car wont start or go into diag

[lord_davros]

i jump started my car as it whent flat today and now she wont start.
i have checked the fuel pump and thats all good.. it still turns over but no go.
there is no engine light when the ignition is on and when i try to put it into diag mode the light does not come on (i have checked the globe :P )

could this mean a totally fried ecu?

als i could not get a voltage reading form the map sensor.. i assume that this could also be due to a dead ecu.

any help would be great..

thanks all
dave

[Matt_vp]

my vp was doing this intermediatly for a while and the only way i could get the car to start was to arc out 2 wires on my aldl link, the 12 volt one and the fuel pump test wire. or the 2 that are on the other side if u where doing a dianostic check.
the problem went away after changing the fuel pump when it finally wouldn't work anymore.
hope this helps
MATT

[lord_davros]

i have tried hard wiring the fuel pump to see if it is the problem and it still wont start. i just find it strange that it wont let me go into diag mode to see for error codes. thats why i thought mabey the computer is kaput.. i figure no computer no diagnostic mode..
also without hardwiring the fuel pump there is only .3 volts to the pump. same as at the map sensor.

[lord_davros]

replaced computer today and still nothing any help would be great as its quite urgent.. i cant be without a car for too long..

[keza87]

Maybe, being a calais, the alarm is playing up and preventing the ECU from powering up
I know on my mum's old calais the alarm was really touchy

[Cheap6]

Maybe, being a calais, the alarm is playing up and preventing the ECU from powering up
I know on my mum's old calais the alarm was really touchy

Good point. Or the alarm overide switch?

[lord_davros]

ohh sorry that was darn stupid of me.. i have not updated. my new one is a bog standard 91 vn. last of the series one engines

[Cheap6]

Maybe start with: Spark?, Fuel (injector pulse)?, Fuses/fusible links?,

[lord_davros]

i should be able to check for pulse with a multi meter right?,

[keza87]

Checked all the fuses??
I know there are testing procedures in the gregories manual for the ECU, but considering you have replaced it, its sounding like there isn't any power getting to it

[PaRaDoX]

No diagnostics mode screams ecu to me, check that your memcals not dislodged, borrow a mates and test if it works,

failing that find out if its getting fuel, remove a spark plug and get a mate to crank it over, and smell the air comming outta teh spark plug hole, if its not fuel smelling then no fuel = ecu

if its fueling but not sparking then its not ecu, get a lead and a spare plug, plug the head into the spare plug then ground the plug on somewhere like the strut tower bolts , resting will be fine, ive been zapped a few times by holding it and leaning across

if its not sparking or not injecting then its probbly ecu, get under the rear and get a mate to turn it to reds and listen for hte fuel pump prime, no prime = ecu issue/wiring issue

[lord_davros]

ok. i have checked with a known working computer (drove the car to mine). still nothing. checked power feed to ecu all good, checked fuses and fuasble links all good, i am at a loss.. are there any hidden fuses or anything like that i should check?
and is there anyone in sa who lives near moana who would be able to help as i need this car badly... cant have a baby and no car dammit.. lol

[lord_davros]

have tried it with a hard wired fuel pump as well and still nothing..

[lord_davros]

all good everyone.. turns out there was a kill switch on the centre console and when i lifted the carpet back i switched it on.. lol.. the guy i got it off of never told me about it.. man i feel like a right idiot.. must say though i would never have found out if i didnt have a multi meter..

[FuzzayD]

I had a problem with my vn shorting out when i turned the key past power, i asked my mate what to do and he took out the starter motor and threw it against a brick wall then she whent just fine.
Good to see you got it going, at least you know you have a well concealed kill switch mine is the aerial.