Cruise Control System - Diagnostics: Pre-Check

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.
  NOTE:
  If the indicator check result is not normal, proceed to troubleshooting (See PROBLEM SYMPTOMS TABLE ) for the combination meter section.
2. Check the DTC.
  NOTE:
  If a malfunction occurs in the No. 1 vehicle speed sensors 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: View Of Cruise Main Indicator Light Malfunction
  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 E₁ of DLC1.
    SST 09843-18020
  3. Read the DTC on the CRUISE MAIN indicator light.
NOTE:
- If the DTC is not output, inspect the (See DIAGNOSIS CIRCUIT ).
- As an example, the blinking patterns for codes; normal, 11 and 21 are shown in Fig 4.
Fig 4: Identifying Blinking Patterns For Codes
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DTC CLEARANCE (ERASE MODE)
NOTE:
Under the erase mode, diag detection does not work.
1. Drive at about 15 km/h or below.
2. Using SST, connect terminals Tc and E₁ of DLC1.
  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.
PROBLEM SYMPTOM CONFIRMATION (ROAD TEST)
1. Inspect the SET switch.
  
  Fig 6: Inspecting SET Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Push the main switch ON.
  2. Drive at a desired speed (40 km/h (25 mph) or higher).
  3. Pull the control switch to the SET/COAST.
  4. After releasing the switch, check that the vehicle cruises at the desired speed.
2. Inspect the ACCEL switch.
  
  Fig 7: Inspecting ACCEL Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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 turned to RES/ACC, and that the vehicle cruises at the set speed when the switch is released.
  4. Momentarily pull the control switch upward to RES/ ACC and then immediately release it. Check that the vehicle speed increases by about 1.5 km/h (Tap-up function).
3. Inspect the COAST switch.
  
  Fig 8: Inspecting COAST Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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 pull the control switch downward to SET/COAST, and then immediately release it. Check that the vehicle speed decreases by about 1.5 km/h (Tap-down function).
4. Inspect the CANCEL switch.
  
  Fig 9: Inspecting CANCEL Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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.
    - Depress the brake pedal
    - Depress the clutch pedal (M/T)
    - Shift to except D position (A/T)
    - Push the main switch OFF
    - Pull the cruise control switch to CANCEL
5. Inspect the RESUME switch.
  
  Fig 10: Inspecting RESUME Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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.
    - Depress the brake pedal
    - Depress the clutch pedal (M/T)
    - Shift to except D position (A/T)
    - Push the main switch OFF
    - 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.
INPUT SIGNAL CHECK
NOTE:
1. For check No.1 - No. 3
  - Turn ignition switch ON.
2. For check No. 4
  - Jack up the vehicle.
  - Start the engine.
  - Shift to D position.
1. Pull 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.
  
  Fig 11: Checking Input Signal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Operate each switch as listed in the table below.
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 Main Indicator Light Blinking Pattern
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002