Injector circiuit low
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Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
Injector circiuit low
I'll be driving my truck down the road and all will be fine, then suddenly misses, steady for 2-3min, then it goes away. Mean while I'm monitoring everything and nothing seems strange. So I decide to do a buzz test, thinking an injector is bad. The code list I get back is crazy, P0261-P0282, every cylinder says injector circuit low. Mean while when this happens my FICM shows a solid 48.5v. I repaired my FICM 10 years ago and it has been flawless since. I checked the connectiosn to make sure they were snug, and all was good. I don't see how it's possible that every single injector has a low voltage, it would have to be somewhere else. I'm not aware of anything between the FICM and the injectors though.
Can anyone shed some light on this?
Can anyone shed some light on this?
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,246
Likes: 761
From: Houston, Texas
Sounds like your logic side may have taken a dump. I had a customer a few years ago that the injectors would occasionally buzz KOEO. Power side showed a steady 48-49 volts but his logic side was toast. Another shop replaced the Ficm and he was back on the road.
You may also check the wiring harness under the Ficm itself. On some 2004 trucks the rear of the plug may be exposed causing chaffing. It was a common thing on the 2004 trucks. They ended up rerouting the engine harness that year because of the chaffing.
You may also check the wiring harness under the Ficm itself. On some 2004 trucks the rear of the plug may be exposed causing chaffing. It was a common thing on the 2004 trucks. They ended up rerouting the engine harness that year because of the chaffing.
Thread Starter
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Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
I monitor my voltage al the time with the torque app, when it happens the ficm voltage is still a solid 48.5v
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Data on the bus has two “states” low or high. I think the fault code doesn’t refer to a low voltage problem but to a data issue.
maybe three states, I think there is a null also- neither hi or low.
maybe three states, I think there is a null also- neither hi or low.
Fleet Owner
Joined: Nov 2003
Posts: 27,897
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I think he was suggesting to monitor the logic voltage as well as the main voltage (FICM LPower).
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Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
I'll see if I have that as an option.
Here's a little video of when I'm driving. It seemed to be consistent yesterday. https://i.imgur.com/zCyUes8.mp4
Here's a little video of when I'm driving. It seemed to be consistent yesterday. https://i.imgur.com/zCyUes8.mp4
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