- There is no resistance between terminal 6 (CA3H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 21 (CA3L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3.
- There is no resistance between terminal 19 (CAYH) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 20 (CAYL) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3.
| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000001R239 |
| Model Year Start: 2021 | Model: RAV4 | Prod Date Range: [08/2020 - 10/2022] |
| Title: NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): Check Bus 3 Line for Short to GND; 2021 - 2022 MY RAV4 [08/2020 - 10/2022] | ||
|
Check Bus 3 Line for Short to GND |
DESCRIPTION
There may be a short circuit between one of the CAN bus wires and GND when there is no resistance between terminal 6 (CA3H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 21 (CA3L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 19 (CAYH) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 20 (CAYL) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3.
|
Symptom |
Trouble Area |
|---|---|
|
*1: w/ Telematics System
*2: w/ Bus Buffer ECU *3: for Radio and Display Type |
|
|
|
|
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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![2019 - 2024 MY RAV4 [11/2018 - ]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): 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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-
The following malfunctions 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 new one.
- Communication malfunction DTC is output
- Does not operate normally
HINT:
- Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
- Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.
PROCEDURE
|
1. |
CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 5 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the No. 5 CAN junction connector.
|
*a |
Front view of wire harness connector (to No. 5 CAN Junction Connector) |
*b |
to Central Gateway ECU (Network Gateway ECU) |
|
*c |
to Radio and Display Receiver Assembly (for Radio and Display Type) |
*d |
to DCM (Telephone Transceiver Assembly) (w/ Telematics System) |
|
*e |
to Bus Buffer ECU (w/ Bus Buffer ECU) |
*f |
to Central Gateway ECU (Network Gateway ECU) |
|
*g |
Front view of DLC3 |
- |
- |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
Connected to |
|---|---|---|---|
|
*1: w/ Telematics System
*2: w/ Bus Buffer ECU *3: for Radio and Display Type |
|||
|
G105-1 (CANH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Bus buffer ECU*2 |
|
G105-12 (CANH) - G114-4 (CG) |
|||
|
G105-2 (CANH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Central gateway ECU (network gateway ECU) |
|
G105-13 (CANL) - G114-4 (CG) |
|||
|
G105-3 (CANH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
DCM (telephone transceiver assembly)*1 |
|
G105-14 (CANL) - G114-4 (CG) |
|||
|
G105-4 (CANH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Central gateway ECU (network gateway ECU) |
|
G105-15 (CANL) - G114-4 (CG) |
|||
|
G105-5 (CANH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Radio and display receiver assembly*3 |
|
G105-16 (CANL) - G114-4 (CG) |
|||
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (Central gateway ECU [network gateway ECU] CAN main wire) |
B |
|
NG (Wire to ECU or sensor) |
C |
| A |
|
REPLACE NO. 5 CAN JUNCTION CONNECTOR |
| C |
|
|
|
2. |
CHECK FOR SHORT TO GND IN CAN BUS WIRE (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 5 CAN JUNCTION CONNECTOR) |
(a) Reconnect the G105 No. 5 CAN junction connector.
|
(b) Disconnect the central gateway ECU (network gateway ECU) connector. |
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G72-6 (CA3H) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
G72-21 (CA3L) - G114-4 (CG) |
||
|
G72-19 (CAYH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
G72-20 (CAYL) - G114-4 (CG) |
| OK |
|
REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)
|
| NG |
|
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 5 CAN JUNCTION CONNECTOR) |
|
3. |
CHECK FOR SHORT TO GND 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 bus wire shorted to GND is connected. Click here
|
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G72-6 (CA3H) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
G72-21 (CA3L) - G114-4 (CG) |
HINT:
- If the resistance changes to 200 Ω or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
- If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short to GND in the wire harness and repair or replace the wire harness or connector if necessary.
| OK |
|
REPLACE ECU OR SENSOR |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|