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Old 11 Mar 2012, 11:55 AM   #1 (permalink)
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new guy help needed

hi im a semi competent mechanic and ive had my impreza a year now with no faults. suddenly driving yesterday my car cut out completely, when diagnosed there is no power to the fuel pump, coil packs, injectors and my check engine light is not lighting up, the main relay (12v) has a feed to it and ive swapped it for a new one but still no power, help guys whats the next step! thanks any help apreciated, starter turns over as well and all ancilleries such as lights work. does it sound an immobiliser or ecu issue? normally when i disarm the alarm you can here a relay click (its a 93 import wrx with sigma alarm) but now theres no click
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Old 11 Mar 2012, 12:04 PM   #2 (permalink)
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Re: new guy help needed

the plug under the rear seat is known to fail, might be worth a look
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Old 11 Mar 2012, 12:08 PM   #3 (permalink)
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Re: new guy help needed

theres no power to that ive checked, would that affect all the other problems such as the check engine light not lighting up or no spark?
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Old 11 Mar 2012, 12:27 PM   #4 (permalink)
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Re: new guy help needed

have you checked all the fuses ?
has it got an immobiliser?
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Old 11 Mar 2012, 12:44 PM   #5 (permalink)
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Re: new guy help needed

yea ive checked all fuses, fusible link etc. there all fine, its got the sigma series alarm on it which im suspecting has gone next on my list will be to check earths as the main relay has 12v in, but all other pins are 0.43v as if ones not earthing
, theres no fuel cut off on a impreza is there?
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Old 11 Mar 2012, 02:22 PM   #6 (permalink)
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Re: new guy help needed

easiest way to rule the alarm out is trace the wires and just temp bridge them as they are just 2 pairs.
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Old 11 Mar 2012, 07:43 PM   #7 (permalink)
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Re: new guy help needed

il try it thanks, cant find the alarm system anywhere it must be pretty well hidden, also is a z4 ecu the standard ecu (the one that cant be mapped or chipped)?
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Old 13 Mar 2012, 09:17 AM   #8 (permalink)
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Re: new guy help needed

the sbf fuse had blown! bit worried why its blown as i dont know what it feeds though
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