Cruise Control System - Diagnostics: Pre-Check

DIAGNOSIS SYSTEM
1. Check the indicator.
  1. Turn the ignition switch 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: Identifying Cruise Control Indicator And Location
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  HINT:
  
  If the indicator check result is not normal, proceed to troubleshooting for the combination meter (see COMBINATION METER ).
2. Check the DTC.
  HINT:
  
  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 DTC.
  
  Fig 2: Identifying Indicator Light Blinking Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Output of DTC using diagnosis check wire.
  1. Turn the ignition switch ON.
  2. Using SST, connect terminals Tc and CG of DLC3. SST 09843-18040
  3. Read the DTC on the CRUISE MAIN indicator light.
    
    Fig 3: Identifying Terminals Tc And CG Of DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
HINT:
- 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 the illustration.
  
  Fig 4: Identifying Blinking Patterns For Codes ; Normal, 11 And 21
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
USING 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.
  
  Fig 5: Connecting Hand-Held Tester To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
HINT:

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.
DTC CLEARANCE (ERASE MODE)
HINT:

During in the erase mode, diag. detection does not work.
1. Drive at about 15 km/h or below.
2. Using SST, connect terminals Tc and CG of DLC3. SST 09843-18040
3. Push the cruise control switch to CANCEL.
4. On the above mentioned condition, turn on the cruise control main switch 5 times within 3 seconds.
  
  Fig 6: Identifying Terminals Tc And CG Of DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
PROBLEM SYMPTOM CHECK (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.
  4. After releasing the switch, check that the vehicle cruises at the desired speed.
    
    Fig 7: Inspecting SET Switch
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 increases while the control switch is pushed to RES/ACC, and that the vehicle cruises at the set speed when the switch is released.
  4. Momentarily raise the control switch push to the RES/ACC position and then immediately release it. Check that the vehicle speed increases by approx. 1.5 km/h (Tap-up function).
    
    Fig 8: Inspecting ACCEL Switch
    Courtesy 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 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 push the control switch down to SET/COAST, and then immediately release it. Check that the vehicle speed decreases by about 1.5 km/h (Tap-down function).
    
    Fig 9: Inspecting COAST Switch
    Courtesy 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 following operations, 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
    - Push the main switch OFF
    - Push the cruise control switch to CANCEL
      
      Fig 10: Inspecting CANCEL Switch
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 operations 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
    - Push the main switch OFF
    - Push the cruise control switch to CANCEL
  4. After the control switch is pushed 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 11: Inspecting RESUME Switch
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INPUT SIGNAL CHECK
HINT:
1. For check No.1 Ω No.3:
  Turn ignition switch ON.
2. For check No.4:
- Jack up the vehicle.
- Start the engine.
- Shift to D position.
  
  Fig 12: Checking Input Signal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Push the control switch to SET/COAST or RES/ACC position and hold it down or up.
2. Push the main switch ON.
3. Check that the CRUISE MAIN indicator light blinks twice or 3 times repeatedly after 3 seconds.
4. Push the SET/COAST or RES/ACC switch OFF.
5. Operate each switch as listed in Fig 13 .
6. Read the blinking pattern of the CRUISE MAIN indicator light.
7. After performing the check, turn the main switch OFF.
HINT:

When 2 or more signals are input to the ECU, the lowest numbered code will be displayed 1st.

Fig 13: Cruise Main Indicator Light Blinking Pattern Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002