Diagnosis System

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: Adjusting Laser Beam Axis
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. 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 the inspection has been completed.
  Fig 2: Diagnosis Function
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 3: Identifying Blinking Pattern Of CRUISE Main Indicator Light
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DESCRIPTION
1. The ECM controls the dynamic laser cruise control system of the vehicle. The data and DTCs relating to the dynamic laser cruise control system can be read from the DLC3 of the vehicle.
  Use the hand-held tester to check and solve the problem.

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: Checking DLC3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DLC3

Symbols (Terminal No.)	Terminal Description	Condition	Specified Condition
SIL(7) - SG (5)	Bus "+" line	During transmission	Pulse generation
CG(4) - Body ground	Chassis ground	Always	Below 1 Ω
SG(5) - Body ground	Signal ground	Always	Below 1 Ω
BAT(16) - Body ground	Battery positive	Always	11 to 14 V
CANH(6) - CANL (14)	HIGH-level CAN bus line	IG switch OFF	54 to 67 Ω
CANH(6) - Battery positive	HIGH-level CAN bus line	IG switch OFF	1 MΩ or higher
CANH(6) - CG (4)	HIGH-level CAN bus line	IG switch OFF	3 kΩ or higher
CANL(14) - Battery positive	LOW-level CAN bus line	IG switch OFF	1 MΩ or higher
CANL(14) - CG (4)	LOW-level CAN bus line	IG switch OFF	3 kΩ or higher

HINT:

If the display shows a communication error message when you have connected the hand-held tester to the DLC3, turned the ignition switch on (IG) and operated the tester, 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, inspect the DLC3 on the original vehicle.
If communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department listed in the tool's instruction manual.

CHECK THE INDICATOR
1. Turn the ignition switch on (IG).
2. Check that the CRUISE main indicator light and RADAR READY indicator come on when the main switch ON-OFF button is pushed on, and that the indicator light goes off when the ON-OFF button is pushed off.
  HINT:
  
  If the indicator check result shows a problem, proceed to troubleshooting (see CRUISE MAIN INDICATOR LIGHT CIRCUIT ) for the combination meter section.
  
  Fig 5: Checking CRUISE Main Indicator Light And RADAR READY Indicator Come On
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  
  If a malfunction occurs in the vehicle speed sensors, the stop light switch, or other related parts during cruise control driving, the ECU actuates AUTO CANCEL of the cruise control and blinks the CRUISE main indicator light. During constant speed control, the master warning light blinks. During vehicle-to-vehicle distance control, the master warning light comes on. This indicator light informs the driver of the malfunction. At the same time, the malfunction is stored as a diagnostic trouble code.
  
  Fig 6: CRUISE Main Indicator Light Blinking Pattern (1 Of 2)
  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 light 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 7: CRUISE Main Indicator Light Blinking Pattern (2 Of 2)
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 8: Connecting Terminals TC And CG Of DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Turn the ignition switch on (IG).
  3. Read the DTCs on the CRUISE main indicator light.
    HINT:
    
    If the DTCs are not indicated, inspect the CRUISE main indicator light circuit (See CRUISE MAIN INDICATOR LIGHT CIRCUIT ) and the diagnosis circuit (See DIAGNOSIS CIRCUIT ).
    
    For example, the blinking patterns of normal code and code 52 are shown in Fig 9 .
  Fig 9: Example Of Blinking Pattern Of 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 ECU-IG No.2 fuse for 1 minute or more.
  3. Connect the battery terminal or ECU-IG No.2 fuse, and then turn the ignition switch on (IG).
  4. Check that the normal code is indicated after connecting the fuse.