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Home >> Toyota >> 2008 >> Camry Base, Automatic >> Repair and Diagnosis >> Suspension >> Wheels & Tire System >> Tire & Wheel (Except Hybrid) >> Tire Pressure Warning System >> Diagnosis System

Diagnosis System

  1. CHECK BATTERY VOLTAGE 

    Standard voltage: 

    11 to 14 V 

    If the voltage is below 11 V, recharge the battery before proceeding.

  2. CHECK DLC3 
    1. The ECU uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
      Fig 1: Identifying DLC3 Connector Terminals
      G04828034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      DLC3 CONNECTOR TERMINALS VOLTAGE SPECIFIED CONDITIONS

      Symbols (Terminal NO.) Terminal Description Condition Specified Condition
      SIL (7) - SG (5) Bus "+" line During transmission Pulse generation
      CG (4) - Body ground Chassis ground Always Below 1 Ω
      SG (5) - Body ground Signal ground Always Below 1 Ω
      BAT (16) - Body ground Battery positive Always 11 to 14 V
      CANH (6) - CANL (14) CAN bus line Ignition switch off(1) 54 to 69 Ω
      CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch off(1) 200 Ω or higher
      CANL (14) - CG (4) LOW-level CAN bus line Ignition switch off(1) 200 Ω or higher
      CANH (6) - BAT (16) HIGH-level CAN bus line Ignition switch off(1) 6 kΩ or higher
      CANL (14) - BAT (16) LOW-level CAN bus line Ignition switch off(1) 6 kΩ or higher
      NOTE:
      (1) Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, or any other switches or the doors.
    2. If the result is not as specified, DLC3 may have a malfunction. Repair or replace the harness and connector.

      HINT:

      Connect the cable of Techstream to DLC3, turn the ignition switch on (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.

      • If communication is normal when the tester is connected to another vehicle, inspect DLC3 of the original vehicle.
      • If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.
  3. DIAGNOSIS SYSTEM 
    1. DTCs (Normal mode)
      1. DTCs are memorized in the tire pressure warning ECU and read by the tire pressure warning light blinking or by using Techstream (See DTC CHECK / CLEAR  ).
    2. Test mode
      1. By switching from normal mode into test mode (input signal check), you can inspect the tire pressure warning antenna and receiver, each tire pressure warning valve and transmitter, and vehicle speed sensor (See TEST MODE PROCEDURE  ).
  4. CHECK WARNING LIGHT 
    1. Turn the ignition switch on (IG).
    2. Check that the tire pressure warning light illuminates for 3 seconds.

      If the warning check result is not normal, proceed to the troubleshooting for the tire pressure warning light circuit.

      Fig 2: Identifying Tire Pressure Warning Light
      G04977834Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TROUBLESHOOTING CHART

      Trouble Area See procedure
      Tire pressure warning light circuit TIRE PRESSURE WARNING LIGHT CIRCUIT 
  5. TIRE PRESSURE WARNING LIGHT AND INDICATOR CHART 

    HINT:

    The table below indicates the state of the tire pressure warning light and indicator after the ignition switch is turned on (IG).

    TIRE PRESSURE WARNING LIGHT AND INDICATOR CHART

      Immediately after turning the ignition switch on (IG) Always
    Warning light output pattern
    Comes on for 3 sec. Goes off Comes on Blinks ((1)) Blinks ((2)) Blinks ((3)) Blinks ((4)) Outputs DTC
    Normal ◦ ◦ - - - - - -
    Low tire pressure ◦ - ◦ - - - - -
    System fail ◦ - - ◦ - - - -
    Test mode ◦ - - - ◦ - - -
    Initialization ◦ - - - - ◦ - -
    ECU connector poorly connected - - - ◦ - - - -
    TC ground (DTC is output) ◦ - - - - - - ◦
    TC ground (DTC is not output) ◦ - - - - - ◦ -
    (1) Comes on and goes off repeatedly at 0.5 second intervals, and comes on after 1 minute.
    (2) Comes on and goes off repeatedly at 0.125 second intervals.
    (3) Blinks 3 times (1 second on, 1 second off).
    (4) Comes on and goes off repeatedly at 0.25 seconds intervals.
    Fig 3: Tire Pressure Warning Light Blinking Pattern - 0.5-Second Interval
    G04944289Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Tire Pressure Warning Light Blinking Pattern - 0.125 Second Interval
    G04944290Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 5: Tire Pressure Warning Light Blinking Pattern - 1 Second Interval
    G04944291Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 6: Tire Pressure Warning Light Blinking Pattern - 0.25 Second Interval
    G04944292Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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