PCM question
Logistics Pro
Joined: Mar 2002
Posts: 3,881
Likes: 84
From: Wake Forest, NC
Slim to none, you need to check for power, but I honestly can't tell you EXACTLY where to start because every year seems to be different. If I was looking at the truck and the diagrams I could but...
Let's back up then.
How do you know it's building oil pressure?
The tach may or may not move on the diesel, I know on my truck it doesn't but mine is driven off the data bus. I would assume the 01 is similar.
Several things run off the PCM power relay. It comes from 30 amp fuse 24 at the battery junction box (BJB). The easiest to check is the GP relay, it should get 12 volts power to one of the smaller terminals when the key is on (actually both if it's not activated). If this isn't happening, you most likely are not getting PCM power.
The PCM relay is fed through a diode from the ignition switch through 30 amp fuse 30 in the Central Junction box (CJB).
Let's back up then.
How do you know it's building oil pressure?
The tach may or may not move on the diesel, I know on my truck it doesn't but mine is driven off the data bus. I would assume the 01 is similar.
Several things run off the PCM power relay. It comes from 30 amp fuse 24 at the battery junction box (BJB). The easiest to check is the GP relay, it should get 12 volts power to one of the smaller terminals when the key is on (actually both if it's not activated). If this isn't happening, you most likely are not getting PCM power.
The PCM relay is fed through a diode from the ignition switch through 30 amp fuse 30 in the Central Junction box (CJB).
Thread Starter
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Elder User
Joined: Feb 2008
Posts: 568
Likes: 0
From: Irwin,Pa
The oil pressure gauge on the the panel works & build up pressure
I was just doing a little testing.. The PCM Diode in the BJB has power.. not sure where to go from there though...
Not to sound stupid, but i'm relatively new to the diesels.. Where is the GPR.. If I recall, is somewhere on the passengers side.. but i have never really looked for it..
I was just doing a little testing.. The PCM Diode in the BJB has power.. not sure where to go from there though...
Not to sound stupid, but i'm relatively new to the diesels.. Where is the GPR.. If I recall, is somewhere on the passengers side.. but i have never really looked for it..
Slim to none, you need to check for power, but I honestly can't tell you EXACTLY where to start because every year seems to be different. If I was looking at the truck and the diagrams I could but...
Let's back up then.
How do you know it's building oil pressure?
The tach may or may not move on the diesel, I know on my truck it doesn't but mine is driven off the data bus. I would assume the 01 is similar.
Several things run off the PCM power relay. It comes from 30 amp fuse 24 at the battery junction box (BJB). The easiest to check is the GP relay, it should get 12 volts power to one of the smaller terminals when the key is on (actually both if it's not activated). If this isn't happening, you most likely are not getting PCM power.
The PCM relay is fed through a diode from the ignition switch through 30 amp fuse 30 in the Central Junction box (CJB).
Let's back up then.
How do you know it's building oil pressure?
The tach may or may not move on the diesel, I know on my truck it doesn't but mine is driven off the data bus. I would assume the 01 is similar.
Several things run off the PCM power relay. It comes from 30 amp fuse 24 at the battery junction box (BJB). The easiest to check is the GP relay, it should get 12 volts power to one of the smaller terminals when the key is on (actually both if it's not activated). If this isn't happening, you most likely are not getting PCM power.
The PCM relay is fed through a diode from the ignition switch through 30 amp fuse 30 in the Central Junction box (CJB).
Logistics Pro
Joined: Mar 2002
Posts: 3,881
Likes: 84
From: Wake Forest, NC
I think it might be the HEIC, I'm going to go double check right now, but I'm 99% it doesn't. I usually notice it jump up once the truck starts.
Thread Starter
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Elder User
Joined: Feb 2008
Posts: 568
Likes: 0
From: Irwin,Pa
after checking further.. fuses #19 & 24 in the BJB are dead.. key on & key off
after testing the PCM power relay..using a diagram F350-6 sent me last nite.. if i put the black probe of my volt meter in pole # 85 (ground) the red in pole # 30 (battery pwer) I get 12 volts.. pole # 86 (voltage, ignition sitch in run/start.. *overlaod protected electronic module*) I get NO reading pole # 87 (fused feed) i get .84 volts ..
after testing the PCM power relay..using a diagram F350-6 sent me last nite.. if i put the black probe of my volt meter in pole # 85 (ground) the red in pole # 30 (battery pwer) I get 12 volts.. pole # 86 (voltage, ignition sitch in run/start.. *overlaod protected electronic module*) I get NO reading pole # 87 (fused feed) i get .84 volts ..
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
. Sorry Gregg.
Thread Starter
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Elder User
Joined: Feb 2008
Posts: 568
Likes: 0
From: Irwin,Pa
Thats ok.. Anybody want an all expense paid trip to beautiful SW Pa.. its sunny & 49 outside today & only going to 36 tonite... the soothing sounds of the Pa Turnpike can be heard while working on my truck.. oh, did I mention free beer???
Lead Driver
Joined: Jan 2007
Posts: 6,708
Likes: 5
From: Kiowa CO
The oil pressure gauge on the the panel works & build up pressure
I was just doing a little testing.. The PCM Diode in the BJB has power.. not sure where to go from there though...
Not to sound stupid, but i'm relatively new to the diesels.. Where is the GPR.. If I recall, is somewhere on the passengers side.. but i have never really looked for it..
I was just doing a little testing.. The PCM Diode in the BJB has power.. not sure where to go from there though...
Not to sound stupid, but i'm relatively new to the diesels.. Where is the GPR.. If I recall, is somewhere on the passengers side.. but i have never really looked for it..
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