yxmj Posted November 30, 2015 Posted November 30, 2015 One try before we go to mechanical... 1996 XJ 4.0.....Oil gauge works fine....Son does an oil change....comes inside and says his gauge is pegged to the max....quick inspection shows that when changing the filter he broke the sender in half....after searching had to go to a dealer to buy a new one.....installed....gauge stays pegged.....have +/- 8 volts coming out of gauge.... Stays maxed under all conditions...unplugged...plugged.....grounded... Anyone ever see this ... :hmm:
tugalo Posted November 30, 2015 Posted November 30, 2015 sounds like the wiring to the sender is pinched and shorted out.........
yxmj Posted November 30, 2015 Author Posted November 30, 2015 sounds like the wiring to the sender is pinched and shorted out........ A good point....so then a quick check on that would be just to remove the positive battery cable....with no voltage the gauge should set back down to 0....
HOrnbrod Posted November 30, 2015 Posted November 30, 2015 IGN key to ON. Disconnect the sender wire and the gauge should go HI. If not, Touch the sender wire to ground and the the gauge should go to LO. If it does, the sender is bad. If it doesn't, there is an open in the wiring from the sender to the gauge.
yxmj Posted November 30, 2015 Author Posted November 30, 2015 IGN key to ON. Disconnect the sender wire and the gauge should go HI. If not, Touch the sender wire to ground and the the gauge should go to LO. If it does, the sender is bad. If it doesn't, there is an open in the wiring from the sender to the gauge. Appreciate the answer....I will re-state.... Gauge is ALWAYS on High...Maxed out....under these circumstances.. key off key on sender plugged in key on/off sender unplugged key on/off wire from gauge grounded key on/off Gauge was working good up to oil change.....Sender is brand new OE
HOrnbrod Posted November 30, 2015 Posted November 30, 2015 Missed the wire grounded part. :doh: Was the gauge sitting at 0 before the first start after the oil change, then peg when started?
yxmj Posted November 30, 2015 Author Posted November 30, 2015 That I can not give an accurate answer to. All I can say is it was working fine prior.
yxmj Posted November 30, 2015 Author Posted November 30, 2015 Missed the wire grounded part. :doh: Was the gauge sitting at 0 before the first start after the oil change, then peg when started? Am I thinking the right way? if the gauge is not toasted.....when I remove the positive cable from the battery it should drop to 0...? is 0 the no power default on an OE gauge?
HOrnbrod Posted November 30, 2015 Posted November 30, 2015 For my 91- should be the same as a 96 IGN OFF: Oil pressure gauge is about midscale IGN ON: Oil pressure gauge drops to zero Sounds like the meter movement is shot in your OP gauge.
yxmj Posted November 30, 2015 Author Posted November 30, 2015 Thanks Guys one last shot at chasing that wire then Mechanical it is... . :MJ 1: .
yxmj Posted December 1, 2015 Author Posted December 1, 2015 One last question...... Does the oil sender not send a signal to my jeeps brain box as well? If i replace the sender with the coupler for the mechanical gauge, will we not get a check engine light because the computer will see no oil pressure? Or is the low oil sensor a separate circuit?
HOrnbrod Posted December 1, 2015 Posted December 1, 2015 The OBD1 computer doesn't have an oil pressure input, but the 96 OBD2 does. So you will probably get a fault code w/o the sender hooked up. If converting to a mechanical gauge, you can use a "T" fitting and keep the OEM oil pressure sender and wire connected.
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