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check for battery voltage to the black wire at the fuel injectors with the key on
do you have battery voltage?
does the engine light come on for a couple seconds for the BULB CHECK when you first turn the key on?
let me know and I can further help you
ok well it is normal for the Engine Light to come on when you first turn the key on.
this is the bulb test.. if this does not happen then you are probably loosing power to the
there are a lot of fuses and relays you need to check
check fuse #5 and fuse #2 in the left kick panel fuse panel you should have power to both sides of these fuses with key on.
also check both the ECU fuses under the hood
click here for the fuse locations
let me know what you find.
also you can use a test light or meter to continue
Ok I will be around after noon time eastern tomorrow
I will wait for your reply
there is a 20 amp fusable link that powers the ECU fuses... it seems this fuse link is blown
it shows the Link in the udnerhood fuse panel in the diagram but I have no picture of its exact location
the fuse link powers pin #5 of the (E48 Joint connector in the diagram)
PIN #5 should have power... from there PIN #7 and #8 get power of the E48 JOINT CONNECTOR
if PIN #5 has no power run a jumper wire from battery positive to PIN #5 see if the car runs
if so you need to locate the 20 amp ECU fuse link it feeds PIN#5 of the Joint connector but I do not have an image of its exact location
let me know what you find and if you need more help
no not fuse #7 and #8
these are pins 7 and 8 of the E48 connector
on the side of the underhood fuse panel.. everything you are testing is in that underhood panel
here is the image of the connector to the side of the panel where you will be checking for the power
The ECU2 fuse is energized by the engine control relay inside the car
the Computer grounds the relay to energize the ECU fuse.
if you unplug the relay you should have power on the 2 pinks
if you ground the Gray/Orange with the relay plugged in this should energize the relay and allow the car to start... if so the computer is not grounding the relay...
if you have power to both pinks and grounding the relay does not allow the car to start the relay may be bad
jumper one of the pinks to the Black Wire and the other pink to the green if the car runs replace the relay
click here for the wiring diagram
click here for the relay location
you would not need to splice anything just removing the relay and jumping
just verify you have power to 2 of the pins when you unplug the relay
the computer grounds the relay
let me know what you find
dont forget jumping the wires does not guarantee the relay is the problem
you could also have a problem with the gray/orange ground signal from the computer
you could start with a relay.
you could drive it with the wires jumped as long as they are the same thickness as the existing relay wires.. also be sure they will not touch any metal or ground
remember to click accept so I get credit for my answer
postive feedback is also appreciated
let me know how you make out
when you apply ground to the relay your doing it on the gray/orange correct?
unplug the relay turn the key on.
do you have 12.5 volts to 2 pink wires?
what is your voltage reading at the ECU fuses?
let me know what you find
what is the reading on the ECU fuses? you say it had low power?
..01 at ecu1 with key on? and relay grounded?
the green wire at the relay feeds the ECU1 fuse
do you have battery voltage at the green wire?
also you should have batter voltage to the pinks not 11.8 .. if battery voltage is 12.5 it should be at least 12.3 .. this indicated a poor connection somewhere
please tell be:
voltage at battery -
voltage at E48 connector pins 5,7,8
voltage at pinks to relay -
voltage at green coming out of relay with key on -
let me know these values please
ok you need to plug the relay in and check voltage on the green with key on.
if the green has voltage with key on (relay connected) then you should have power to the ECU1 fuse... the green from the relay powers this fuse.
your computer may not be getting enough voltage to run the car with only 11.8 in the battery put the battery on a slow charger. considering you had the car running before... it appears the low battery voltage is a major factor in why you are no longer running.
either put the battery on a charger or hook up cables from another car and let it charge for an hour or so.
let me know on the green with the relay plugged in also... and the ECU1 with relay plugged in key on.
do not try starting it again until you get your battery voltage back above 12.5
is your battery new?
the computer can not function on 11.8 volts
recharge the battery
and then test the voltage coming out of the relay on the green (relay plugged in)
and the ECU1 fuse again with key on relay in
do not perform these tests until you have at least 12.5 or more in the battery
sounds like you are ok
low battery voltage can cause all the problems you are currently having
you can not test the ground or relay with battery voltage being so low
its only a big deal of you start the car in gear
this means the clutch switch is bypassed
as long as you dont try to start the car while it is in gear and without pushing in the clutch it is not a big deal.
it will just cause the car to jump if you do this
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