Dynamic Laser Cruise Control System: Pre-Check

LASER BEAM AXIS ADJUSTMENT
Use the hand-held tester to adjust the optical axis (see ADJUSTMENT for the optical axis adjusting operation).

HINT:

While adjusting the optical axis of the laser radar sensor, the CRUISE main indicator light illuminates and FC is displayed on the multi-information display.

Fig 1: Identifying CRUISE Main Indicator Light
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DIAGNOSIS FUNCTION
1. The diagnosis function makes the master warning light and the multi-information display come on, and the CRUISE main indicator light blinks as shown in the illustration. When a malfunction occurs in the dynamic laser cruise control system, the DTCs are stored in the ECM.
  NOTE:
  - The master warning light goes off if the system returns to normal condition.
  - Since the stored data in the ECM is erased by disconnecting the EFI No.1 fuse or the battery terminal, do not disconnect them until finishing the inspection.
  Fig 2: Identifying CRUISE Main Indicator Light And Master Warning Light
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 3: Identifying Blinking Pattern Of CRUISE MAIN Indicator Light
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DIAGNOSING SYSTEM

Description
The ECM controls the cruise control function and dynamic laser cruise control in a vehicle. Data on the cruise control system, dynamic laser cruise control system and the DTCs can be read from DLC3 in the vehicle. If the CRUISE main indicator light does not come on after the DTC check, there is a malfunction in the cruise control and dynamic laser cruise control system.

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

SST 09843-18040

Check the DLC3.

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

Fig 4: Identifying DLC3 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DLC3 CONNECTOR TERMINALS NO AND CONNECTION CONDITION

Terminal No. (Symbols)	Connection/Specified Condition	Condition
4(CG)	Chassis Ground - Body Ground/1 Ω or less	Always
7(SIL)	Bus (+) Line/Pulse Generation	During Communication
16 (BAT)	Battery Positive - Body Ground/9 to 14 V	Always

HINT: If the display shows "UNABLE TO CONNECT TO VEHICLE" when the hand-held tester is connected to the DLC3 and the ignition switch is ON, there is a problem on either the vehicle side or the tool side.

If communication is normal when the tool is connected to another vehicle, check the DLC3 in the original vehicle.
If communication is still not possible when the tool is connected to another vehicle, the problem is probably in the tool itself. Consult with the Service Department listed in the Tool's Instruction Manual.

Check the indicator.
1. Turn the ignition switch to the ON position.
2. Check that the master warning light and READY indicator light come on.
3. Check that the master warning light and READY indicator light go off after approx. 3 seconds.
  HINT:
  
  If the indicator check result shows problem, proceed to troubleshooting (See COMBINATION METER ).
  
  Fig 5: Identifying Master Warning Light And READY Indicator Light
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DTC CHECK (USING SST CHECK WIRE)
HINT:

If a malfunction occurs in the vehicle speed sensors or the stop lamp switch, etc. during cruise control driving, the ECU actuates AUTO CANCEL of the cruise control and blinks the CRUISE main indicator light. This indicator light informs the driver of a malfunction. At the same time, the malfunction is stored as a diagnostic trouble code.

Fig 6: Identifying Blinking Pattern Of CRUISE MAIN Indicator Light
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Checking for DTCs.
  1. Using SST check wire, connect terminals TC and CG of the DLC3.
    SST 09843-18040
    
    Fig 7: Identifying Connect Terminals TC And CG Of DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Turn the ignition switch to the ON position.
  3. Read the DTCs on the CRUISE main indicator light.
    HINT:
    
    If the DTCs are not indicated, inspect the CRUISE MAIN INDICATOR LIGHT CIRCUIT and the DIAGNOSIS CIRCUIT .
    
    For example, the blinking patterns of normal code and code 52 are shown in the illustration.
    
    Fig 8: Identifying Blinking Pattern Of CRUISE MAIN Indicator Light (Normal Code And Code 52)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Clearing the DTCs.
  1. Turn the ignition switch OFF.
  2. Disconnect the battery terminals or EFI No.1 fuse for 1 minute or more.
  3. Connect the battery terminal or EFI No.1 fuse, and then turn the ignition switch to the ON position.
  4. Check that the normal code is indicated after connecting the fuse.
DTC CHECK (USING HAND-HELD TESTER)
1. Checking for DTCs.
  1. Connect the hand-held tester to the DLC3.
  2. Turn the ignition switch to the ON position.
  3. Read the DTCs by following the prompts on the tester screen.
    HINT:
    
    The hand-held tester has the "Snapshot" function which records the monitored data.
    
    Refer to the hand-held tester operator's manual for further details.
2. Clearing the DTCs.
  1. Connect the hand-held tester to the DLC3.
  2. Turn the ignition switch to the ON position.
  3. Clear the DTCs following the prompts on the tester screen.
    HINT:
    
    Refer to the hand-held tester operator's manual for further details.
AUTO CANCEL FUNCTION (FAIL-SAFE FUNCTION)
HINT:

If a system malfunction occurs, the applicable DTCs will appear on the multi-information display.
1. The CRUISE main indicator light keeps blinking until the main switch is turned off, the master warning light comes on with the warning sound "Pop", and the display shows "E3". The cruise control operation is suspended until turning the main switch ON again. The auto cancel function deletes the stored vehicle speed and cancels the cruise control operation in the following conditions.
  
  Fig 10: Identifying Blinking Cruise Main Indicator Light (E3)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. When the vehicle speed signal malfunctions.
  2. When the electronic throttle parts malfunction.
  3. When the stop lamp switch has an open or short circuit.
  4. When the laser radar sensor malfunctions. (*1)
  5. When the light axis of the laser radar sensor is off position. (*1)
    *1: Only in the vehicle-to-vehicle distance control mode.
2. The CRUISE main indicator light blinks, the master warning light comes on with the warning sound "Pop", and the display shows "E2". The cruise control operation is suspended until the canceling condition is resolved (in the vehicle-to-vehicle distance control mode only). The auto cancel function cancels the cruise control operation in the following conditions.
  1. When the wipers (Hi, Lo) operate (including the auto wiper).
  2. When the pattern select switch is in the "SNOW" mode.
  3. When the laser radar sensor receives strong light, such as sunlight, from the front side.
  4. When the vehicle-to-vehicle distance measurement is extremely unstable because of bad weather.
    
    Fig 11: Identifying Cruise Main Indicator Light Blinks, Master Warning Light (E2)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. The auto cancel function cancels the cruise control operation in the following conditions. At this time, the CRUISE main indicator light blinks, the master warning light comes on with the warning sound "Pop" and the display shows "E1". The cruise control operation is suspended until the canceling condition is resolved (in the vehicle-to-vehicle distance control mode only).
  1. When the laser radar sensor has dirt on it.
    HINT:
    
    While the dynamic laser cruise control is operated, the ECM outputs a malfunction code for 0.15 sec. or more when it detects dirt.
    
    Fig 12: Identifying Cruise Main Indicator Light Blinks, Master Warning Light (E3)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DATA LIST
HINT:

From the DATA LIST displayed on the hand-held tester, you can read the value of components such as the switch, sensor, and actuator without parts removal. Reading the DATA LIST as the first step of troubleshooting is one way to shorten labor time.
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch to the ON position.
3. According to the display on the tester, read the "DATA LIST".
  ECM:
  
  Fig 13: Data List Chart - ECM (1 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 14: Data List Chart - ECM (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

ACTIVE TEST

HINT:

Performing the ACTIVE TEST using the hand-held tester allows components such as the relay, VSV, and actuator to operate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one way to shorten labor time.

It is possible to display the DATA LIST during the ACTIVE TEST.

Connect the hand-held tester to the DLC3.
Turn the ignition switch to the ON position.

According to the display on the tester, perform the "ACTIVE TEST".

HINT:

The ignition switch must be turned to the ON position to proceed Active Test using a hand-held tester.

SKID CONTROL ECU:

ACTIVE TEST DETAIL (SKID CONTROL ECU)

Item	Vehicle Condition/Test Details	Diagnostic Note
VSC/BR WARN BUZ	Turns skid control buzzer ON/OFF	Buzzer can be heard

COMBINATION METER ASSY:

ACTIVE TEST DETAIL (COMBINATION METER ASSY)

Item	Vehicle Condition/Test Details	Diagnostic Note
CRUISE INDIC	"CRUISE" indicator is ON/OFF	-
L-CRUISE DISP	"Multi-information display" is ON/OFF	-
L-CRS CHECK IND	"Master warning light" is ON/OFF	-
L-CRS READY IND	"READY" indicator light is ON/OFF	-
L-CRS NORMAL	"NORM." indicator light is ON/OFF	-

PROBLEM SYMPTOM CONFIRMATION (ROAD TEST)
1. Inspect the SET function.
  1. Push the ON-OFF button on.
  2. Drive at a desired speed (40 km/h (25 mph) or higher).
  3. Push the cruise control main switch to -/SET.
  4. After releasing the switch, check that the vehicle cruises at the desired speed.
2. Inspect the + (ACCEL) switch.
  1. Push the ON-OFF button on.
  2. Drive at the desired speed (40 km/h (25 mph) or higher).
  3. Check that the vehicle speed increases while the cruise control main switch is pushed to +/RES, and that the vehicle cruises at the set speed when the switch is released.
  4. Momentarily push the cruise control main switch to +/RES and then immediately release it. Check that the vehicle speed increases by about 1.6 km/h (1.0 mph) (Tap-up function).
    HINT:
    
    Tap-up/Tap-down function can be used only in the Fixed-Speed Control Mode.
3. Inspect the - (COAST) function.
  1. Push the ON-OFF button on.
  2. Drive at a desired speed (40 km/h (25 mph) or higher).
  3. Check that the vehicle speed decreases while the cruise control main switch is pushed to -/SET, and the vehicle cruises at the set speed when the switch is released.
  4. Momentarily push the cruise control main switch to -/SET, and then immediately release it. Check that the vehicle speed decreases by about 1.6 km/h (1.0 mph) (Tap-down function).
    HINT:
    
    Tap-up/Tap-down function can be used only in the Fixed-Speed Control Mode.
4. Inspect the CANCEL function.
  1. Push the ON-OFF button 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
    - Adjust the shift lever to any position except D
    - Push the ON-OFF button off
    - Pull the cruise control main switch to CANCEL
5. Inspect the RES (RESUME) function.
  1. Push the ON-OFF button 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
    - Adjust the shift lever to any position except D
    - Pull the cruise control main switch to CANCEL
    Fig 19: Inspecting RES (RESUME) Function
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. After pushing the cruise control main switch to +/RES at the driving speed of more than 40 km/h (25 mph), check that the vehicle restores the speed prior to the cancellation.
    HINT:
    
    RESUME (in the Vehicle-to-vehicle Distance Control Mode only.)
    
    The stored vehicle speed is retained even if the vehicle speed becomes less than 40 km/h (25 mph) once. The previously stored vehicle speed can be resumed by pushing the cruise control main switch to +/RES when vehicle speed returned to approximately 40 km/h (25 mph) or more.
INPUT SIGNAL CHECK (Using hand-held tester)
1. Connect the hand-held tester to the DLC3.
2. Check the cruise control main switch using the DATA LIST function in the hand-held tester (MAIN, CANCEL, -/SET, +/RES, MODE).
  
  Fig 21: Identifying Cruise Control Main Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT MODE SWITCH
1. Turn the ignition switch to the ON position.
  HINT:
  
  Dynamic laser cruise is default mode.
  
  Fig 22: Inspecting Mode Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. After pushing the ON-OFF button on, push the cruise control main switch to MODE for at least 1 second without any other control. Make sure that "NORM." is indicated and no indication is shown in the display.
  NOTE: When performing other operations (setting) after pushing the ON-OFF button on, the system cancels the constant speed control mode and cannot return to the mode again.
  
  HINT:
  
  If the system cannot switch to the constant speed control mode, push the ON-OFF button off once, and perform the same procedures as shown above. If a malfunction is still detected in the system, and then start the engine again and perform the above procedure.
  
  Fig 23: Identifying CRUISE MAIN Indicator Light And NORM Indicator Light
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT STEERING PAD SWITCH ASSY
1. Turn the ignition switch to the ON position.
2. Push on the ON-OFF button of the cruise control main switch.
3. Push on the distance control switch of the steering pad switch.
4. Check that the indication of distance between vehicles, which are shown on the multi-information display of the combination meter, changes from "LONG", "MIDDLE" to "SHORT" in order.
  HINT:
  
  The indication is immediately set to "LONG" each time the engine is started.