lout
Well-Known Member
- Joined
- May 13, 2006
- Messages
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- Age
- 60
- Location
- Langwarrin Victoria
- Members Ride
- VXii Executive V6 , VYii Adventra LS1
need a little help with a 2005 VZ V6 wagon
has the service vehicle soon, low fuel , loss of communication to ECU
car has been diagnosed as faulty ECU by another mechanic
but i have been asked for a second opinion, it is a workmates wife's car
turning ignition to reds and bypassing crank relay starts engine and brings ecu online
ECU faults can then be cleared
and all is normal for half hour after car is turned off
with start relay reinstalled, car starts like normal
in my mind this cannot be an ECU fault,
what does bypassing start relay do that brings ECU back on line
is it a communication wake up, if so which protocol
is it a current draw
trying to narrow down the diagnosis as time is a bit short this weekend
have checked the grounds which seem fine
will be pulling ECU plugs apart tomorrow and start scoping things out
has the service vehicle soon, low fuel , loss of communication to ECU
car has been diagnosed as faulty ECU by another mechanic
but i have been asked for a second opinion, it is a workmates wife's car
turning ignition to reds and bypassing crank relay starts engine and brings ecu online
ECU faults can then be cleared
and all is normal for half hour after car is turned off
with start relay reinstalled, car starts like normal
in my mind this cannot be an ECU fault,
what does bypassing start relay do that brings ECU back on line
is it a communication wake up, if so which protocol
is it a current draw
trying to narrow down the diagnosis as time is a bit short this weekend
have checked the grounds which seem fine
will be pulling ECU plugs apart tomorrow and start scoping things out