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Unread 05-01-2013, 10:45 PM   #1
Jramos43
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1996 ZJ 
 
Join Date: Feb 2013
Location: El Paso, Texas
Posts: 79
Just bought a 96 5.2 ZJ PLEASE HELP !!!!

I just bought it and now the check engine light is on. Took it to auto zone and they gave me a paper saying :
No change in map sensor voltage from koeo to koer

Detected no change in MAP sensor voltage.
Failed map sensor
Shorted signal wire
ECM Defective


Now I am new to ZJ 's so please help me out as to how i fix this please. Thank you

99 WJ

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Unread 05-01-2013, 11:08 PM   #2
JohnCrabtree
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1994 ZJ 
 
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Location: Sonora, California
Posts: 314
Quote:
Originally Posted by Jramos43 View Post
I just bought it and now the check engine light is on. Took it to auto zone and they gave me a paper saying :
No change in map sensor voltage from koeo to koer

Detected no change in MAP sensor voltage.
Failed map sensor
Shorted signal wire
ECM Defective


Now I am new to ZJ 's so please help me out as to how i fix this please. Thank you

99 WJ
1999 Grand Cherokees are WJs (as you correctly said at the end of your post) not ZJs. This subforum might be a bit more help.
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Unread 05-01-2013, 11:14 PM   #3
Jramos43
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Location: El Paso, Texas
Posts: 79
I know, I used to own a WJ and I forgot to take off my signature

99 WJ
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Unread 05-01-2013, 11:18 PM   #4
JohnCrabtree
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Quote:
Originally Posted by Jramos43 View Post
I know, I used to own a WJ and I forgot to take off my signature

99 WJ
Ah, okay. Well, I'll let more experienced guys chip in here as I have no idea how MAP sensors actually work (I've never even pulled mine off and looked at it). Although this gives me an idea for what to do while I clean my throttle body.
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Unread 05-02-2013, 12:57 AM   #5
Jramos43
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1996 ZJ 
 
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Location: El Paso, Texas
Posts: 79
Thanks. Glad I could help

99 WJ
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Unread 05-02-2013, 08:20 AM   #6
ratmonkey
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1997 ZJ 
 
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Location: , Pennsylvania
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It's a diaphragm that gets moved by manifold vacuum.

Either the orifice is obstructed, the sensor is bad, or possibly wiring.
Use the "key trick" and post the code from your odometer so know exactly what the pcm is seeing.
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'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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Unread 05-02-2013, 07:08 PM   #7
Jramos43
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Location: El Paso, Texas
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I got codes 12 13 77 55

96 ZJ
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Unread 05-02-2013, 07:55 PM   #8
dusterdude
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1996 ZJ 
 
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Can i assume the jeep is running crappy?
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Unread 05-02-2013, 09:12 PM   #9
AnotherRedZj
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1997 ZJ 
 
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Location: fort walton beach, fl
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Quote:
Originally Posted by Jramos43 View Post
I got codes 12 13 77 55

96 ZJ
12 means there's a problem found
13 is MAP sensor
77 is speed control relay
55 means end of codes
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5.2 crate - fourwheelcustoms 2.25 BB - 31x10.50 BFG at-ko's 249/242 swap - front drive shaft upgrade by driveshaftspecialistincorporated - jcr off-road front bumper - engo 12k lbs winch......
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Unread 05-02-2013, 09:56 PM   #10
Jramos43
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dusterdude: no the jeep runs fine. And strong

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Unread 05-02-2013, 09:57 PM   #11
Jramos43
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bmeyst : alright thanks.

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