Diagnosis System

DESCRIPTION
The ECU controls the function of cruise control on this vehicle. Data of the cruise control or DTC can be read from DLC3 of the vehicle. When a trouble occurs with cruise control, check that the CRUISE main indicator light does not come on but DTC inspection is performed. Therefore when there seems to be a problem with the cruise control, use the intelligent tester (with CAN VIM) or SST to check and troubleshoot it.

CHECK DLC3

The hybrid vehicle control ECU of the vehicle uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.

Fig 1: Identifying DLC3 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

SPECIFIED CONDITION CHART

Symbols (Terminal No. 1)	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	Power switch is OFF*	54 to 67 Ω
CANH (6) - Battery positive	HIGH-level CAN bus line	Power switch is OFF*	1 MΩ or higher
CANH (6) - CG (4)	HIGH-level CAN bus line	Power switch is OFF*	3 MΩ or higher
CANL (14) - Battery positive	LOW-level CAN bus line	Power switch is OFF*	1 MΩ or higher
CANL (14) - CG (4)	LOW-level CAN bus line	Power switch is OFF*	3 MΩ or higher

NOTE: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, other switches or doors.

If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

HINT:

Connect the cable of the intelligent tester (with CAN VIM) to the DLC3, turn the power switch ON (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.

If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.

Fig 2: Measuring Resistance
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK INDICATOR
1. Turn the power switch ON (IG).
2. Check that the CRUISE main indicator light comes on when the cruise control 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 there is a problem with the indicator light, inspect the CRUISE main indicator light circuit (see CRUISE MAIN INDICATOR LIGHT CIRCUIT ).
  - If a malfunction occurs in the vehicle speed sensor, stop light switch or other related parts while driving with cruise control, and the hybrid vehicle control ECU activates AUTO CANCEL of the cruise control and then the CRUISE main indicator light starts to blink, informing the driver of the malfunction. At the same time, data of the malfunction is stored as a DTC.