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1999 falcon au xr6 injectors not pulsing 

 

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 Post subject: 1999 falcon au xr6 injectors not pulsing
Posted: Sat May 18, 2013 2:42 am 
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Ride: 1999 ford falcon au xr6

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Hi there im new to this forum and is the current owner of a 1999 ford falcon au xr6 :D , i bought this vehicle and it just died on me the next day, i've tried everything and nothing seems to work, the car refuses to start,symptoms are below:

the car has got good strong spark at the plugs and all are firing well (car starts nd revs if fuel is added through the intake)
the injectors are not opening , fuel pump comes on and fuel is at the rail
new crank sensor
all fuses have been changed, relays have been changed or bridged
alarm and immobiliser bridged
new ecu( old one was tested and is fine)
new body control module
no breaks or shorts in wiring, everything has been checked with a fine tip comb :?

i desperately need this car to run :( and require anybodies help and advice
i am in south africs and spares are not easily available and very pricy
thanks in advance :)
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 Post subject: Re: 1999 falcon au xr6 injectors not pulsing
Posted: Sat May 18, 2013 9:04 am 
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Ride: ford falcon au3 xr8

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if the ecu is not faulty, I cant see all 6 injectors not having a pulse..

have they got a power supply> the injectors are triggered by earth trigger and should have constant 12v with ignition on..

only other thing that comes to mind is the cam position sensor??
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 Post subject: Re: 1999 falcon au xr6 injectors not pulsing
Posted: Sat May 18, 2013 7:34 pm 
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what cam position sensor?

the crank angle sensor has been changed that will stop it starting

if there is a new bcm then that needs to be coded to the ecu
otherwise the car wont start at all but i doubt thats the case as it cranks over fine

 

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 Post subject: Re: 1999 falcon au xr6 injectors not pulsing
Posted: Sat May 18, 2013 7:37 pm 
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the cam position sensor is in the front of the timing case and reads off the aux gear...
it has a reference to tdc on compression stroke to determine starting point to fire injectors(sequential)
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 Post subject: Re: 1999 falcon au xr6 injectors not pulsing
Posted: Sat May 18, 2013 7:44 pm 
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i think the crank angle sensor and cam sensor are the same then?

 

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 Post subject: Re: 1999 falcon au xr6 injectors not pulsing
Posted: Sat May 18, 2013 7:51 pm 
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there is definitely 2 sensors, the cam sensor is next to the crank sensor.

http://thumbs4.ebaystatic.com/d/l225/m/ ... V1MrBg.jpg

but ive never heard of one failing though, but you never know..
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 Post subject: Re: 1999 falcon au xr6 injectors not pulsing
Posted: Sat May 18, 2013 10:06 pm 
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As said earlier, check that 12+ is present at the injectors. If you have 12v there, check the cam sensor. It lives right next to the crank angle sensor.

If you don't have 12v at the injectors, Check the EECV relay in the box next to the battery.
If the relay is fine, there is an EECV diode that supplys power to trigger the relay.
Also check for continuity from the eecv relay to the injectors.

Cheers Mick
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 Post subject: Re: 1999 falcon au xr6 injectors not pulsing
Posted: Sun May 19, 2013 3:28 am 
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Hi there thanks Dr the responses,the injectors do have 12 volts plus hen the key is turned on, with regards to the bcm, how do I get that coded to the ecu ?

The crank angle sensor has been changed but I cannot locate the can angle sensor and have been told about that before
All relays and fuses are new coz I made sure every single one is changed

Thanks again guys looking forward to more responses :)
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 Post subject: Re: 1999 falcon au xr6 injectors not pulsing
Posted: Sun May 19, 2013 9:55 am 
Oompa Loompa
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Location: Werribee
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If there was a problem with the ecu not being coded, the engine would not crank, there would be no spark and you would not be able to make it run by pouring fuel in.

Check the cam angle sensor. If you are standing looking at the front of the engine, it will be right next to the crank angle sensor. Perhaps remove the belt to make it easier to see. It is a little black round thing with 1 bolt.

Cheers Mick
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 Post subject: Re: 1999 falcon au xr6 injectors not pulsing
Posted: Sun May 19, 2013 6:12 pm 
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Thanks a lot mike for your response mike I'm going to look at the cam sensor now also this is the vct model
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 Post subject: Re: 1999 falcon au xr6 injectors not pulsing
Posted: Sun May 19, 2013 6:52 pm 
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Hi there I removed the cam sensor, nd cleaned it up I also checked the wiring nd all seemed well there, how would I know if the cam sensor is damaged nd where do I go from here ?
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 Post subject: Re: 1999 falcon au xr6 injectors not pulsing
Posted: Sun May 19, 2013 10:23 pm 
Oompa Loompa
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Location: Werribee
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You need to test the resistance of the windings. It should be about 1k ohms, mine was about 980 ohms measured from the back of the pcm with the sensor still plugged in and in the engine. Anywhere around that it should be fine. If it is reading an open circuit or values in the M ohm (Mega ohms) it is buggered.

If you have access to an oscilloscope you can check the signal coming from the sensor. There should be 1 large sine wave every 2 engine revolutions. If that is there then this is not the problem.
Another thing to check with the scope are the pulses for the injectors, just check if they are actually not pulsing. Alternatively you could use a multimeter, with the engine not turning over the voltage should stay the same, when cranking it will jump around, but his is not as accurate as an oscilloscope. A good workshop or electronics tech should have one....

Cheers Mick
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 Post subject: Re: 1999 falcon au xr6 injectors not pulsing
Posted: Mon May 20, 2013 7:00 am 
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Ride: 1999 ford falcon au xr6

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NSW, Australia

Lol this is the first time I'm hearing about such high tech equipment but I will check the ohms as soon as possible, I hope this is the problem as I'm running out of thongs to blame lol
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 Post subject: Re: 1999 falcon au xr6 injectors not pulsing
Posted: Mon May 20, 2013 7:06 am 
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Ride: 1999 ford falcon au xr6

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NSW, Australia

And also I forgot to mention is that ever since the car stopped running nothing seems to work, no electri windows, central locking, aircon ... Nothing comes on or works

Could it be the body control module that's causing this and the not starting issue ? And is the bcm interchangeable from the ef falcons ?
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 Post subject: Re: 1999 falcon au xr6 injectors not pulsing
Posted: Mon May 20, 2013 1:41 pm 
Oompa Loompa
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Age: 36

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Joined: 15th May 2013

Ride: AU LPG falcon

Location: Werribee
VIC, Australia

I doubt that the bcm is interchangeable. Just for simplicity sake can you put the original pcm back in. I will have a look at the wiring diagram after work and see if I can see anything that is common to all the effected systems. Perhaps a bad earth hidden somewhere, or bad power wire in a plug.

The alternative, put a carbie or gas system on it!!! :D


Cheers Mick
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