Toyota CH-R Service Manual: Open in Bus 3 Main Bus Line

Toyota CH-R Service Manual / Networking / Can Communication System / Open in Bus 3 Main Bus Line

DESCRIPTION

There may be an open circuit in one of the CAN main bus lines when the resistance between terminals 6 (CA3H) and 21 (CA3L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher.

Symptom	Trouble Area
Resistance between terminals 6 (CA3H) and 21 (CA3L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher.	CAN main bus lines or connector Central gateway ECU (network gateway ECU) No. 3 CAN junction connector

This malfunction is not related to the lines of a CAN branch or to ECUs or sensors connected to a CAN branch.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.
Click here
Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
Click here
After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the ignition switch ON and wait at least approximately 60 seconds.
After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.
Click here

HINT:

Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE

1.	CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 3 CAN JUNCTION CONNECTOR)

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Disconnect the No. 3 CAN junction connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition	Connected to
F114-10 (CANH) - F114-21 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	Central gateway ECU (network gateway ECU)
F114-11 (CANH) - F114-22 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	Central gateway ECU (network gateway ECU)

Front view of wire harness connector

(to No. 3 CAN Junction Connector)

to Central Gateway ECU (Network Gateway ECU)

REPLACE NO. 3 CAN JUNCTION CONNECTOR

2.	CHECK FOR OPEN IN CAN MAIN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 3 CAN JUNCTION CONNECTOR)

(a) Reconnect the F114 No. 3 CAN junction connector.

(b) Disconnect the central gateway ECU (network gateway ECU) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F74-6 (CA3H) - F74-19 (CAYH)	Cable disconnected from negative (-) battery terminal	Below 1 Ω
F74-21 (CA3L) - F74-20 (CAYL)	Cable disconnected from negative (-) battery terminal	Below 1 Ω

*a	Front view of wire harness connector (to Central gateway ECU (network gateway ECU))

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 3 CAN JUNCTION CONNECTOR)

Check Bus 2 Line for Short to GND

DESCRIPTION There may be a short circuit between one of the CAN bus lines and GND when there is no resistance between terminal 18 (CA4H) of the central gateway ECU (network gateway ECU) and termi ...

Check Bus 3 Lines for Short Circuit

DESCRIPTION There may be a short circuit between the CAN main bus lines and/or CAN branch lines when the resistance between terminals 6 (CA3H) and 21 (CA3L) of the central gateway ECU (network ga ...

Other materials:

Toyota CH-R Service Manual > Window / Glass: Relay
On-vehicle Inspection ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT DEFOGGER RELAY (a) Check the resistance. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition ...

Toyota CH-R Service Manual > Radiator Grille: Removal
REMOVAL PROCEDURE 1. REMOVE FRONT BUMPER ASSEMBLY (w/o Toyota Safety Sense) Click here 2. REMOVE MILLIMETER WAVE RADAR SENSOR ASSEMBLY (w/ Toyota Safety Sense) Click here 3. REMOVE RADIATOR GRILLE (a) Remove the 2 bolts. (b) ...

Toyota CH-R Service Manual: Open in Bus 3 Main Bus Line

Check Bus 2 Line for Short to GND

Check Bus 3 Lines for Short Circuit

Other materials:

Toyota CH-R Owners Manual

Toyota CH-R Service Manual