Diagnosis System

WARNING: This page is about a different car, the 2006 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

DESCRIPTION
The ECU controls the cruise control system of the vehicle. The data and DTCs relating to the cruise control system can be read from the DLC3 of the vehicle. If either DTC is not displayed when checking for DTCs, there may be a problem with the combination meter or the CAN communication and multiplex communication system. Use the intelligent tester to check and solve the problem.

CHECK 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 1: Identifying Terminals Of DLC3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DLC3 REFERENCE CHART

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	Ignition switch off	54 to 67 Ω
CANH(6) - Body ground	HIGH-level CAN bus line	Ignition switch off	1MΩ or higher
CANH(6) - CG(4)	HIGH-level CAN bus line	Ignition switch off	3kΩ or higher
CANL(14) - Body ground	LOW-level CAN bus line	Ignition switch off	1MΩ or higher
CANL(14) - CG(4)	LOW-level CAN bus line	Ignition switch off	3kΩ or higher

HINT:

If the display shows a communication error message when you have connected the intelligent tester to the DLC3, turned the ignition switch to the on (IG) position 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 anther 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 INDICATOR
1. Turn the ignition switch on (IG).
  
  Fig 2: Identifying Cruise Main Indicator Light
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check that the CRUISE main indicator light illuminates when the cruise control main switch is turned ON, and that the indicator light turns off when the main switch is turned OFF. If the results are not as specified, inspect the CRUISE main indicator light circuit (See CRUISE MAIN INDICATOR LIGHT CIRCUIT ).
  
  Fig 3: Identifying Cruise Main Indicator Light Blinking Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  - While driving with cruise control, the hybrid vehicle control ECU activates AUTO CANCEL of the cruise control system when a malfunction in one of the following occurs: vehicle speed sensors, stop light switch or other related parts. When AUTO CANCEL is activated, the CRUISE main indicator light outputs the blinking pattern shown in Fig 3. At the same time, data of the malfunction is stored as a DTC.