 Old 11-01-2005, 07:48 PM
Woody
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We try to save folks money, sometimes we can, and sometimes we are the bearer of bad news. I'm glad we can save you some though.

Woody
1985 1 ton K-5, Detroit diesel, 36" tires (going bigger when money permits), 4-speed manual swap, Rockwell T-case, Hybrid lift, 12.5K winch.
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post #13 of 31 Old 11-01-2005, 07:50 PM
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Im also pretty sure the 99 limited my friend bought after she totaled the 01 it worked on as well.

- Joe -

'95 Jeep Grand Cherokee Laredo I6 4.0L
242TC - Extreme Engineering 2" Front Lift/1.75" Rear Lift - ES9000 Shocks + JKS BPEs
Moog Cargo Control Springs
Magnaflow Converter - Dynomax Muffler
235/75/15 AT Uniroyal Liberator Tires
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post #14 of 31 Old 11-01-2005, 10:02 PM
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My 94 OBDI works with the key cycles.

I tried the key cycle in my Dad's 97 XJ, his displayed the codes in both ways... the 'P' xxxxx codes (digital odometer) and the blinking CE light. (97+ XJ's had the digital odometer) this where the P codes are displayed on the WJ too. Not sure if this helps or just adds to the confusion!
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post #15 of 31 Old 06-04-2013, 09:57 PM
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Quote:
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Reliability is relative
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