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Section 141 (Cruise Control System - Diagnosis): Pre-Check

WARNING: This page is about a different car, the 2004 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
  1. DIAGNOSIS SYSTEM 
    1. Description

      ECM controls of the cruise control the function on a vehicle.

      Data stored in the cruise control memory and on the DTC can be read from the DLC3 on the vehicle. If CRUISE MAIN indicator light does not come on after the DTC check, there is a malfunction of the cruise control.

      Use the hand-held tester or SST to check and solve the problem.

    2. Check the DLC3.

      The vehicle's ECM uses ISO 9141-2 for communication. The terminal arrangement of DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.

      Fig 1: Identifying DLC3 Connector Terminals
      G03061428Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      SPECIFIED CONDITION

      Terminal No. Connection/Specified Condition Condition
      4 Chassis Ground <--> Body Ground / 1 <--> or less Always
      7 Bus *** Line / Pulse Generation During Communication
      16 Battery Positive <--> Body Ground / 9 -14 V Always

      HINT:

      If the display shows "UNABLE TO CONNECT TO VEHICLE" after connecting the hand-held tester to the DLC3 and turning the ignition ON, there is a problem either with the vehicle or with the tool.

      • If communication is normal when connecting the tool to another vehicle, inspect the DLC3 on the original vehicle.
      • If communication is still not possible when connecting the tool to another vehicle, the problem is probably in the tool itself. Consult the Service Department listed in the tool's instruction manual.
    3. Check the indicator.
      1. Turn the ignition switch ON.
      2. Check that the CRUISE MAIN indicator light comes on when the main switch button is turned ON, and that the indicator light goes off when the main switch is turned OFF.
      Fig 2: Identifying Cruise Main Indicator Light
      G03061429Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      If there is a problem with the indicator, inspect the cruise main indicator lamp circuit, see CRUISE MAIN INDICATOR LIGHT CIRCUIT .

    4. Check the DTC.

      HINT:

      If a malfunction occurs in the vehicle speed sensors or stop lamp switch assembly, etc. during cruise control driving, the ECM actuates AUTO CANCEL of the cruise control and then the CRUISE MAIN indicator light will start to blink, informing the driver of a malfunction. At the same time, data of the malfunction is stored as a diagnostic trouble code, or DTC.

      Fig 3: Cruise Main Indicator Light Blinking Pattern
      G03061430Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Output of DTC using diagnosis check wire.
      1. Using SST, connect terminals TC and CG of DLC3.

        SST 09843-18040

      2. Turn the ignition switch ON.
      3. Read the DTC on the CRUISE MAIN indicator light.
      Fig 4: Identifying DLC3 Connector Terminals
      G03061431Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      If the DTC is not output, inspect the CRUISE MAIN INDICATOR LIGHT CIRCUIT  and DIAGNOSIS CIRCUIT .

      As an example, the normal blinking pattern and the blinking pattern for code 52 are shown in the illustration.

    Fig 5: Identifying Normal Blinking Pattern And Blinking Pattern For Code 52
    G03061432Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. USING HAND-HELD TESTER 
    1. Connect the hand-held tester to DLC3.
    2. Monitor the ECU data by following the prompts on the tester screen.

    HINT:

    Hand-held tester has a "Snapshot" function which records the monitored data. Refer to the hand-held tester operator's manual for further details.

  3. DATA LIST 

    HINT:

    From the DATA LIST displayed on the hand-held tester, you can read the value of the switch, the sensor and so on without removing parts. Reading the DATA LIST as the first step to troubleshooting is one way to shorten labor time.

    1. Connect the hand-held tester to DLC3.
    2. Turn the ignition switch ON.
    3. According to the display on the tester, read the "DATA LIST".
    DATA LIST

    Item Measurement Item / Display (Range) Normal Condition Diagnostic Note
    VEHICLE SPD Vehicle speed / min.: 0 km/h (0 mph), max.: 255 km/h (158 mph) Actual vehicle speed -
    MEMORY SPD Stored vehicle speed / min.: 36 km/h (22 mph), max.: 200 km/h (124 mph) Actual stored vehicle speed -
    THROTTLE Required throttle opening angle / min.: 0°, max.: 125° Actual required throttle opening -
    CRUISE CONTROL Cruise control system active condition / ON or OFF ON : Cruise control activated OFF : Cruise control inactivated -
    MAIN SW (MAIN) Main SW signal (Main CPU) / ON or OFF ON : Main SW ON (Pushed in) OFF: Main SW OFF (Pushed out) "3"
    MAIN SW (SUB) Main SW signal (Sub CPU) / ON or OFF ON : Main SW ON Pushed in OFF: Main SW OFF Pushed out "3"
    CCS READY M Cruise control system standby condition (Main CPU) / ON or OFF ON - OFF : Change ON/OFF each time Main SW is pushed in. "1"
    CCS READY S Cruise control system standby condition (Sub CPU) / ON or OFF ON - OFF : Change ON/OFF each time Main SW is pushed in. "1"
    CCS INDICATOR M Cruise indicator signal (Main CPU) /ON or OFF ON : "CCS READY" ON OFF : "CCS READY" OFF "2"
    CCS INDICATOR S Cruise indicator signal (Sub CPU) /ON or OFF ON : "CCS READY" ON OFF : "CCS READY" OFF "2"
    CANCEL SW CANCEL SW signal / ON or OFF ON: CANCEL SW ON OFF: CANCEL SW OFF -
    SET/COAST SW -/SET SW signal / ON or OFF ON : -/SET SW ON OFF : -/SET SW OFF -
    RES/ACC SW +/RES SW signal / ON or OFF ON : +/RES SW ON OFF : +/RES SW OFF -
    STP LIGHT SW2 M Stop lamp SW signal (Main CPU) / ON or OFF ON : Brake pedal depressed OFF : Brake pedal released -
    STP LIGHT SW2 S Stop lamp SW signal (Sub CPU) / ON or OFF ON : Brake pedal depressed OFF : Brake pedal released -
    STP LIGHT SW1 S Stop light SW signal (Sub CPU) / ON or OFF ON : Brake pedal depressed OFF : Brake pedal released -
    SHIFT D POS PNP SW signal (D position) / ON or OFF ON : Shift D position OFF : Except shift D position -

    HINT:

    "3" is OK but "1" is NG --> ECM failure

    "1" is OK but "2" is NG --> DTC output or ECM failure

    "3" is OK but cruise indicator does not turn on --> CRUISE MAIN indicator or wire harness or ECM failure

  4. DTC CLEAR 
    1. The following methods will erase the DTCs and freeze frame data.
      1. The hand-held tester can be used to erase the codes.
      2. Disconnecting the battery terminals or EFI No.1 fuse can also erase the codes.
    2. After completing repairs, the DTC retained in the memory can be cleared by removing the EFI No.1 fuse for 1 minute or more with the ignition switch OFF.
    3. Check that the normal code is displayed after connecting the fuse.
  5. PROBLEM SYMPTOM CONFIRMATION (ROAD TEST) 
    1. Inspect the SET switch.
      1. Push the main switch button ON.
      2. Drive at a desired speed (40 km/h (25 mph) or higher).
      3. Push down the control switch to the -/SET position.
      4. After releasing the switch, check that the vehicle cruises at the desired speed.
      Fig 6: Inspecting SET Switch
      G03061433Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Inspect the '+' switch.
      1. Push the main switch button ON.
      2. Drive at a desired speed (40 km/h (25 mph) or higher).
      3. Check that the vehicle speed increases when the control switch is pushed up to +/RES, and that the vehicle cruises at the set speed when the switch is released.
      4. Push the control switch to +/RES, and then immediately release it. Check that the vehicle speed increases by about 1.6 km/h (Tap-up function).
      Fig 7: Inspecting '+' Switch
      G03061434Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Inspect the '-' switch.
      1. Push the main switch button ON.
      2. Drive at a desired speed (40 km/h (25 mph) or higher).
      3. Check that the vehicle speed decreases while the control switch is pushed down to -/SET, and the vehicle cruises at the set speed when the switch is released.
      4. Push the control switch to -/SET, and then immediately release it. Check that the vehicle speed decreases by about 1.6 km/h (Tap-down function).
      Fig 8: Inspecting '-' Switch
      G03061435Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Inspect the CANCEL switch.
      1. Push the main switch button ON.
      2. Drive at a desired speed (40 km/h (25 mph) or higher).
      3. After doing one of the following, check that the cruise control system is cancelled and that the normal driving mode is reset.
        • Depressing the brake pedal.
        • Shift to any gear besides D.
        • Pushing the main switch button OFF.
        • Pulling the control switch CANCEL.
      Fig 9: Inspecting CANCEL Switch
      G03061436Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Inspect the RES switch.
      1. Push the main switch button ON.
      2. Drive at a desired speed (40 km/h (25 mph) or higher).
      3. After doing one of the following, check that the cruise control system is cancelled and that the normal driving mode is reset.
        • Depressing the brake pedal.
        • Shift to any gear besides D.
        • Pulling the control switch CANCEL.
        Fig 10: Inspecting RES Switch
        G03061437Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. After the control switch is pulled up to +/RES at the driving speed of more than 40 km/h (25 mph), check that the vehicle resumes the same speed maintained before the cancellation.
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