Check Bus 2 Line for Short to GND [12/2021 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 3 CAN JUNCTION CONNECTOR)

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

Disconnect the No. 3 CAN junction connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to No. 3 CAN Junction Connector)	*b	to Central Gateway ECU (Network Gateway ECU)
*c	to Inverter with Converter Assembly	*d	to ECM
*e	to Inverter with Converter Assembly	*f	to Hybrid Vehicle Control ECU Assembly
*g	to Brake Booster with Master Cylinder Assembly (No. 1 Skid Control ECU)	*h	to Vehicle Approaching Speaker Controller
*i	to Battery ECU Assembly (for LITHIUM-ION BATTERY)	*j	Front view of DLC3
*k	to Brake Actuator Assembly (No. 2 Skid Control ECU)	-	-

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
G103-1 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Central gateway ECU (network gateway ECU)
G103-11 (CANL) - G114-4 (CG)		200 Ω or higher	Central gateway ECU (network gateway ECU)
G103-2 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Inverter with converter assembly
G103-12 (CANL) - G114-4 (CG)		200 Ω or higher	Inverter with converter assembly
G103-3 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	ECM
G103-13 (CANL) - G114-4 (CG)		200 Ω or higher	ECM
G103-4 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Inverter with converter assembly
G103-14 (CANL) - G114-4 (CG)		200 Ω or higher	Inverter with converter assembly
G103-5 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Hybrid vehicle control ECU assembly
G103-15 (CANL) - G114-4 (CG)		200 Ω or higher	Hybrid vehicle control ECU assembly
G103-6 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Brake booster with master cylinder assembly (No. 1 skid control ECU)
G103-16 (CANL) - G114-4 (CG)		200 Ω or higher
G103-7 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Brake actuator assembly (No. 2 skid control ECU)
G103-17 (CANL) - G114-4 (CG)		200 Ω or higher	Brake actuator assembly (No. 2 skid control ECU)
G103-8 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Vehicle approaching speaker controller
G103-18 (CANL) - G114-4 (CG)		200 Ω or higher	Vehicle approaching speaker controller
G103-10 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Battery ECU assembly*
G103-20 (CANL) - G114-4 (CG)		200 Ω or higher	Battery ECU assembly*

*: for LITHIUM-ION BATTERY

Result

Result	Proceed to
OK	A
NG (Central gateway ECU [network gateway ECU] CAN main wire)	B
NG (Wire to ECU or sensor)	C

Result:

REPLACE NO. 3 CAN JUNCTION CONNECTOR

Result:

See step 3

Result:

See step 2

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 3 CAN JUNCTION CONNECTOR)

Reconnect the G103 No. 3 CAN junction connector.

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Central Gateway ECU [Network Gateway ECU])
*b	Front view of DLC3

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
G72-18 (CA4H) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
G72-17 (CA4L) - G114-4 (CG)		200 Ω or higher

Result

Proceed to
OK
NG

Result:

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

Refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Result:

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 3 CAN JUNCTION CONNECTOR)

CHECK FOR SHORT TO GND IN CAN BUS WIRE (ECU OR SENSOR)

Reconnect all wire harness connectors.

Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus line shorted to GND is connected.

*a	Component with harness connected (Central Gateway ECU [Network Gateway ECU])
*b	Front view of DLC3

Refer to TERMINALS OF ECU [12/2021 - 10/2022] , or refer to TERMINALS OF ECU [10/2022 - 10/2023] , or refer to TERMINALS OF ECU [10/2023 - ]

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
G72-18 (CA4H) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
G72-17 (CA4L) - G114-4 (CG)		200 Ω or higher

HINT:

If the resistance changes to 200 Ω or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short to GND in the wire harness and repair or replace the wire harness or connector if necessary.

Result

Proceed to
OK
NG

Result:

REPLACE ECU OR SENSOR

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR