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Thread: ECU Fault Codes

  1. #1
    Administrator Ted / AF1 Racing's Avatar
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    ECU Fault Codes

    To display fault codes:
    1) Remove right side panel (the piece that covers the rear subframe and lower gas tank) by removing the two 4mm button-head Allen bolts. Be careful of the plastic tabs on the backside of the panels.
    2) You will find two unconnected wires near a big harness clip near the side of the battery. You cannot miss these wires. They are the only 2 unconnected wires in there.
    3) Connect the two wires together.
    4) Turn key switch to "ON/RUN".
    5) DO NOT start or attempt to start engine.
    6) The message "DIAG" should appear on left LCD screen along with a number indicating the Fault Code.
    7) We strongly recommend paying your Aprilia dealer do all of this.

    Component Fault Code Possible Cause
    Camshaft position sensor 11 Sensor not connected. Sensor broken.
    Wiring faulty.
    Crankshaft position sensor 12
    Intake pressure sensor 13
    Intake pressure sensor 14 Excessive pressure difference between two pressure sensors
    Throttle position sensor 15 Sensor not connected. Sensor broken.
    Wiring faulty.
    Coolant temperature sensor 21
    Air temperature sensor 22
    Atmospheric pressure sensor (inside ECU) 23 Sensor faulty
    Ignition coil 1, Front cylinder 33 Ignition coil faulty or wiring not connected
    Ignition coil 2, Front cylinder 34
    Ignition coils 1 and 2, Front cylinder 33,34
    Ignition coil 1, Rear cylinder 35
    Ignition coil 2, Rear cylinder 36
    Ignition coils 1 and 2, Rear cylinder 35,36
    Fall Sensor (tip-over sensor) 41 Sensor not connected. Sensor broken.
    Wiring faulty.

  2. #2
    apriliaforum newb
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    Mine says diag 1. What does that mean?

  3. #3
    apriliaforum Member
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    South wales
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    Quote Originally Posted by Damien Silva View Post
    Mine says diag 1. What does that mean?
    Pretty sure thats the tps reading which should be zero easy to do just search for tps adjustment

  4. #4
    apriliaforum newb
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    Ohio
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    What if it was EFI. No EFI codes under normal riding tho

  5. #5
    apriliaforum newb
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    Aug 2017
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    Ohio
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    How about EFI but only while in diagnose mode?

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