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Unread 04-17-2013, 09:09 PM   #1
Registered User
1994 ZJ 
Join Date: May 2012
Location: Spring, Texas
Posts: 46
1994 ZJ ECU Help

First I have done everything on the "Dirty Dozen" suggestions forum including changing the three capacitors on the ECU. I have a Grand Cherokee Laredo, 2wd, 4.0L which has had the following replaced. O2, IAC, TPS, MAP sensor. All electoral connections inspected & cleaned. Temp gauge & oil pressure sending unit replaced as well although I don't think they have anything to do with the sudden bucking, and stalling problem.

I did notice if you play with the gas pedal when it tries to stall that it will keep running and not stall. This led me to look a little harder at the TPS (remember it is new). In my poorly written after market manual it has you unplug the TPS and check to see if there is 5v on the two outside connections (ignition must be in the on position). I have 7.3v ? That seemed a we bit high and after turning the ignition switch off I still have 3.2v? Again looking at my poorly written manual I see 12v goes to the ECU and 5v goes to one of the connections on the TPS connector.

Has anyone seen this before? Is this a bad ECU?

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Unread 04-17-2013, 09:13 PM   #2
Registered User
1996 ZJ 
Join Date: Sep 2012
Posts: 148
could be ecu. i had this issue with my 96. went through and changed everything from fuel filter map iac tps coil plugs wires cap and rotor and still acting up... the next day i went and got a PCM(ECU) whatever you want to call it, from my local junk yard. $30 and shes been running great for the last two months.
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