help check engine light
#16
CF Veteran
The only diagnostic tool available for an '87-90 XJ is a DRB II scan tool with a Jeep adapter, which simply checks for current return from sensors and actuates the IAC motor. It can be used to adjust the idle in this manner. These plug into the D-pins near the relays on the passenger side of the engine bay, usually covered by yellow rubber caps.
Last edited by alpine.adrenaline; 10-11-2010 at 06:39 PM.
#17
CF Veteran
Join Date: Mar 2010
Location: Broward County Fl.
Posts: 47,923
Likes: 0
Received 29 Likes
on
28 Posts
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
why is there diag conn by relays by prtessure bottle they are the yellow conn in pic
Last edited by freegdr; 10-11-2010 at 06:41 PM.
#18
CF Veteran
#20
CF Veteran
Bingo.
Alternatively you can adjust the IAC motor by plugging 12 volts into the larger diagnostic connector. The socket in the middle closest to you will retract the pintle, the one just above it will advance it. If you get it wrong you can fry some things though, so be careful doing this.
I think Snap-On makes an adapter as well, and I've heard 5-90 on here is reverse-engineering a scanner to work with those connectors.
Alternatively you can adjust the IAC motor by plugging 12 volts into the larger diagnostic connector. The socket in the middle closest to you will retract the pintle, the one just above it will advance it. If you get it wrong you can fry some things though, so be careful doing this.
I think Snap-On makes an adapter as well, and I've heard 5-90 on here is reverse-engineering a scanner to work with those connectors.
Last edited by alpine.adrenaline; 10-11-2010 at 06:47 PM.
#22
Newbie
Thread Starter
Join Date: May 2010
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1990
Model: Cherokee
Engine: V6
ty all for helping me . think i found the problem its the CPS crankshaft position sensor . i just have to figure out how to get it out and what tool to use
bcingu
bcingu
#23
CF Veteran
Join Date: Mar 2010
Location: Broward County Fl.
Posts: 47,923
Likes: 0
Received 29 Likes
on
28 Posts
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
the cps ha snothing to do with the check engine light you dont have one you never did just like mt truck you are going to waist money do you have these connectors under you hood by the batteryif so you do not have a provision for a check engine light go to the chrylser dealer ship and le them loo it up
#25
Newbie
Thread Starter
Join Date: May 2010
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1990
Model: Cherokee
Engine: V6
oh i read the posts thank you , i already bought the CPS i had to mine was frayed and it wont stay started it dies when i drive it now . it says that it tells the computer what to do so i think it will help . i just dont know how to get it out or what tool to use its so far down and close to the back not alot of room to get a tool down there .
#26
CF Veteran
Join Date: Mar 2010
Location: Broward County Fl.
Posts: 47,923
Likes: 0
Received 29 Likes
on
28 Posts
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
jack up truck support with jack stands go from underneath its either 10 mmor 11mm i think need long extensions a couple of them
#29
CF Veteran
Join Date: Mar 2010
Location: Broward County Fl.
Posts: 47,923
Likes: 0
Received 29 Likes
on
28 Posts
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
from the book v6s do have a check engine light his profile says v6 but this post says 6cy you jump these two terminals to activate codes we all learned some thing today
#30
CF Veteran
Join Date: Mar 2010
Location: Broward County Fl.
Posts: 47,923
Likes: 0
Received 29 Likes
on
28 Posts
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
so look for the check engine light on the information center on left of steerin wheel and change bulb if you have a v6