i just went through the typical "no start" scenario and i'm 99% sure my problem is a dead ECU. i have an '89 900 Turbo
weeklong story short:
there was a similar post by saab89 that has talked about ECU's. so hopefully i'm not repeating any questions that have already been answered. but i still have a couple questions and you guys know your shiite
:
thanks a lot for your time.
- james
weeklong story short:
- good fuel pressure to the injectors
- jumping pins #20 and #21 with relays in and ECU out runs fuel pump and gives power to injectors
- grounding pin #18 fires all injectors with #20 & #21 grounded, relays in, and ECU out
- with voltmeter across pins #1 and #17 there is AC voltage of 4.2 while cranking.
- there is a spark at the plugs when cranking
- with relays and ECU connected, and pins #20 & #21 grounded (ran ground through back of connector. the car will not start. i had heard that even with a bad ECU it might run if those pins were grounded. not sure if this was true or not.
there was a similar post by saab89 that has talked about ECU's. so hopefully i'm not repeating any questions that have already been answered. but i still have a couple questions and you guys know your shiite
- i'm wondering if it is certain that an ECU from a '90-'93 900 turbo will work ?? e.g.,0 280 000 948 (or 582). the bentley mentions other years as having 29-pin connectors. i'm wondering if there's a chance that it won't match up.
- is there any way to possibly rig the wiring so that the car can be driven ?? i'm presently stranded and it's a little tough
- if / when i change the ECU should i also buy new relays ?? are they the possible cause ?? and if needed, can i buy them from somewhere like eeuroparts.com or should i pay twice the amount and go to the dealer ??
- is there any way to check the ECU or potentially fix the ECU. i have access to an oscilloscope, VM, etc.
thanks a lot for your time.
- james