Toyota Sienna Service Manual: Open in One Side of CAN Branch Line

Toyota Sienna Service Manual / Can communication / Can communication system / Fail-safe chart / Open in One Side of CAN Branch Line

DESCRIPTION

If 2 or more ECUs and/or sensors do not appear on the intelligent tester "Communication Bus Check" screen, one side of the CAN branch wire may be open. (One side of the CAN-H [branch wire] / CAN-L [branch wire] of the ECU and/or sensor is open.)

Symptom	Trouble Area
2 or more ECUs and/or sensors do not appear on the intelligent tester "Communication Bus Check" screen.	One side of the CAN branch wire is open Skid control ECU Steering angle sensor Yaw rate sensor Distance control ECU

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

Turn the ignition switch off before measuring the resistances of CAN bus main wires and CAN bus branch wires.
After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches, or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

HINT: Perform the following inspection for the ECUs (sensors) which are not displayed on the intelligent tester. If the malfunction cannot be identified, then perform the following inspections for the ECUs (sensors) connected to CAN communication.

1 CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE

Confirm the systems (ECUs and sensors), which use CAN communication, equipped on the vehicle. (See page CA-17)
Using the intelligent tester, select and perform "Communication Bus Check". (See page CA-17) [*1]
Disconnect the connectors from the ECUs or sensors that are not displayed on the screen. [*2]
Check that only the ECUs and sensors from which the connectors were disconnected in the previous step are not displayed on the "Communication Bus Check" screen. [*3]

HINT: If any ECUs or sensors, other than those from which the connectors were disconnected in the previous step, are not displayed on the "Communication Bus Check" screen, reconnect the disconnected connectors and repeat the procedures [*1], [*2], and [*3].

(e) Perform the communication stop mode check for the ECUs and sensors which correspond to the disconnected connectors.

GO TO CORRESPONDING COMMUNICATION STOP MODE

Short to GND in CAN Bus Line

DESCRIPTION A short to GND is suspected in the CAN bus wire when the resistance between terminals 4 (CG) and 6 (CANH), or terminals 4 (CG) and 14 (CANL) of the DLC3 is below 200 Ω. ...

Network gateway ECU

COMPONENTS REMOVAL 1. REMOVE FRONT DOOR SCUFF PLATE LH 2. REMOVE COWL SIDE TRIM BOARD LH 3. REMOVE INSTRUMENT PANEL FINISH PANEL LOWER LH (See page IP-6) 4. REMOVE INSTRUMENT PANEL SAFETY PAD ...

Other materials:

Diagnosis system
1. CHECK BATTERY VOLTAGE Standard voltage: 11 to 14 V If the voltage is below 11 V, recharge the battery before proceeding. 2. CHECK DLC3 (a) The ECU uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 f ...

Diagnostic trouble code chart
1. DTC CHECK If a malfunction code is displayed during the DTC check , check the suspected area listed for that code in the table below, and proceed to the appropriate page. DIAGNOSTIC TROUBLE CODE CHART DTC No. Detection Item Suspect Area B1244 Light Se ...

Canceling and resuming the constant speed control
Pulling the lever toward you cancels the constant speed control. The speed setting is also canceled when the brakes are applied. Pushing the lever up resumes the constant speed control. Resuming is available when the vehicle speed is more than approximately 25 mph (40 km/h). ...