*FIXED*P0603, P0344. New CPS, still getting intermittent coughing/hiccuping/skipping.
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Joined: Mar 2005
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From: Hoschton,GA
As promised, here are the pictures of the problem I had. At this point in time I had already fixed the problem, but the pictures and the fix should be good enough to help out others.
First a picture for orientation of the engine bay.
And now a close-up of the fix. The wire bundle that goes under the intake into that big connector on the drivers side valve cover has a sharp bend in it. If people do not have this sharp bend, then I doubt they will ever have the problem I experienced. It's still good to check though.
I couldn't get electrical tape around the exact chaffed wire (the chafe was very VERY small), so after removing the old tape, I put some di-electric grease on the bundle for waterproofing, wrapped the whole bundle in electrical tape and then put two zip ties on each end of the tape to hold it in place and reinforce the bundle.
I removed the problem screw all together and am keeping it just in case. However, it was just one of two screws holding the intake onto a bracket mounted on the engine, so I doubt it will be missed.
DP-Tuner, be advised that I do not have a chip. This was confirmed by removal and inspection of the PCM.
First a picture for orientation of the engine bay.
And now a close-up of the fix. The wire bundle that goes under the intake into that big connector on the drivers side valve cover has a sharp bend in it. If people do not have this sharp bend, then I doubt they will ever have the problem I experienced. It's still good to check though.
I couldn't get electrical tape around the exact chaffed wire (the chafe was very VERY small), so after removing the old tape, I put some di-electric grease on the bundle for waterproofing, wrapped the whole bundle in electrical tape and then put two zip ties on each end of the tape to hold it in place and reinforce the bundle.
I removed the problem screw all together and am keeping it just in case. However, it was just one of two screws holding the intake onto a bracket mounted on the engine, so I doubt it will be missed.
DP-Tuner, be advised that I do not have a chip. This was confirmed by removal and inspection of the PCM.
Diane
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Jody & Diane Tipton- DP-Tuner®
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Thread Starter
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Tuned
Joined: May 2008
Posts: 282
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From: Pearl River, LA
Clem!! You are absolutely right. Man, the truck was down for almost three weeks! I was pulling my hair out and grinding my teeth.
Chris, I already looked at the harness going over the drivers side valve cover. As of now it is good to go and I strengthened it with some electrical tape. I also found a yellow wire that went over the drivers side shock and it had already began rubbing on the top of the sock, I bent it in the opposite direction and applied e-tape.
Jody, I cleared out the codes while I was having this problem (codes being P0603 and P0344). Both of them popped back up whenever the wire would short out. I will check the truck again, but I am certain that it is code free at this point in time. If P0603 is still there I will investigate it further.
Chris, I already looked at the harness going over the drivers side valve cover. As of now it is good to go and I strengthened it with some electrical tape. I also found a yellow wire that went over the drivers side shock and it had already began rubbing on the top of the sock, I bent it in the opposite direction and applied e-tape.
Jody, I cleared out the codes while I was having this problem (codes being P0603 and P0344). Both of them popped back up whenever the wire would short out. I will check the truck again, but I am certain that it is code free at this point in time. If P0603 is still there I will investigate it further.
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Joined: Mar 2005
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From: Hoschton,GA
Clem!! You are absolutely right. Man, the truck was down for almost three weeks! I was pulling my hair out and grinding my teeth.
Chris, I already looked at the harness going over the drivers side valve cover. As of now it is good to go and I strengthened it with some electrical tape. I also found a yellow wire that went over the drivers side shock and it had already began rubbing on the top of the sock, I bent it in the opposite direction and applied e-tape.
Jody, I cleared out the codes while I was having this problem (codes being P0603 and P0344). Both of them popped back up whenever the wire would short out. I will check the truck again, but I am certain that it is code free at this point in time. If P0603 is still there I will investigate it further.
Chris, I already looked at the harness going over the drivers side valve cover. As of now it is good to go and I strengthened it with some electrical tape. I also found a yellow wire that went over the drivers side shock and it had already began rubbing on the top of the sock, I bent it in the opposite direction and applied e-tape.
Jody, I cleared out the codes while I was having this problem (codes being P0603 and P0344). Both of them popped back up whenever the wire would short out. I will check the truck again, but I am certain that it is code free at this point in time. If P0603 is still there I will investigate it further.
Diane
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Jody & Diane Tipton- DP-Tuner®
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Custom tuning for 7.3l, 6.0l, 6.4l,6.7l, Ecoboost,
Get Tuned! 828-221-0076 ext. 802
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Jody & Diane Tipton- DP-Tuner®
FTE Legacy Sponsors since 2006
Custom tuning for 7.3l, 6.0l, 6.4l,6.7l, Ecoboost,
Get Tuned! 828-221-0076 ext. 802
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Posting Guru
Joined: May 2006
Posts: 2,274
Likes: 1
From: Milroy, PA
Jody didn't post that. He's was somewhere between GA and CA when I posted. Anyway, its odd but not impossible the code is being set when the short occurs. The Checksum is failing for some reason. A short or surge in power could do it, I'm sure. I'm not an electronics guru, just makes logical sense sometimes. Just like if you disconnect the PCM with the keys in the ignition will cause a PCM to Flake out.
Diane
Diane
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From: Hoschton,GA
With keys just dangling in the ignition slot engages power to the PCM. The batteries don't need to be unplugged if your installing a chip or removing the PCM as long as you have the keys out. That's why we stress to have the keys in your pocket when messing with the chips or PCM. You've been very lucky.
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Hotshot
Joined: Aug 2006
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603 info from the manual :
MA1 CONTINUOUS DTC P0603 IS SET WHEN THE PCM HAS LOST KAPWR
Note: This code may have been caused by disconnecting the PCM or the batteries.
Possible causes:
Battery or PCM has been disconnected.
Battery cables loose or poor connection.
Battery discharged.
Open in KAPWR circuit.
Blown fuse.
PCM.
Check for other codes.
Key on, engine off.
Clear DTCs.
Cycle key off, then on.
Perform retrieve Continuous DTCs.
Was DTC P0603 present?
Yes No
GO to MA2 . Intermittent failure, unable to duplicate. REPAIR other DTCs as necessary. If none, testing is complete. RESTORE vehicle. CLEAR DTCs and RETEST.
MA2 CHECK 5 AMP FUSE (#2 FOR F-SERIES) OR (#27 FOR ECONOLINE)
Key off.
Remove and inspect fuse 2 (F-Series) or fuse 4 (Econoline). If fuse is blown, replace it.
Measure voltage between fuse B+ terminal and ground.
Is voltage greater than 10 volts?
Yes No
GO to MA3 . REPAIR open in battery feed to fuse terminal.
MA3 CHECK FOR VOLTAGE TO PCM
Key off.
Install breakout box, leave PCM disconnected.
Measure voltage between PCM Test Pin 55 and ground.
Is B+ present?
Yes No
RESTORE vehicle; CLEAR DTC, RERUN test. If code reappears, REPLACE the PCM. REPAIR open in circuit 729 (F-Series) or circuit 37 (Econoline). RESTORE vehicle. CLEAR DTCs and RETEST.
MA1 CONTINUOUS DTC P0603 IS SET WHEN THE PCM HAS LOST KAPWR
Note: This code may have been caused by disconnecting the PCM or the batteries.
Possible causes:
Battery or PCM has been disconnected.
Battery cables loose or poor connection.
Battery discharged.
Open in KAPWR circuit.
Blown fuse.
PCM.
Check for other codes.
Key on, engine off.
Clear DTCs.
Cycle key off, then on.
Perform retrieve Continuous DTCs.
Was DTC P0603 present?
Yes No
GO to MA2 . Intermittent failure, unable to duplicate. REPAIR other DTCs as necessary. If none, testing is complete. RESTORE vehicle. CLEAR DTCs and RETEST.
MA2 CHECK 5 AMP FUSE (#2 FOR F-SERIES) OR (#27 FOR ECONOLINE)
Key off.
Remove and inspect fuse 2 (F-Series) or fuse 4 (Econoline). If fuse is blown, replace it.
Measure voltage between fuse B+ terminal and ground.
Is voltage greater than 10 volts?
Yes No
GO to MA3 . REPAIR open in battery feed to fuse terminal.
MA3 CHECK FOR VOLTAGE TO PCM
Key off.
Install breakout box, leave PCM disconnected.
Measure voltage between PCM Test Pin 55 and ground.
Is B+ present?
Yes No
RESTORE vehicle; CLEAR DTC, RERUN test. If code reappears, REPLACE the PCM. REPAIR open in circuit 729 (F-Series) or circuit 37 (Econoline). RESTORE vehicle. CLEAR DTCs and RETEST.
Senior User
Joined: Feb 2010
Posts: 119
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From: Van Wyck SC
I have one of those nightmares at the moment....Ill be taking a closer look in a few minutes.....Ill be bookmarking this thread....Could it be made into a sticky?