Toyota Tacoma (2015-2018) Service Manual: Open in Bus 2 Main Bus Line

Toyota Tacoma (2015-2018) Service Manual / Can Communication / Can Communication System / Open in Bus 2 Main Bus Line

DESCRIPTION

There may be an open circuit in one of the CAN main bus lines and/or a central gateway ECU (network gateway ECU) branch lines when the resistance between terminals 18 (CA4H) and 17 (CA4L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher.

Detection Item	Trouble Area
Resistance between terminals 18 (CA4H) and 17 (CA4L) of central gateway ECU (network gateway ECU) is 70 Ω or higher.	CAN main lines or connector CAN branch lines or connector ECM Combination meter assembly Central gateway ECU (network gateway ECU) No. 1 CAN junction connector No. 2 CAN junction connector

This malfunction is not related to the lines of a CAN branch except the central gateway ECU (network gateway ECU) branch lines or to ECUs or sensors connected to a CAN branch.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

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.
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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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Some parts must be initialized and set when replacing or removing and installing parts.
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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 for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes 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 as normal.
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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 BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
N36-18 (CA4H) - N36-17 (CA4L)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

Text in Illustration

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

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

2.	CHECK FOR OPEN IN CAN BUS LINES (COMBINATION METER ASSEMBLY)

(a) Reconnect the N36 central gateway ECU (network gateway ECU) connector.

(b) Disconnect the combination meter assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C9-1 (CANH) - C9-2 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

Text in Illustration

*a	Front view of wire harness connector (to Combination Meter Assembly)

REPLACE COMBINATION METER ASSEMBLY

3.	CHECK FOR OPEN IN CAN BUS LINES (ECM)

(a) for 2GR-FKS

(1) Reconnect the C9 combination meter assembly connector.

(2) Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
E13-27 (CANH) - E13-35 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

Text in Illustration

*a	Front view of wire harness connector (to ECM)

(b) for 2TR-FE

(1) Reconnect the C9 combination meter assembly connector.

(2) Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
E20-13 (CANH) - E20-14 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

Text in Illustration

*a	Front view of wire harness connector (to ECM)

Result

Result	Proceed to
OK (for 2GR-FKS)	A
OK (for 2TR-FE)	B
NG	C

REPLACE ECM

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

(a) Reconnect the E13*1 or E20*2 ECM connector.

*1: for 2GR-FKS
*2: for 2TR-FE

(b) Disconnect the No. 1 CAN junction connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition	Connect to
J16-2 (CANH) - J16-12 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 2 CAN junction connector
J16-5 (CANH) - J16-15 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	ECM
J16-6 (CANH) - J16-16 (CANL)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω	Central gateway ECU (network gateway ECU)

Text in Illustration

*a	Front view of wire harness connector (to No. 1 CAN Junction Connector)
*b	to No. 2 CAN Junction Connector
*c	to ECM
*d	to Central Gateway ECU (Network Gateway ECU)

Result

Result	Proceed to
OK	A
NG (ECM CAN main line)	B
NG (Central Gateway ECU (Network Gateway ECU) CAN branch line)	C
NG (No. 2 CAN junction connector CAN main line)	D

REPLACE NO. 1 CAN JUNCTION CONNECTOR

REPAIR OR REPLACE CAN MAIN LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - ECM)

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

5.	CHECK FOR OPEN IN CAN BUS LINES (NO. 2 CAN JUNCTION CONNECTOR)

(a) Reconnect the J16 No. 1 CAN junction connector.

(b) Disconnect the No. 2 CAN junction connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition	Connect to
J3-1 (CANH) - J3-11 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 1 CAN junction connector
J3-6 (CANH) - J3-16 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	Combination meter assembly

Text in Illustration

Front view of wire harness connector

(to No. 2 CAN Junction Connector)

to No. 1 CAN Junction Connector

to Combination Meter Assembly

Result

Result	Proceed to
OK	A
NG (Combination meter assembly CAN main line)	B
NG (No. 1 CAN junction connector CAN main line)	C

REPLACE NO. 2 CAN JUNCTION CONNECTOR

REPAIR OR REPLACE CAN MAIN LINE OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

REPAIR OR REPLACE CAN MAIN LINE OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR)

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Check Bus 2 Line for Short to +B

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

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