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C1311/11 ABS Relay 1 Circuit

Discussion in '2nd Gen Tundras (2007-2013)' started by Smidley, Jul 1, 2025 at 11:30 AM.

  1. Jul 1, 2025 at 11:30 AM
    #1
    Smidley

    Smidley [OP] New Member

    Joined:
    Yesterday
    Member:
    #137279
    Messages:
    1
    Gender:
    Male
    First Name:
    Douglas
    Vehicle:
    2008 Tundra 4WD 5.7
    None
    There is an active fault C1311/11 STORED. Most of the warning lamps are on.

    1) This fault shows to be for: ABS main relay 1 open or shorted. Is this relay marked BRAKE 1 in the engine compartment?
    2) I have two terminals with twelve volts that both carry a load to battery ground and through the harness.
    3) I used a 9 volt battery to energize the coils in "brake 1 & 2" relays, and checked the resistance throught the closed switch. Coils activate & switch has good continuity at 0.7 ohms. Coil resistance at 112.2 on both.
    4) Is there any live data I can use to diagnose this FC?
    5) If the "brake" relays are not ABS 1 or 2, then where are they? Are they integrated? How do I test them?
    6) The two J-case fuses 40 & 50A check good with good supply.
    7) Did have a fault for the SAS. Checked it out and had 12 volt supply, datalink high/low ~2.5 volts, back-probed for signal voltage and was at 0.254mv to full stop left and right. 0.25-4.75 range??? Im not sure if I am testing this correctly, or if this is just a result of an underlying issue. (I'm a Kenworth diesel tech, out of my realm a little)
     
    Last edited: Jul 2, 2025 at 10:41 AM

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