C28
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Thread: C28

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    Member Nadimm109's Avatar
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    Hi everybody just quick question I have 2012 M109 it run perfect I have the Fi light on and off for a while and finally I get the code which is C28 Does anybody has an idea what’s that code mean

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    Very Active Member Bering_C_Sparky's Avatar
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    Quote Originally Posted by Nadimm109 View Post
    Hi everybody just quick question I have 2012 M109 it run perfect I have the Fi light on and off for a while and finally I get the code which is C28 Does anybody has an idea what’s that code mean
    Yep its a problem with your Secondary Throttle Valve Actuator.

    Trouble shooting for this is located on page 5-58 - 5-59 in the service manual.

    BCS

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  6. #4
    Very Active Member Bering_C_Sparky's Avatar
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    FI light code key:
    C00: None - No defective part
    C12: Crankshaft position sensor (CKPS) - Pick-up coil signal, Generator
    C13: Intake air pressure sensor #2 (IAPS #2) - For Front cylinder
    C14: Throttle position sensor (TPS) - (Note *1)
    C15: Engine coolant temp. sensor (ECTS)
    C17: Intake air pressure sensor #1 (IAPS #1) - For Rear cylinder
    C21: Intake air temp. sensor (IATS)
    C23: Tip-over sensor (TOS)
    C24: Ignition signal #1 (IG coil #1.1) - For Rear cylinder
    C25: Ignition signal #2 (IG coil #2.1) - For Front cylinder
    C26: Ignition signal #1 (IG coil #1.2) - For Rear cylinder
    C27: Ignition signal #2 (IG coil #2.2) - For Front cylinder
    C28: Secondary throttle valve actuator (STVA)
    C29: Secondary throttle position sensor (STPS) - (Note *2)
    C31: Gear position signal (GP switch)
    C32: Injector signal #1 (FI #1) - For Rear Cylinder
    C33: Injector signal #2 (FI #2) - For Front Cylinder
    C40: Idle speed control valve (ISC valve)
    C41: Fuel pump control system (FP control system) - Fuel Pump, Fuel Pump Relay
    C42: Ignition switch signal (IG switch signal) - Anti-theft
    C44: Heated oxygen sensor #2 (HO2S #2) - For E-02, 19, 24
    C46: Exhaust control valve actuator (EXCVA)
    C49: PAIR control solenoid valve #2 (PAIR valve #2) - Except for E-03, 28, 33
    C60: Cooling fan control system - Cooling fan relay
    C61: PAIR control solenoid valve #1 (PAIR #1)
    C64: Heated oxygen sensor #1 (HO2S #1) - For E-02, 19

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