- Short in bus 3 CAN main wires
- Short in bus 3 CAN branch wires
- Central gateway ECU (network gateway ECU)
- Radio and display receiver assembly
- DCM (telematics transceiver)*
- No. 4 junction connector
| 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 |
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 |
Trouble Area |
|---|---|
|
Resistance between terminals 6 (CA3H) and 21 (CA3L) of central gateway ECU (network gateway ECU) is below 54 Ω. |
|
- *: w/ Telematics Transceiver
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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![2018 - 2020 MY Sienna [11/2017 - ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING](/t3Portal/stylegraphics/info.gif)
- Before measuring the resistance of the CAN bus, turn the engine 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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-
Before replacing the DCM (telematics transceiver), refer to Registration.
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-
The following may occur if a radio and display receiver assembly from another vehicle is installed to this vehicle. Therefore, when replacing the radio and display receiver assembly, be sure to replace it with a new one.
- A communication malfunction DTC is stored.
- The radio and display receiver assembly does not operate normally.
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 SHORT IN CAN BUS WIRE (NO. 4 JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the No. 4 junction connector.
|
*a |
Front view of wire harness connector (to No. 4 junction connector) |
*b |
Central Gateway ECU (Network Gateway ECU) |
|
*c |
to DCM (Telematics Transceiver) (w/ Telematics Transceiver) |
*d |
to Radio and Display Receiver Assembly |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
Connected to |
|---|---|---|---|
|
D204-8 (CANH) - D204-19 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
Central gateway ECU (network gateway ECU) |
|
D204-10 (CANH) - D204-21 (CANL) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
DCM (telematics transceiver)* |
|
D204-11 (CANH) - D204-22 (CANL) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Radio and display receiver assembly |
|
D204-9 (CANH) - D204-20 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
Central gateway ECU (network gateway ECU) |
- *: w/ Telematics Transceiver
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (Central gateway ECU (network gateway ECU) CAN main wire) |
B |
|
NG (ECU or sensor CAN branch wires) |
C |
| A |
|
REPLACE NO. 4 JUNCTION CONNECTOR |
| C |
|
|
|
2. |
CHECK FOR SHORT IN CAN BUS WIRE (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
|
(a) Disconnect the central gateway ECU (network gateway ECU) connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D202-6 (CA3H) - D202-21 (CA3L) |
Cable disconnected from negative (-) battery terminal |
1 MΩ or higher |
|
D202-19 (CAYH) - D202-20 (CAYL) |
Cable disconnected from negative (-) battery terminal |
1 MΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE CAN MAIN BUS WIRE OR CONNECTOR (NO. 4 JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
|
3. |
CHECK SHORT IN CAN BUS WIRE (ECU, SENSOR) |
(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.
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|
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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. |
|
| OK |
|
REPLACE CORRESPONDING ECU OR SENSOR |
| NG |
|
REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH WIRES OR CONNECTOR |
|
|