- 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: RM100000001L5AR |
| Model Year Start: 2020 | Model: RAV4 | Prod Date Range: [10/2019 - 08/2020] |
| Title: NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): Check Bus 3 Line for Short to GND; 2020 MY RAV4 [10/2019 - 08/2020] | ||
|
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.
Click here
![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.
Click here
-
Some parts must be initialized and set when replacing or removing and installing parts.
Click here
-
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.
Click here
-
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 |
|
| 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 |
|
|