Electronics bugging out!
Thread Starter
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Mountain Pass
Joined: Jul 2017
Posts: 103
Likes: 0
Electronics bugging out!
After installing ball joints in some cold, wet conditions, I'm having consistantly erratic electronic issues. I'm getting a ton of codes depending what test I run:
P0472 (exhaust pressure sensor)
P0344 (CPS sensor)
P0340 (CPS sensor intermittent; had this pop up before but never an issue)
when buzz test (buzz audible on all 8 cylinders):
P1668 (IDM recently replaced; just checked connector no water or corrosion)
P0196 (OIT sensor)
Self-test yields:
P0476 (exhaust pressure)
I have a digital RPM readout that's consistently glitching and when the PCM wants to shift its indecisive although cruises OK after shifting.
I also can't start the vehicle with the starter battery alone (I have a setup where I have one AGM battery which usually starts the engine if it's not freezing, then hit a switch where I get a boost from the deep cycles. Both banks independently grounded and connected to the starter). What's off is it just clicks without voltage drop on the starter battery. Could be unrelated, but maybe a bad ground?
If this persists I'll have to hook up the fore scan EKG and maybe see what sensors are acting wacky.
Any suggestions appreciated!
P0472 (exhaust pressure sensor)
P0344 (CPS sensor)
P0340 (CPS sensor intermittent; had this pop up before but never an issue)
when buzz test (buzz audible on all 8 cylinders):
P1668 (IDM recently replaced; just checked connector no water or corrosion)
P0196 (OIT sensor)
Self-test yields:
P0476 (exhaust pressure)
I have a digital RPM readout that's consistently glitching and when the PCM wants to shift its indecisive although cruises OK after shifting.
I also can't start the vehicle with the starter battery alone (I have a setup where I have one AGM battery which usually starts the engine if it's not freezing, then hit a switch where I get a boost from the deep cycles. Both banks independently grounded and connected to the starter). What's off is it just clicks without voltage drop on the starter battery. Could be unrelated, but maybe a bad ground?
If this persists I'll have to hook up the fore scan EKG and maybe see what sensors are acting wacky.
Any suggestions appreciated!
Fleet Mechanic
Joined: Nov 2006
Posts: 1,664
Likes: 219
From: Northwest
From an electrical stand point....... What did you alter while installing the ball joints ?? Could one of your tools hit one of the electrical connectors ? Did you disconnect the batteries while working on the ball joints ?
I'd start out by disconnecting the batteries, let it sit a few minutes and then reconnect the batteries. Similar to rebooting a computer.
Hobo
10 degrees here in Montana with wind from the north and snow kneed deep.... A day for big girl panties.
I'd start out by disconnecting the batteries, let it sit a few minutes and then reconnect the batteries. Similar to rebooting a computer.
Hobo
10 degrees here in Montana with wind from the north and snow kneed deep.... A day for big girl panties.
Thread Starter
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Mountain Pass
Joined: Jul 2017
Posts: 103
Likes: 0
Plot thickens: I checked ohms between chassis engine and starter batt, seem OK (I know this doesn't mean it's good) so I then check volts between batt+ and frame which is good, but then I try to start the engine it drops to zero with the 'click' sound! Checking batt terminal+ with terminal- the voltage does not drop.
Fleet Mechanic
Joined: Nov 2006
Posts: 1,664
Likes: 219
From: Northwest
Being it's cold and damp.......... Put a battery charger on the battery and get it fully charged. Then just turn the key to start and hold it there (or have someone hold it there)....
Start looking for steam / smoke coming from something electrical under the hood.... Where there is resistance there should be heat / steam.
Hobo
Start looking for steam / smoke coming from something electrical under the hood.... Where there is resistance there should be heat / steam.
Hobo
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Thread Starter
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Mountain Pass
Joined: Jul 2017
Posts: 103
Likes: 0
I'm greasy and cold but I think I fixed it. As we all suspected, I had a bad ground.
Only weird thing that happened driving about a mile was the oil pressure went from half gauge to 1/4 gauge at a stop light then back to half. Plenty of oil in the engine.
Anyway thanks for the moral support!
Only weird thing that happened driving about a mile was the oil pressure went from half gauge to 1/4 gauge at a stop light then back to half. Plenty of oil in the engine.
Anyway thanks for the moral support!
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From: Bahstun
oil gauge works from a switch, maybe needle just jumped and dont worry, you cant hurt it running out of oil unless coasting down a long hill and run bone dry
the truck is old, grounds get rusty, go clean them all when you can. Made a huge difference on mine when i got it.
there are ones at kick panels in the cab the get missed
the truck is old, grounds get rusty, go clean them all when you can. Made a huge difference on mine when i got it.
there are ones at kick panels in the cab the get missed
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