- Short to GND in CAN main bus wire
- Short to GND in CAN branch wire
- Central gateway ECU (network gateway ECU)
- Steering sensor
- Occupant detection ECU
- Rack and pinion power steering gear assembly
- Brake actuator assembly (skid control ECU)
- 4WD ECU assembly*1
- Airbag ECU assembly
- Tire pressure warning ECU and receiver*2
- No. 1 CAN junction connector
- No. 4 CAN junction connector
- No. 6 CAN junction connector
| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000001R23D |
| Model Year Start: 2021 | Model: RAV4 | Prod Date Range: [08/2020 - ] |
| Title: NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): Check Bus 4 Line for Short to GND; 2021 - 2024 MY RAV4 [08/2020 - ] | ||
|
Check Bus 4 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 22 (CA2H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 7 (CA2L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3
|
Symptom |
Trouble Area |
|---|---|
|
*1: for AWD
*2: w/ Tire Pressure Warning System (Tire Inflation Pressure Display Function) |
|
|
There is no resistance between terminal 22 (CA2H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 7 (CA2L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3. |
|
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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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 SHORT TO GND IN CAN BUS WIRE (NO. 1 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the No. 1 CAN junction connector.
|
*a |
Front view of wire harness connector (to No. 1 CAN Junction Connector) |
*b |
to No. 4 CAN Junction Connector |
|
*c |
to No. 6 CAN Junction Connector |
*d |
to Steering Sensor |
|
*e |
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 |
|---|---|---|---|
|
G96-9 (CANH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 4 CAN junction connector |
|
G96-20 (CANL) - G114-4 (CG) |
|||
|
G96-10 (CANH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 6 CAN junction connector |
|
G96-21 (CANL) - G114-4 (CG) |
|||
|
G96-11 (CANH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Steering sensor |
|
G96-22 (CANL) - G114-4 (CG) |
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (No. 6 CAN junction connector CAN main wire) |
B |
|
NG (No. 4 CAN junction connector CAN main wire) |
C |
|
NG (Wire to ECU or sensor) |
D |
| A |
|
REPLACE NO. 1 CAN JUNCTION CONNECTOR |
| C |
|
| D |
|
|
|
2. |
CHECK SHORT TO GND IN CAN BUS WIRE (NO. 6 CAN JUNCTION CONNECTOR) |
(a) Reconnect the G96 No. 1 CAN junction connector.
(b) Disconnect the No. 6 CAN junction connector.
|
*a |
Front view of wire harness connector (to No. 6 CAN Junction Connector) |
*b |
to Tire Pressure Warning ECU and Receiver (w/ Tire Pressure Warning System [Tire Inflation Pressure Display Function]) |
|
*c |
to Occupant Detection ECU |
*d |
to Central Gateway ECU (Network Gateway ECU) |
|
*e |
to No. 1 CAN Junction Connector |
*f |
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 |
|---|---|---|---|
| *: w/ Tire Pressure Warning System (Tire Inflation Pressure Display Function) | |||
|
M31-1 (CANH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Tire pressure warning ECU and receiver* |
|
M31-7 (CANL) - G114-4 (CG) |
|||
|
M31-2 (CANH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Occupant detection ECU |
|
M31-8 (CANL) - G114-4 (CG) |
|||
|
M31-3 (CANH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Central gateway ECU (network gateway ECU) |
|
M31-9 (CANL) - G114-4 (CG) |
|||
|
M31-4 (CANH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 1 CAN junction connector |
|
M31-10 (CANL) - G114-4 (CG) |
|||
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (Central gateway ECU [network gateway ECU] CAN main wire) |
B |
|
NG (No. 1 CAN junction connector CAN main wire) |
C |
|
NG (Wire to ECU or sensor) |
D |
| A |
|
REPLACE NO. 6 CAN JUNCTION CONNECTOR |
| C |
|
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR) |
| D |
|
|
|
3. |
CHECK SHORT TO GND IN CAN BUS WIRE (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 6 CAN JUNCTION CONNECTOR) |
(a) Reconnect the M31 No. 6 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 |
|---|---|---|
|
G72-22 (CA2H) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
G72-7 (CA2L) - 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. 6 CAN JUNCTION CONNECTOR) |
|
4. |
CHECK SHORT TO GND IN CAN BUS WIRE (NO. 4 CAN JUNCTION CONNECTOR) |
(a) Reconnect the G96 No. 1 CAN junction connector.
(b) Disconnect the No. 4 CAN junction connector.
|
*a |
Front view of wire harness connector (to No. 4 CAN Junction Connector) |
*b |
to Brake Actuator Assembly (Skid Control ECU) |
|
*c |
to Airbag ECU Assembly |
*d |
to 4WD ECU Assembly (for AWD) |
|
*e |
to No. 1 CAN Junction Connector |
*f |
to Rack and Pinion Power Steering Gear Assembly |
|
*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 |
|---|---|---|---|
| *: for AWD | |||
|
G104-1 (CANH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Brake actuator assembly (skid control ECU) |
|
G104-7 (CANL) - G114-4 (CG) |
|||
|
G104-2 (CANH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Airbag ECU assembly |
|
G104-8 (CANL) - G114-4 (CG) |
|||
|
G104-3 (CANH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
4WD ECU assembly* |
|
G104-9 (CANL) - G114-4 (CG) |
|||
|
G104-4 (CANH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 1 CAN junction connector |
|
G104-10 (CANL) - G114-4 (CG) |
|||
|
G104-5 (CANH) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Rack and pinion power steering gear assembly |
|
G104-11 (CANL) - G114-4 (CG) |
|||
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (No. 1 CAN junction connector CAN main wire) |
B |
|
NG (Wire to ECU or sensor) |
C |
| A |
|
REPLACE NO. 4 CAN JUNCTION CONNECTOR |
| B |
|
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR) |
| C |
|
|
5. |
CHECK 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 short 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 |
|---|---|---|
|
G72-22 (CA2H) - G114-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
G72-7 (CA2L) - 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 |
|
REPAIR ECU OR SENSOR |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|