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Oliverian Automotive LLC
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We are Driven to Serve You
We are Driven to Serve You

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2008 #chevrolet 2500 van with a 4.8 came in for a charging system fault .The battery light was on and the guage showed that the vehicle was not charging. The van had already received a new battery and alternator weeks prior before coming to us. There wasn't any check engine light on but the only message was service charging system that was on in the cluster. Using my scan tool and meter we were able to verify that it was in fact charging and we voltage dropped the cables anyways to be certain. The #pcm sends out a five volt signal to the alternator on the orange wire called the generator turn on signal and the pcm monitors the grey wire (see schematic) generator field duty cycle signal these components were working as they should but the cluster shows no charging and the battery light is on the cluster is fed this info through the gm class 2 so if it was a class 2 problem more than one gauge would be out. I need to pull up the service info on this system and get the scan tool out and pull up some data the first thing i noticed was no codes stored in the pcm but several codes in the bcm also the pcm and the bcm shows charging voltage but the bcm is not liking what it sees. After reading about the charging system which btw the wiring diagrams is kinda misleading because theres alot more to the system than what it shows. Testing the power and grounds at the bcm was my next step after reading the codes and what they mean compared to the service information and we found the answers we were looking for while the vehicle is running and loads turned on voltage dropped the powers and grounds on the ground wire and two power wires where i found the issue on pin 3 where I should see battery voltage we see only a trace of it.I traced the problem back to a corroded wire under the fuse box that was touching metal I repaired the wire and replaced the fuse and we were back operational again.
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12/20/17
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2014 Ford F350 with a 6.7 codes stored P20BD and P20BE with heater reductant performance issues. I just wanted to try and diagnose this differently not saying its right or wrong. If I am dropping this tank I only want to do it once. I wanted to see if I could do it with just the scan tool using ohms law I used the pico just for added insurance and the more we do this way hopefully will only need the scan tool. Looking up the code definition and what the glow plug control module is looking for we were able to determine that heater spec is 3 to 5 ohms and 2 to 4.2 amps of current flow. Bidirectionally controlling the heater and using ohms law we were able to determine the heater assembly was bad as ours was pulling 6.689 amps at 13.43 volts giving us 1.98ohms of resistance. The gpcm was shutting the test down within seconds due to the current draw. I think this is quick test instead of dropping the tank and getting to the top of the pump. #FORD #F350
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12/20/17
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Free oil and filter changes on your vehicle 3 times a year, customizable to your vehicle's needs. For the lifetime of your vehicle.
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Going old school today... still a great scope
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A sighting of Shaun Fogarty in his element 6.4 powerstroke turbo assembly replacement...seized turbo #turbo
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10/24/17
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