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1999 SAAB 9-3 repair Question No Voltage at the Fuel Injecto

Tiny
HP
  • MEMBER
  • 1999 SAAB 9-3
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 134,000 MILES
I parked my car at my driveway and went on Vacation for 4 days. After my Vacation I try to start the Engine in the morning and the Starter turned but no Ignition.
I check everything out and found no Voltage to the Fuel Injectors.
I changed the Crankshaft Position sensor and have also Sparks. It will run on independent fuel source
I don't know what controls the Injectors. Is it the ECU or the twice system?
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Tuesday, June 16th, 2009 AT 9:02 AM

12 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
Injectors power from ignition discharge module on valve cover green/red wire. Ground is provided by computer.
Hope this helps
Thanks for donate
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Tuesday, June 16th, 2009 AT 1:53 PM
Tiny
HP
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  • 6 POSTS
I think the ECU controls the injection on a Saab?
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Tuesday, June 16th, 2009 AT 1:57 PM
Tiny
DOCFIXIT
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That's what I said ground controled by ECU ie. Computer. Power come from module
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Tuesday, June 16th, 2009 AT 2:01 PM
Tiny
HP
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  • 6 POSTS
Ignition Module works
I dont have ground from ECU
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Tuesday, June 16th, 2009 AT 2:13 PM
Tiny
DOCFIXIT
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Check green/red wire coming out of Ign Dis Module it supplies power to injectors. If you have power and no ground then ECU is possibly faulty.
I'm confused your post started no power know no ground. Let me know
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Tuesday, June 16th, 2009 AT 3:54 PM
Tiny
HP
  • MEMBER
  • 6 POSTS
Green/red wire is OK
Sorry for the confusion, but that's the details I needed.
I have all grounds missing from the ECU
I will replace the ECU
I let you know
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Wednesday, June 17th, 2009 AT 7:23 AM
Tiny
DOCFIXIT
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Good luck and yes let me know
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Wednesday, June 17th, 2009 AT 9:12 AM
Tiny
HP
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  • 6 POSTS
I forgot to ask!
Voltage from green /red wire is pulsing
Is this correct?
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Wednesday, June 17th, 2009 AT 9:27 AM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Are you checking at injector terminal? If yes then ECU must be grounding the pulses indicate injector on/off. Can you feel or hear injector click? Can you get a noid light hook up will tell if ECU is firing injector
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Wednesday, June 17th, 2009 AT 10:28 AM
Tiny
HP
  • MEMBER
  • 6 POSTS
Car is running again.
Bad ECU
Bad Ignition Cassette (Orange Sparks)
Bad fuel pump
All at the same time!

Thanks for your help!

Hp
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Wednesday, July 1st, 2009 AT 8:08 AM
Tiny
DOCFIXIT
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I have never seen so much stuff go out at once. No wonder you where having such a time diagnosing.
Glad it is running. Thanks for letting me know
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Wednesday, July 1st, 2009 AT 11:28 AM
Tiny
MNTHNY4
  • MECHANIC
  • 612 POSTS
I did not see where you did a fuel pressure test, to find out if fuel pump is working or not, plus check relays located under the d/s dash panel, just below where dice unit is located, saab ecm do not go that easy, & saab system is all about power to grounds so do not mess with it if u do not understand it, check basic system first, do not get all technical, saab's are expensive to repair if u blow the ecm module.
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Saturday, August 29th, 2009 AT 8:17 PM

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