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Unread 01-15-2014, 01:54 PM   #1
ConnorZJ413
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1998 ZJ 
 
Join Date: May 2013
Location: Wareham, Mass
Posts: 18
O2 sensor shorted out PCM?

I posted earlier on this issue but have broken a little ground. My driveshaft ripped my downstream o2 sensor wires out of the exhaust plug, which resulted in them dragging on the wet ground this morning. My asd relay is good and the o2 harness has suffered a little damage but not much. When I turn it on she crank and cranks with all lights working, dashboard/overhead, but none o my guages work at all, they all sit at 0. Could the wet ground shorted my PCM? Or worse?

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Unread 01-15-2014, 04:01 PM   #2
Gearhead31
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1995 ZJ 
 
Join Date: Feb 2012
Location: St Pete, Florida
Posts: 1,848
deleted. Bad info
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1995 ZJ ltd, 4.0 i6, *cough stock cough* 253,xxx and still pumping strong
1998 Chevy Cheyenne K1500, 5.7L Vortec, mostly stock
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Unread 01-15-2014, 10:04 PM   #3
JS97ZJ
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1997 ZJ 
 
Join Date: Dec 2009
Location: Dingmans Ferry, PA
Posts: 2,015
#20 fuse in the PDC (under the hood fuse box) is probably blown. Make sure the wires are separated before replacing it.
You can drive it without the downstream o2 but it will register a fault code and affect the gas mileage a little.
The downstream mainly monitors the health of the cat.
If the fuse blows again after the you've done the above, your PCM has probably gone bad.
pdc.png

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Unread 01-16-2014, 11:09 AM   #4
ConnorZJ413
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1998 ZJ 
 
Join Date: May 2013
Location: Wareham, Mass
Posts: 18
Yes I checked all fuses and relays. Great info though!!!
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