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Cruise Control System - Diagnostics: Pre-Check

  1. PRE-CHECK 
    1. Check that the cruise control actuator assembly, acceleration wire, accelerator auto drive cable assembly, link assembly is installed correctly and that the wire and link are securely connected.
    2. Check that the operating movement of the acceleration pedal, cruise control actuator assembly, acceleration wire, accelerator auto drive cable assembly, link is smooth.
    3. Adjust the acceleration auto drive cable assembly and link system not to allow any play or excessive tension.
    4. Check that the cruise control computer assembly, cruise control actuator assembly, cruise control main switch assembly and connectors of each cancel switch are connected securely.
    5. When turning on the main switch of the cruise control main switch assembly with the ignition switch ON, check that the CRUISE indicator lamp in the accessory meter assembly lights up.
  2. DIAGNOSIS SYSTEM 
    1. Check the indicator.
      1. Turn the ignition switch to ON.
      2. Check that the CRUISE MAIN indicator light comes on when the cruise control main switch is turned on, and that the indicator light goes off when the main switch is turned OFF.
        Fig 1: Locating Cruise Main Indicator Light
        G02828762Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: If the indicator check result is not normal, proceed to troubleshooting. See INDICATORS AND WARNING LIGHT DO NOT LIGHT UP for the combination meter section.
    2. Check the DTC.
      NOTE: If a malfunction occurs in the No. 1 vehicle speed sensor or actuator, etc. during cruise control driving, the ECU actuates AUTO CANCEL of the cruise control and turns ON and OFF the CRUISE MAIN indicator light to inform the driver of a malfunction. At the same time, the malfunction is stored in memory as a diagnostic trouble code.
      Fig 2: Blinking Pattern Of Cruise Main Indicator Light
      G02828763Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Output DTC using diagnosis check wire.
      1. Turn the ignition switch ON.
      2. Using SST, connect terminals Tc and CG of DLC3.
        Fig 3: Identifying DLC3 Connector Terminals
        G02828764Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        SST 09843-18020

      3. Read the DTC on the CRUISE MAIN indicator light.
    NOTE: If the DTC is not output, inspect the diagnosis circuit. See DIAGNOSIS CIRCUIT .

    As an example, the blinking patterns for codes; normal, 11 and 21 are shown in Fig 4.

    Fig 4: Blinking Pattern Of Normal & Malfunction Codes 11 & 21
    G02828765Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. USING TOYOTA HAND-HELD TESTER 
    1. Hook up the hand-held tester to the DLC3.
    2. Monitor the ECU data by following the prompts on the tester screen.
    NOTE: The hand-held tester has a "Snapshot" function which records the monitored data.

    Please refer to the hand-held tester operator's manual for further details.

  4. DTC CLEARANCE (ERASE MODE) 
    NOTE: During in the erase mode, DTC detection does not work.
    1. Drive at about 15 km/h or below.
    2. Using SST, connect terminals Tc and CG of DLC3.
      Fig 5: Identifying DLC3 Connector Terminals & Cruise Control Main Switch
      G02828766Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      SST 09843-18020

    3. Pull the cruise control switch to CANCEL.
    4. On the above mentioned condition, turn on the cruise control main switch 5 times within 3 seconds.
  5. PROBLEM SYMPTOM CONFIRMATION (ROAD TEST) 
    1. Inspect the SET switch.
      1. Push the main switch ON.
      2. Drive at a desired speed (40 km/h (25 MPH) or higher).
      3. Press the control switch to the SET/COAST.
        Fig 6: Identifying Cruise Control Main Switch
        G02828767Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. After releasing the switch, check that the vehicle cruises at the desired speed.
    2. Inspect the ACCEL switch.
      1. Push the main switch ON.
      2. Drive at a desired speed (40 km/h (25 MPH) or higher).
      3. Check that the vehicle speed is increases while the control switch is turned to RES/ACC, and that the vehicle cruises at the set speed when the switch is released.
      4. Momentarily press the control switch upward in the RES/ACC and then immediately release it. Check that the vehicle speed increases by about 1.5 km/h (0.9 MPH) (Tap-up function).
        Fig 7: Identifying Cruise Control Main Switch
        G02828768Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Inspect the COAST switch.
      1. Push the main switch ON.
      2. Drive at a desired speed (40 km/h (25 MPH) or higher).
      3. Check that the vehicle speed is decreases while the control switch is turned to SET/COAST, and the vehicle cruises at the set speed when the switch is released.
      4. Momentarily press the control switch is turned to SET/COAST, and then immediately release it. Check that the vehicle speed decreases by about 1.5 km/h (0.9 MPH) (Tap-down function).
        Fig 8: Identifying Cruise Control Main Switch
        G02828769Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Inspect the CANCEL switch.
      1. Push the main switch ON.
      2. Drive at a desired speed (40 km/h (25 MPH) or higher).
      3. When operating one of the followings, check that the cruise control system is cancelled and that the normal driving mode is reset.
        Fig 9: Identifying Cruise Control Main Switch
        G02828770Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        • Depress the brake pedal
        • Shift to except D position
        • Push the main switch OFF
        • Pull the cruise control switch to CANCEL
    5. Inspect the RESUME switch.
      1. Push the main switch ON.
      2. Drive at a desired speed (40 km/h (25 MPH) or higher).
      3. When operating one of the following, check that the cruise control system is cancelled and that the normal driving mode is reset.
        • Depress the brake pedal
        • Shift to except D position
        • Pull the cruise control switch to CANCEL
      4. After the control switch is turned to RES/ACC at the driving speed of more than 40 km/h (25 MPH), check that the vehicle restores the speed prior to the cancellation.
        Fig 10: Identifying Cruise Control Main Switch
        G02828771Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. INPUT SIGNAL CHECK 
    NOTE:
    • For check No. 1 - 3

      Turn ignition switch ON.

    • For check No. 4

      Jack up the vehicle.

      Start the engine.

      Shift to D position.

    Fig 11: Identifying Cruise Control Main Switch
    G02828772Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Press the control switch to SET/COAST or RES/ACC position and hold it down or hold it up "(1)".
    2. Push the main switch ON "(2)".
    3. Check that the CRUISE MAIN indicator light blinks twice or 3 times repeatedly after 3 seconds.
    4. Turn the SET/COAST or RES/ACC switch OFF.
    5. Operate each switch as listed in Fig 12.
    6. Read the blinking pattern of the CRUISE MAIN indicator light.
    7. After performing the check, turn the main switch OFF.
      NOTE:

      When 2 or more signals are input to the ECU, the lowest numbered code will be displayed first.

    Fig 12: Cruise Control System - Diagnostic Table
    G02828773Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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