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ECU location and Pin out diagram

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17K views 5 replies 4 participants last post by  jenowman  
J
#1 · (Edited)
ECU/ECM location

I didn't realize this was such a tough question, since this post has gone un- answered for over a week, so I'll try again

I looking for the location of the ECU/ECM for this vehicle and if possible a Pin out diagram of the ECU/ECM

Specifically, I need to tap into the odometer feed on the ECU/ECM to hook up a Terratrip odometer.

Vehicle: 2002 Grand Cherokee Laredo automatic.

Thxs
 
#4 ·
The PCM is on the firewall, passenger side, behind the coolant overflow reservoir. The reservoir has to be removed in order to gain access to the connectors. The three connectors are large and they are black, white , and gray.

The pin out diagrams do not show an odometer wire. I am fairly confident that odometer information is generated by the BCM (body control module) and sent over the PCI bus to the odometer.

I don't think Chrysler makes it very easy to gain access to the odometer feed, as you might expect.
 
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