2004 Grand Cherokee Cluster Drop Out

Glenn Owner/Technician New Sharon, Maine Posted   Latest  
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2004 Jeep Grand Cherokee Laredo 4.0L (S) 4-spd (42RE)

This Jeep is one that has me stumped. Losing pci bus to cluster. Unplugged all modules on the line except pcm and cluster and cluster would drop out. I cut the pci wire at pcm and ran a new wire to cluster eliminating pci bus wire. Still dropped out. I did have my scope on the wire it would drop to 3-5 volts. I don't have the screen capture. Changed the pcm 1st used 2nd reman 3rd reman me result. Now I am assuming cluster has to be dropping out. Replaced cluster with used and same result drops out. Checked powers and grounds to both and were good. Any ideas would be appreciated. Thank you.

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Roddy Technician
Mississauga, Ontario
Roddy Default
 

Had a few issues on Chrysler vehicles that had some green corrosion under the fuse box on one of the wires. It looks in tact but basically hanging together by a few strands so when loaded it fails to allow amperage to pass through but will read 12v when tested.

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Glenn Owner/Technician
New Sharon, Maine
Glenn Default
 

Fuse and wire are good. Thanks for the info.

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Rudy Technician
Montebello, California
Rudy Default
 

Sounds like the culprit is wiring. Did you load test the circuit? How? With what type of load?

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Glenn Owner/Technician
New Sharon, Maine
Glenn Default
 

I did test the circuit with incandescent test light with the cluster out.

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Dave Owner/Technician
Greenbrier, Arkansas
Dave Default
 

Disconnect the flash enable on pin 8 on the cluster and see what happens.

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Glenn Owner/Technician
New Sharon, Maine
Glenn Default
 

I will try that thank you.

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Brian Owner
Parma, Ohio
Brian Default
 

I have had a few problems with data lines on this vintage jeep causing either a no start of intermittent drop outs. The large connector in the passenger compartment pass side, behind, under fuse box was internally shorting to other circuits causing many issues. diag​.​net/file/f2bba84ag… it is listed at c106 however info is hard to find sometimes!

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