Last Modified: 04-05-2023 |
6.11:8.1.0 |
Doc ID: RM1000000018DNB |
Model Year Start: 2018 |
Model: Sienna |
Prod Date Range: [11/2017 -
] |
Title: NETWORKING: CAN COMMUNICATION SYSTEM: Check Bus 3 Lines for Short Circuit; 2018 - 2020 MY Sienna [11/2017 - ] |
Check Bus 3 Lines for Short Circuit
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DESCRIPTION
There may be a short circuit between the bus 3 CAN main wires and/or CAN branch wires when the resistance between terminals 6 (CA3H) and 21 (CA3L) of the central gateway ECU (network gateway ECU) is below 54 Ω.
Detection Item
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Trouble Area
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Resistance between terminals 6 (CA3H) and 21 (CA3L) of central gateway ECU (network gateway ECU) is below 54 Ω.
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-
Short in bus 3 CAN main wires
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Short in bus 3 CAN branch wires
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Central gateway ECU (network gateway ECU)
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Radio and display receiver assembly
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DCM (telematics transceiver)*
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No. 4 junction connector
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-
*: w/ Telematics Transceiver
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
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.
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CHECK FOR SHORT IN CAN BUS WIRE (NO. 4 JUNCTION CONNECTOR)
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(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the No. 4 junction connector.
*a
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Front view of wire harness connector
(to No. 4 junction connector)
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*b
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Central Gateway ECU (Network Gateway ECU)
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*c
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to DCM (Telematics Transceiver)
(w/ Telematics Transceiver)
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*d
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to Radio and Display Receiver Assembly
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(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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Connected to
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D204-8 (CANH) - D204-19 (CANL)
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Cable disconnected from negative (-) battery terminal
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108 to 132 Ω
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Central gateway ECU (network gateway ECU)
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D204-10 (CANH) - D204-21 (CANL)
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Cable disconnected from negative (-) battery terminal
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200 Ω or higher
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DCM (telematics transceiver)*
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D204-11 (CANH) - D204-22 (CANL)
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Cable disconnected from negative (-) battery terminal
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200 Ω or higher
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Radio and display receiver assembly
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D204-9 (CANH) - D204-20 (CANL)
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Cable disconnected from negative (-) battery terminal
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108 to 132 Ω
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Central gateway ECU (network gateway ECU)
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-
*: w/ Telematics Transceiver
Result
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Proceed to
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OK
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A
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NG (Central gateway ECU (network gateway ECU) CAN main wire)
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B
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NG (ECU or sensor CAN branch wires)
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C
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A |
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REPLACE NO. 4 JUNCTION CONNECTOR
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B
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|
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2.
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CHECK FOR SHORT IN CAN BUS WIRE (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
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(a) Disconnect the central gateway ECU (network gateway ECU) connector.
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|
*a
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Front view of wire harness connector
(to Central Gateway ECU (Network Gateway ECU))
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|
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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D202-6 (CA3H) - D202-21 (CA3L)
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Cable disconnected from negative (-) battery terminal
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1 MΩ or higher
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D202-19 (CAYH) - D202-20 (CAYL)
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Cable disconnected from negative (-) battery terminal
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1 MΩ or higher
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NG |
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REPAIR OR REPLACE CAN MAIN BUS WIRE OR CONNECTOR (NO. 4 JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
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3.
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CHECK SHORT IN CAN BUS WIRE (ECU, SENSOR)
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(a) Reconnect all wire harness connectors.
(b) Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short circuited branch line is connected.
Click here
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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D202-6 (CA3H) - D202-21 (CA3L)
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Cable disconnected from negative (-) battery terminal
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54 to 69 Ω
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HINT:
If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
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*a
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Component with harness connected
(Central Gateway ECU (Network Gateway ECU))
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|
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OK |
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REPLACE CORRESPONDING ECU OR SENSOR
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NG |
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REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH WIRES OR CONNECTOR
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