Toyota Camry (XV70): Check Bus 1 Line for Short to GND
DESCRIPTION
There may be a short circuit between one of the CAN bus lines and GND when there is no resistance between terminal 23 (CA1H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 8 (CA1L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3.
|
Symptom | Trouble Area |
|---|---|
|
There is no resistance between terminal 23 (CA1H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 8 (CA1L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3. |
|
WIRING DIAGRAM
w/ Parking Assist Monitor System or Panoramic View Monitor System.png)
w/ Rear View Monitor System
.png)
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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- 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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- 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:
- 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 VEHICLE TYPE |
(a) Check vehicle type.
|
Result | Proceed to |
|---|---|
|
w/ Parking Assist Monitor System or Panoramic View Monitor System |
A |
| w/ Rear View Monitor System |
B |
| B |
.gif) | GO TO STEP 6 |
|
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| 2. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the A66 No. 1 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
|
*1 | DLC3 |
- | - |
|
*a | Front view of wire harness connector (to No. 1 CAN Junction Connector) |
*b | to Millimeter Wave Radar Sensor Assembly (w/ Front Camera System) |
|
*c | to Forward Recognition Camera (w/ Front Camera System) |
*d | to Central Gateway ECU (Network Gateway ECU) |
|
*e | to No. 5 CAN Junction Connector |
- | - |
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition | Connected to |
|---|---|---|---|
|
A66-1 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Millimeter wave radar sensor assembly* |
|
A66-7 (CANL) - K138-4 (CG) | |||
|
A66-2 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Forward recognition camera* |
|
A66-8 (CANL) - K138-4 (CG) | |||
|
A66-3 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Central gateway ECU (network gateway ECU) |
|
A66-9 (CANL) - K138-4 (CG) | |||
|
A66-5 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 5 CAN junction connector |
|
A66-11 (CANL) - K138-4 (CG) |
- *: w/ Front Camera System
|
Result | Proceed to |
|---|---|
|
OK | A |
|
NG (Line to central gateway ECU (network gateway ECU)) |
B |
| NG (Line to No. 5 CAN junction connector) |
C |
| NG (Line to ECU or sensor) |
D |
| A |
| REPLACE NO. 1 CAN JUNCTION CONNECTOR |
| C |
| GO TO STEP 4 |
| D |
| GO TO STEP 8 |
|
| 3. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
(a) Disconnect the K76 central gateway ECU (network gateway ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
|
*1 | DLC3 |
- | - |
|
*a | Front view of wire harness connector (to No. 1 CAN Junction Connector) |
*b | to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A66-3 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
A66-9 (CANL) - K138-4 (CG) |
| OK | | REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)
|
| NG | | REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
| 4. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 5 CAN JUNCTION CONNECTOR) |
(a) Disconnect the R98 No. 5 CAN junction connector.
(b) Measure the resistance according to the value(s) in the table below.
|
*1 | DLC3 |
- | - |
|
*a | Front view of wire harness connector (to No. 5 CAN Junction Connector) |
*b | to Central Gateway ECU (Network Gateway ECU) |
|
*c | to Clearance Warning ECU Assembly (w/ Intuitive Parking Assist System) |
*d | to Blind Spot Monitor Sensor RH (w/ Blind Spot Monitor System) |
|
*e | to Rear Television Camera Assembly |
*f | to No. 1 CAN Junction Connector |
|
*g | to Television Camera Controller (w/ Panoramic View Monitor System) |
- | - |
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition | Connected to |
|---|---|---|---|
|
R98-1 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Central gateway ECU (network gateway ECU) |
|
R98-11 (CANL) - K138-4 (CG) | |||
|
R98-2 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Clearance warning ECU assembly*1 |
|
R98-12 (CANL) - K138-4 (CG) | |||
|
R98-3 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Blind spot monitor sensor RH*2 |
|
R98-13 (CANL) - K138-4 (CG) | |||
|
R98-4 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Rear television camera assembly |
|
R98-14 (CANL) - K138-4 (CG) | |||
|
R98-5 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 1 CAN junction connector |
|
R98-15 (CANL) - K138-4 (CG) | |||
|
R98-8 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Television camera controller*3 |
|
R98-18 (CANL) - K138-4 (CG) |
- *1: w/ Intuitive Parking Assist System
- *2: w/ Blind Spot Monitor System
- *3: w/ Panoramic View Monitor System
|
Result | Proceed to |
|---|---|
|
OK | A |
|
NG (Line to central gateway ECU (network gateway ECU)) |
B |
| NG (Line to No. 1 CAN junction connector) |
C |
| NG (Line to ECU or sensor) |
D |
| A |
| REPLACE NO. 5 CAN JUNCTION CONNECTOR |
| C |
| REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR) |
| D |
| GO TO STEP 8 |
|
| 5. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 5 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
(a) Disconnect the K76 central gateway ECU (network gateway ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
|
*1 | DLC3 |
- | - |
|
*a | Front view of wire harness connector (to No. 5 CAN Junction Connector) |
*b | to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
R98-1 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
R98-11 (CANL) - K138-4 (CG) |
| OK | | REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)
|
| NG | | REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
| 6. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the A66 No. 1 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
|
*1 | DLC3 |
- | - |
|
*a | Front view of wire harness connector (to No. 1 CAN Junction Connector) |
*b | to Millimeter Wave Radar Sensor Assembly (w/ Front Camera System) |
|
*c | to Forward Recognition Camera (w/ Front Camera System) |
*d | to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition | Connected to |
|---|---|---|---|
|
A66-1 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Millimeter wave radar sensor assembly* |
|
A66-7 (CANL) - K138-4 (CG) | |||
|
A66-2 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Forward recognition camera* |
|
A66-8 (CANL) - K138-4 (CG) | |||
|
A66-3 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Central gateway ECU (network gateway ECU) |
|
A66-9 (CANL) - K138-4 (CG) | |||
|
A66-5 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Central gateway ECU (network gateway ECU) |
|
A66-11 (CANL) - K138-4 (CG) |
- *: w/ Front Camera System
|
Result | Proceed to |
|---|---|
|
OK | A |
|
NG (Line to central gateway ECU (network gateway ECU)) |
B |
| NG (Line to ECU or sensor) |
C |
| A |
| REPLACE NO. 1 CAN JUNCTION CONNECTOR |
| C |
| GO TO STEP 8 |
|
| 7. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
(a) Disconnect the K76 central gateway ECU (network gateway ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
|
*1 | DLC3 |
- | - |
|
*a | Front view of wire harness connector (to No. 1 CAN Junction Connector) |
*b | to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A66-3 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
A66-9 (CANL) - K138-4 (CG) | ||
|
A66-5 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
A66-11 (CANL) - K138-4 (CG) |
| OK | | REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)
|
| NG | | REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
| 8. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (ECU OR 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 line shorted to GND is connected.
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(c) Measure the resistance according to the value(s) in the table below.
|
*1 | DLC3 |
- | - |
|
*a | Component with harness connected (Central Gateway ECU (Network Gateway ECU)) |
- | - |
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
K76-23 (CA1H) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
K76-8 (CA1L) - K138-4 (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 ground 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 |
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