CAN COMMUNICATION SYSTEM(w/ Central Gateway ECU) Open in Bus 5 Main Bus Line

DTC Code	DTC Name
	Open in Bus 5 Main Bus Line

DESCRIPTION

There may be an open circuit in one of the CAN main bus lines when the resistance between terminals 15 (CA5H) and 16 (CA5L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher.


Symptom	Trouble Area
Resistance between terminals 15 (CA5H) and 16 (CA5L) 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. 1 CAN junction connector No. 16 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

Note:

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.
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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.
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After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the ignition switch to ON and wait at least 20 seconds, and then drive the vehicle at a speed of 5 km/h (3 mph) or more for 83 seconds or more.
After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed.
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Tip:

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

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

Disconnect the cable from the negative (-) battery terminal.
Disconnect the A32 No. 1 CAN junction connector.

*a	Front view of wire harness connector (to No. 1 CAN Junction Connector)
*b	to Central Gateway ECU (Network Gateway ECU)
*c	to No. 16 Junction Connector

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

Standard Resistance


Tester Connection	Condition	Specified Condition	Connected to
A32-10 (CANH) - A32-21 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	Central gateway ECU (network gateway ECU)
A32-11 (CANH) - A32-22 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 16 junction connector

Result


Result	Proceed to
OK	A
NG (Line to central gateway ECU (network gateway ECU))	B
NG (Line to No. 16 junction connector)	C

A

REPLACE NO. 1 CAN JUNCTION CONNECTOR

C

CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 16 JUNCTION CONNECTOR)Click here

B

CHECK FOR OPEN IN CAN MAIN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 1 CAN JUNCTION CONNECTOR)

Reconnect the A32 No. 1 CAN junction connector.
Disconnect the E139 central gateway ECU (network gateway ECU) connector.

*a	Front view of wire harness connector (to Central Gateway ECU (Network Gateway ECU))

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

Standard Resistance


Tester Connection	Condition	Specified Condition
E139-15 (CA5H) - E139-9 (CAXH)	Cable disconnected from negative (-) battery terminal	Below 1 Ω
E139-16 (CA5L) - E139-24 (CAXL)	Cable disconnected from negative (-) battery terminal	Below 1 Ω

Result


Result
OK
NG

OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

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NG

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 1 CAN JUNCTION CONNECTOR)

CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 16 JUNCTION CONNECTOR)

Reconnect the A32 No. 1 CAN junction connector.
Disconnect the E140 No. 16 junction connector.

*a	Front view of wire harness connector (to No. 16 Junction Connector)
*b	to No. 1 CAN Junction Connector
*c	to Central Gateway ECU (Network Gateway ECU)

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

Standard Resistance


Tester Connection	Condition	Specified Condition	Connected to
E140-2 (CANH) - E140-13 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 1 CAN junction connector
E140-3 (CANH) - E140-14 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	Central gateway ECU (network gateway ECU)

Result


Result	Proceed to
OK	A
NG (Line to No. 1 CAN junction connector)	B
NG (Line to central gateway ECU (network gateway ECU))	C

A

REPLACE NO. 16 JUNCTION CONNECTOR

B

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 16 JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR)

C

CHECK FOR OPEN IN CAN MAIN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 16 JUNCTION CONNECTOR)

Reconnect the E140 No. 16 junction connector.
Disconnect the E139 central gateway ECU (network gateway ECU) connector.

*a	Front view of wire harness connector (to Central Gateway ECU (Network Gateway ECU))

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

Standard Resistance


Tester Connection	Condition	Specified Condition
E139-15 (CA5H) - E139-9 (CAXH)	Cable disconnected from negative (-) battery terminal	Below 1 Ω
E139-16 (CA5L) - E139-24 (CAXL)	Cable disconnected from negative (-) battery terminal	Below 1 Ω

Result


Result
OK
NG

OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

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NG

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 16 JUNCTION CONNECTOR)