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  1. 05-24-2016 08:37 PM #1
    VanCityA4Q
    VanCityA4Q is offline
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    307241
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    5v signal for O2 sensor, MAF and CPS.

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    Can anyone tell me where this signal originates from, car is a 2000 1.8t.

    I've followed the lines in my Bentley manual and it all leads back to my fuel pump relay I believe.

    I drove the car and all was fine, shut it off and I'm pulling Map sensor codes cam sensor codes and MAF sensor codes, related to the 5v signal line.




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    2001A41.8TQM Cat delete, 3"exhaust Turbonetics T3/T4 .63 A/R@18PSI, ATP Exhaust manifold, precision Turbo 39mm wastegate, Forge Splitter, FMIC, 80mm TB, SEM Motorsports Intake, AEB ported/polished, 3 angle valve seats with Supertech inconel exhaust valves/SS Intake, upgraded valve springs/ TI retainers, ARP head stud/main bearing stud kit, Skat rods/stock pistons, solid motor mounts, race density trans/snub/diff carrier mounts, stage 4 clutch with SM12lb flywheel, tuning by Motoza Performance
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  2. 05-24-2016 08:39 PM #2
    VanCityA4Q
    VanCityA4Q is offline
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    307241
    Location
    Vancouver British Columbia

    I'm only showing .9v on the green/yellow wire that is supposed to be a minimum of 4.5v and I can trace it back to the fuel pump relay then I'm lost lol


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    2001A41.8TQM Cat delete, 3"exhaust Turbonetics T3/T4 .63 A/R@18PSI, ATP Exhaust manifold, precision Turbo 39mm wastegate, Forge Splitter, FMIC, 80mm TB, SEM Motorsports Intake, AEB ported/polished, 3 angle valve seats with Supertech inconel exhaust valves/SS Intake, upgraded valve springs/ TI retainers, ARP head stud/main bearing stud kit, Skat rods/stock pistons, solid motor mounts, race density trans/snub/diff carrier mounts, stage 4 clutch with SM12lb flywheel, tuning by Motoza Performance
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  3. 05-27-2016 07:35 PM #3
    VanCityA4Q
    VanCityA4Q is offline
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    307241
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    Ok, found my leak detection pump was shot and draining my voltage, got my signal line up to 3.4 volts now, also throwing P0106 barometric pressure sensor implausible signal. Ecu is not shot as I have tried 2 others that are known to be working. I've traced all my lines, checked for continuity and they are all good, also checked power supply to ecu in all 3 locations. Car still won't start :(
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  4. 05-29-2016 12:22 AM #4
    VanCityA4Q
    VanCityA4Q is offline
    Established Member Two Rings
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    AZ Member #
    307241
    Location
    Vancouver British Columbia

    Melted MAF wire and main power supply to ecu and injectors had the outer shielding cracked causing intermittent shorts and low voltage b+ codes as well. Who knew that would throw a Baro sensor code lol. Stupid thing, had my whole dash apart looking for it! I win in the end though! I'm back up and running strong again!


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    2001A41.8TQM Cat delete, 3"exhaust Turbonetics T3/T4 .63 A/R@18PSI, ATP Exhaust manifold, precision Turbo 39mm wastegate, Forge Splitter, FMIC, 80mm TB, SEM Motorsports Intake, AEB ported/polished, 3 angle valve seats with Supertech inconel exhaust valves/SS Intake, upgraded valve springs/ TI retainers, ARP head stud/main bearing stud kit, Skat rods/stock pistons, solid motor mounts, race density trans/snub/diff carrier mounts, stage 4 clutch with SM12lb flywheel, tuning by Motoza Performance
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