- Short in bus 2 CAN main wires
- Short in bus 2 CAN branch wires
- ECM
- 4WD control ECU*1
- Airbag sensor assembly
- Air conditioning amplifier assembly
- Central gateway ECU (network gateway ECU)
- Main body ECU (multiplex network body ECU)
- Brake actuator assembly (skid control ECU)
- Certification ECU (smart key ECU assembly)*2
- Power management control ECU*2
- Steering column assembly (power steering ECU)
- Steering angle sensor (spiral cable with sensor sub-assembly)
- Combination meter assembly
- No. 5 junction connector
- No. 6 junction connector
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018DN6 |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: NETWORKING: CAN COMMUNICATION SYSTEM: Check Bus 2 Lines for Short Circuit; 2018 - 2020 MY Sienna [11/2017 - ] | ||
|
Check Bus 2 Lines for Short Circuit |
DESCRIPTION
There may be a short circuit between the bus 2 CAN main wires and/or CAN branch wires when the resistance between terminals 18 (CA4H) and 17 (CA4L) of the central gateway ECU (network gateway ECU) is below 54 Ω.
|
Detection Item |
Trouble Area |
|---|---|
|
Trouble Area |
|
- *1: for AWD
- *2: w/ Smart Key System
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 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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-
Before replacing the ECM, power management control ECU, main body ECU (multiplex network body ECU) or certification ECU (smart key ECU assembly), refer to Registration.
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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 SHORT IN CAN BUS WIRES (COMBINATION METER ASSEMBLY - NO. 5 JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
|
(b) Disconnect the combination meter assembly connector. |
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D145-17 (CANH) - D145-16 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
| OK |
|
|
|
2. |
CONNECT CONNECTOR |
(a) Reconnect the D145 combination meter assembly connector.
|
|
3. |
CHECK FOR SHORT IN CAN BUS WIRES (ECM - NO. 6 JUNCTION CONNECTOR) |
|
(a) Disconnect the ECM connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A69-13 (CANH) - A69-26 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
| OK |
|
|
|
4. |
CONNECT CONNECTOR |
(a) Reconnect the A69 ECM connector.
|
|
5. |
CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 5 JUNCTION CONNECTOR) |
|
(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 |
|---|---|---|
|
D202-18 (CA4H) - D202-17 (CA4L) |
Cable disconnected from negative (-) battery terminal |
54 to 69 Ω |
| OK |
|
|
|
6. |
CONNECT CONNECTOR |
(a) Reconnect the D202 central gateway ECU (network gateway ECU) connector.
|
|
7. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 JUNCTION CONNECTOR) |
(a) Disconnect the No. 5 junction connector.
|
*a |
Front view of wire harness connector (to No. 5 Junction Connector) |
*b |
to No. 6 Junction Connector |
|
*c |
to Brake Actuator Assembly (Skid Control ECU) |
*d |
to Certification ECU (Smart Key ECU Assembly) (w/ Smart Key System) |
|
*e |
to Power Management Control ECU (w/ Smart Key System) |
*f |
to Combination Meter Assembly |
|
*g |
to Air Conditioning Amplifier Assembly |
*h |
to Central Gateway ECU (Network Gateway ECU) |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
Connect to |
|---|---|---|---|
|
D179-8 (CANH) - D179-19 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
No. 6 junction connector |
|
D179-1 (CANH) - D179-12 (CANL) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Brake actuator assembly (skid control ECU) |
|
D179-3 (CANH) - D179-14 (CANL) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Certification ECU (smart key ECU assembly)* |
|
D179-4 (CANH) - D179-15 (CANL) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Power management control ECU* |
|
D179-7 (CANH) - D179-18 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
Combination meter assembly |
|
D179-2 (CANH) - D179-13 (CANL) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Air conditioning amplifier assembly |
|
D179-5 (CANH) - D179-16 (CANL) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Central gateway ECU (network gateway ECU) |
- *: w/ Smart Key System
Result
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (Combination meter assembly CAN main wire) |
B |
|
NG (Central gateway ECU (network gateway ECU) CAN branch wire) |
C |
|
NG (No. 6 junction connector CAN main wire) |
D |
|
NG (ECU or sensor CAN branch wires) |
E |
| A |
|
REPLACE NO. 5 CAN JUNCTION CONNECTOR |
| B |
|
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY) |
| C |
|
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
| E |
|
|
|
8. |
CONNECT CONNECTOR |
(a) Reconnect the D179 No. 5 junction connector.
|
|
9. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 6 JUNCTION CONNECTOR) |
(a) Disconnect the No. 6 junction connector.
|
*a |
Front view of wire harness connector (to No. 6 Junction Connector) |
*b |
to No. 5 Junction Connector |
|
*c |
to Main Body ECU (Multiplex Network Body ECU) |
*d |
to 4WD ECU Assembly (for AWD) |
|
*e |
to Airbag Sensor Assembly |
*f |
to ECM |
|
*g |
to Steering Column Assembly (Power Steering ECU) |
*h |
to Steering Angle Sensor (Spiral Cable with Sensor Sub-assembly) |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
Connect to |
|---|---|---|---|
|
D180-1 (CANH) - D180-12 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
No. 5 junction connector |
|
D180-4 (CANH) - D180-15 (CANL) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Main body ECU (multiplex network body ECU) |
|
D180-5 (CANH) - D180-16 (CANL) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
4WD ECU assembly* |
|
D180-9 (CANH) - D180-20 (CANL) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Airbag sensor assembly |
|
D180-7 (CANH) - D180-18 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
ECM |
|
D180-3 (CANH) - D180-14 (CANL) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Steering column assembly (power steering ECU) |
|
D180-2 (CANH) - D180-13 (CANL) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Steering angle sensor (spiral cable with sensor sub-assembly) |
- *: for AWD
Result
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (ECM CAN main wire) |
B |
|
NG (No. 5 junction connector CAN main wire) |
C |
|
NG (ECU or sensor CAN branch wires) |
D |
| A |
|
REPLACE NO. 6 JUNCTION CONNECTOR |
| B |
|
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 6 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY) |
| C |
|
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 6 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR) |
|
|
10. |
CHECK FOR SHORT IN CAN BUS WIRES (ECU, SENSOR) |
|
(a) Reconnect the CAN junction connector. |
|
(b) Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short circuited CAN branch wire is connected.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D202-18 (CA4H) - D202-17 (CA4L) |
Cable disconnected from negative (-) battery terminal |
54 to 69 Ω |
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 CAN BRANCH WIRES OR CONNECTOR |
|
|