Fuel injection wiring diagram ?
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Fuel injection wiring diagram ?
I am working on the neighbors gasoline v-8 2005 E-250. It has a 4 amp power draw at the positive battery terminal which runs down the battery pretty quick. I isolated it to the yellow cable that runs to the under hood fuse box. I checked the starter and alternator for the drain but they were both OK. Then I checked all the under hood relays. All good Then I did all the small fuses- all good. PCM diode - OK. ( read 380K one way and infinite the other way- drain did not quit when diode pulled)
Then I tested all the big fuses one at a time. I discovered that the drain quit when I pulled fuse # 22. #22 is labeled as :
"I/P fuses 4,5,10,11,16,17,22,23 and circuit breaker #44 "
I assume "I/p" refers to fuel injection ---- perhaps the 8 fuel injection wires (?????) I can find no mention of what breaker 44 is - or what it does- or where it is.
This power drain is going with key off and engine off. The engine seems to run perfectly smooth-- so it seems like the injectors are operating nicely when engine running. i am thinking for there to be current flow with engine off--- there would have to be a blown transistor or a stick-on power relay for the module that controls the injection. I am also guessing that there has to be a bank of 8 power transistors (somewhere) between the PCM and the injectors to amplify current to operate the injectors. Would that be the FICM its self ????? i pulled every relay under the hood- and none stopped the drain. Could the FICM power relay be in the under-dash fuse box----possibly -- and be stuck on ? The drain is about 4.0 amps. Would the FICM draw that much ? could all the injectors be energized all at once somehow ? ( I guess I can test that ---- voltmeter on injector wires ?)
Do yall think I am right to look at the FICM relay ? Is that what fuse 22 is doing (or breaker 44- whatever that is --)
does anyone know where I can find a wiring diagram showing the fuel injection system so I can at least see what fuse #22
is controlling ? Cant seem to find that anywhere on line...... very frustrating. The common haynes repair manuals don't have diagrams for the fuel injection-- nothing at all.
Hard to troubleshoot with no diagram---- becomes guess work.......
Then I tested all the big fuses one at a time. I discovered that the drain quit when I pulled fuse # 22. #22 is labeled as :
"I/P fuses 4,5,10,11,16,17,22,23 and circuit breaker #44 "
I assume "I/p" refers to fuel injection ---- perhaps the 8 fuel injection wires (?????) I can find no mention of what breaker 44 is - or what it does- or where it is.
This power drain is going with key off and engine off. The engine seems to run perfectly smooth-- so it seems like the injectors are operating nicely when engine running. i am thinking for there to be current flow with engine off--- there would have to be a blown transistor or a stick-on power relay for the module that controls the injection. I am also guessing that there has to be a bank of 8 power transistors (somewhere) between the PCM and the injectors to amplify current to operate the injectors. Would that be the FICM its self ????? i pulled every relay under the hood- and none stopped the drain. Could the FICM power relay be in the under-dash fuse box----possibly -- and be stuck on ? The drain is about 4.0 amps. Would the FICM draw that much ? could all the injectors be energized all at once somehow ? ( I guess I can test that ---- voltmeter on injector wires ?)
Do yall think I am right to look at the FICM relay ? Is that what fuse 22 is doing (or breaker 44- whatever that is --)
does anyone know where I can find a wiring diagram showing the fuel injection system so I can at least see what fuse #22
is controlling ? Cant seem to find that anywhere on line...... very frustrating. The common haynes repair manuals don't have diagrams for the fuel injection-- nothing at all.
Hard to troubleshoot with no diagram---- becomes guess work.......
Last edited by jethro62; May 22, 2024 at 11:58 PM. Reason: addition
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no-- gas v-8 engine-----
and like maybe the Ficm is "on" when the engine is off and the PCM is giving it no inputs....... and it could be holding all the injectors in the open position. (like 1/2 amp each times 8 = 4 amps draw )
I would have thought the ficm power relay would be under the hood-since that would be where the injection wiring lives. But none of the under hood relays stopped the current draw when I pulled them one at a time.
Anyone know where the FICM power relay is located ? and is fuse #22 for the injection system ? (I/P abreviation---)
tim
I have not checked the under-dash fuse panel yet.
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OK--- updates on tracing the electrical drain....
Visited the local stealership and the parts guy said the "I/P" was the instrument panel.
I then pulled each of the 8 fuses listed-- which were located in the under dash fuse panel.
One of them- fuse #22--- was the source of the drain. It has listed under what it feeds---- the instrument panel, the radio memory, the battery saver relay, courtesy lamp relay, and acc delay relay.
I pulled the acc relay and that changed nothing. Tomorrow I will try to pull the radio power---- where ever that is.
That leaves the instruments and the BSR. My web research seems to indicate the BSR is somewhere on the instrument panel circuit board (?????) - I can find no mention of it anywhere external where I can reach it. I have pulled the fuse for the overhead lights just to take them out of play for now--- for when im reading current. I am still getting about 1.8 amps drain---
i suspect the radio memory isnt soaking up that much. So that leaved the cluster proper and the bsr.
anyone have any ideas how to proceed ? i may try to start it tomorrow and see if any cluster functions seem to be not working. I have had a ford truck dash cluster out one other time--- and I can say it wasnt too much fun.
And--- Is there anything I can do --to it--- once its out ? (besides order an overhauled one ---)
Is there a certain part in the cluster that fails like this and draws current ? And would a device on the cluster fail and cause a key off current draw ? Is there anything in the cluster that is Hot all the time ? (with key off) I was told at the parts dept that the radio may be hot all the time (with key off) Can anyone verify that ? does the radio operate with the key off and out ?
Tim
Tim
Visited the local stealership and the parts guy said the "I/P" was the instrument panel.
I then pulled each of the 8 fuses listed-- which were located in the under dash fuse panel.
One of them- fuse #22--- was the source of the drain. It has listed under what it feeds---- the instrument panel, the radio memory, the battery saver relay, courtesy lamp relay, and acc delay relay.
I pulled the acc relay and that changed nothing. Tomorrow I will try to pull the radio power---- where ever that is.
That leaves the instruments and the BSR. My web research seems to indicate the BSR is somewhere on the instrument panel circuit board (?????) - I can find no mention of it anywhere external where I can reach it. I have pulled the fuse for the overhead lights just to take them out of play for now--- for when im reading current. I am still getting about 1.8 amps drain---
i suspect the radio memory isnt soaking up that much. So that leaved the cluster proper and the bsr.
anyone have any ideas how to proceed ? i may try to start it tomorrow and see if any cluster functions seem to be not working. I have had a ford truck dash cluster out one other time--- and I can say it wasnt too much fun.
And--- Is there anything I can do --to it--- once its out ? (besides order an overhauled one ---)
Is there a certain part in the cluster that fails like this and draws current ? And would a device on the cluster fail and cause a key off current draw ? Is there anything in the cluster that is Hot all the time ? (with key off) I was told at the parts dept that the radio may be hot all the time (with key off) Can anyone verify that ? does the radio operate with the key off and out ?
Tim
Tim
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Joined: Oct 2023
Posts: 71
Sure... I have the Ford Service DVDs for 2002 to 2010. There are several different colors of DVDs which I've been told don't differ much but I have the red ones.
They are all over E-Bay and the prices are all over the board as well.
They are all over E-Bay and the prices are all over the board as well.
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Joined: Oct 2023
Posts: 71
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Joined: Jun 2010
Posts: 16,560
jethro62,
There is no such thing as an FICM in gasoline engines, that threw a monkey wrench in there.
An FICM is only with diesel engines.
A simple test lamp can verify if power is present at ALL fuel injectors when the key is off, there should be no power there.
Until you get another instrument cluster, you might consider removing the negative battery cable when parking the vehicle for a period of time.
Pulling fuses is not the recommended way to locate a parasitic drain. The better way is to measure the voltage drop across the fuses and the one supplying the unintended current will show a voltage drop. There are some good videos explaining this procedure..
There is no such thing as an FICM in gasoline engines, that threw a monkey wrench in there.
An FICM is only with diesel engines.
A simple test lamp can verify if power is present at ALL fuel injectors when the key is off, there should be no power there.
Until you get another instrument cluster, you might consider removing the negative battery cable when parking the vehicle for a period of time.
Pulling fuses is not the recommended way to locate a parasitic drain. The better way is to measure the voltage drop across the fuses and the one supplying the unintended current will show a voltage drop. There are some good videos explaining this procedure..
