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Old 09-05-2021, 08:31 PM   #1
WREXJake
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Member#: 474259
Join Date: Sep 2017
Chapter/Region: Tri-State
Location: CT
Vehicle:
2005 WRX
18L

Default Cranks but no Injector Pulse. Has spark,pump primes.

Is anyone able to help me out with an ecu pin out or injector circuit for an 05 Wrx? Iíve been chasing an issue with my car where none of my injectors are firing. Checked grounds, fuses, harnesses, verified fuel pressure etc. Iím getting spark, fuel pump primes but no injector pulse. Iíve checked voltage at the pins for the injector connectors with key on and nothing however Iím not sure if I should be seeing anything unless itís under cranking conditions, same applies to crank and cam sensors. As far as I know the injectors all share a common power and are pulsed by ground through the ecu but Iím not the best with electrical diag. Any tips on where to go or what to check from here would be appreciated.
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Old 09-06-2021, 10:46 AM   #2
Elbert Bass
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Join Date: May 2011
Chapter/Region: South East
Location: Down yonder.
Vehicle:
2016 Fuji Sunfire 03
Silver

Default

Quote:
Originally Posted by WREXJake View Post
Is anyone able to help me out with an ecu pin out or injector circuit for an 05 Wrx? I've been chasing an issue with my car where none of my injectors are firing. Checked grounds, fuses, harnesses, verified fuel pressure etc. I'm getting spark, fuel pump primes but no injector pulse. I've checked voltage at the pins for the injector connectors with key on and nothing however I'm not sure if I should be seeing anything unless it's under cranking conditions, same applies to crank and cam sensors. As far as I know the injectors all share a common power and are pulsed by ground through the ecu but I'm not the best with electrical diag. Any tips on where to go or what to check from here would be appreciated.
First yes - power is supplied to injectors (red wire) from the main relay with key in the run position and the ECM grounds them to make them open.
You say you have checked voltage at pins for injectors but nothing - does that mean you have no voltage? With key on you should have battery voltage at the injectors. You will see voltage at both sides since the ECM is not grounding them.
If you have spark then you have a good crank sensor signal.

Have you noticed a flashing red "key" light in the cluster when trying to start? That would be the immobilizer and that stops injectors from firing. Either a problem with the immobilizer, the car has forgotten the key you are using or the key you are using is not programmed to the car.
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Old 09-06-2021, 11:38 AM   #3
snow_bound26
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Member#: 395793
Join Date: Jul 2014
Chapter/Region: Tri-State
Location: SLC and Lake Placid
Vehicle:
2005 92x Aero
Beige

Default Cranks but no Injector Pulse. Has spark,pump primes.

05 WRX doesn't have an immobilizer so he should have to worry about that.

Check all your pins for loose connection.
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Old 09-09-2021, 09:17 PM   #4
WREXJake
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Member#: 474259
Join Date: Sep 2017
Chapter/Region: Tri-State
Location: CT
Vehicle:
2005 WRX
18L

Default

Quote:
Originally Posted by snow_bound26 View Post
05 WRX doesn't have an immobilizer so he should have to worry about that.

Check all your pins for loose connection.
Fixed it, traced main power lead through harness and it had a break. Fixed had voltage boom done. My issue now is the car starts revs a bit then dies. Gone through literally everything and Iím stumped.
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Old 09-10-2021, 06:10 AM   #5
snow_bound26
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2005 92x Aero
Beige

Default

Quote:
Originally Posted by WREXJake View Post
Fixed it, traced main power lead through harness and it had a break. Fixed had voltage boom done. My issue now is the car starts revs a bit then dies. Gone through literally everything and Iím stumped.


Try unplugging your MAF and see if it changes anything
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Old 09-10-2021, 08:19 PM   #6
Elbert Bass
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2016 Fuji Sunfire 03
Silver

Default

Quote:
Originally Posted by snow_bound26 View Post
05 WRX doesn't have an immobilizer so he should have to worry about that.

Check all your pins for loose connection.
Not according to the 2005 FSM turbo wire diagram and owners manual. According to both publications WRX - STI have immobilizer. The n/a Impreza does not I guess Subaru could be wrong...
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Old 09-12-2021, 07:58 AM   #7
snow_bound26
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Join Date: Jul 2014
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2005 92x Aero
Beige

Default

Quote:
Originally Posted by Elbert Bass View Post
Not according to the 2005 FSM turbo wire diagram and owners manual. According to both publications WRX - STI have immobilizer. The n/a Impreza does not I guess Subaru could be wrong...


Neither of my 05s have had an immobilizer. To my knowledge 16bit cars didn't have an immobilizer in the US. 32bit cars did have the immobilizer, except possibly the 04 STi and 04 Forester XT. I know the v9 207 was the first JDM 16bit ECU that had an immobilizer. I believe what you're reading in he FSM is specifically for the STi wiring.
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Old 09-12-2021, 08:47 AM   #8
benflynn
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It will have a security light blinking at ya if itís immobilized, when mine is locked it will start and rev for a sec then dies with blight blinking
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Old 09-12-2021, 10:55 AM   #9
Elbert Bass
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Member#: 283429
Join Date: May 2011
Chapter/Region: South East
Location: Down yonder.
Vehicle:
2016 Fuji Sunfire 03
Silver

Default

Quote:
Originally Posted by snow_bound26 View Post
Neither of my 05s have had an immobilizer. To my knowledge 16bit cars didn't have an immobilizer in the US. 32bit cars did have the immobilizer, except possibly the 04 STi and 04 Forester XT. I know the v9 207 was the first JDM 16bit ECU that had an immobilizer. I believe what you're reading in he FSM is specifically for the STi wiring.
Now that I go back and look you probably are right. IMB-2 (page WI 100) identifies the ECM and security module connections as STI.
Wouldn't be the first time I had to actually have car in hand to determine the FSM electrical section had to be "interpreted" based on what you saw in the car. They get worse the older the model.
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