Toyota Camry (XV70): Open in Bus 4 Main Bus Line
DESCRIPTION
There may be an open circuit in one of the CAN main bus lines when the resistance between terminals 22 (CA2H) and 7 (CA2L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher.
|
Symptom | Trouble Area |
|---|---|
|
Resistance between terminals 22 (CA2H) and 7 (CA2L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher. |
|
This malfunction is not related to the lines of a CAN branch or to ECUs or sensors connected to a CAN branch.
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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- 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 FOR OPEN IN CAN MAIN BUS LINES (NO. 3 JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the R99 No. 3 junction connector.
(c) Measure the resistance according to the value(s) in the table below.
|
*a | Front view of wire harness connector (to No. 3 Junction Connector) |
*b | to Central Gateway ECU (Network Gateway ECU) |
|
*c | to No. 2 CAN Junction Connector |
- | - |
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition | Connected to |
|---|---|---|---|
|
R99-10 (CANH) - R99-21 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω | Central gateway ECU (network gateway ECU) |
|
R99-11 (CANH) - R99-22 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω | No. 2 CAN junction connector |
|
Result | Proceed to |
|---|---|
|
OK | A |
|
NG (Line to central gateway ECU (network gateway ECU)) |
B |
| NG (Line to No. 2 CAN junction connector) |
C |
| A |
.gif) | REPLACE NO. 3 JUNCTION CONNECTOR |
| C |
| GO TO STEP 3 |
|
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| 2. |
CHECK FOR OPEN IN CAN MAIN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 3 JUNCTION CONNECTOR) |
(a) Reconnect the R99 No. 3 junction connector.
(b) Disconnect the K76 central gateway ECU (network gateway ECU) connector.
| (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| OK | | REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)
|
| NG | | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 3 JUNCTION CONNECTOR) |
| 3. |
CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 2 CAN JUNCTION CONNECTOR) |
(a) Reconnect the R99 No. 3 junction connector.
(b) Disconnect the A67 No. 2 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
|
*a | Front view of wire harness connector (to No. 2 CAN Junction Connector) |
*b | to No. 3 Junction Connector |
|
*c | to No. 4 CAN Junction Connector |
- | - |
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition | Connected to |
|---|---|---|---|
|
A67-2 (CANH) - A67-13 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω | No. 3 junction connector |
|
A67-5 (CANH) - A67-16 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω | No. 4 CAN junction connector |
|
Result | Proceed to |
|---|---|
|
OK | A |
|
NG (Line to No. 3 junction connector) |
B |
| NG (Line to No. 4 CAN junction connector) |
C |
| A |
| REPLACE NO. 2 CAN JUNCTION CONNECTOR |
| B |
| REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR) |
|
| 4. |
CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 4 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR) |
(a) Reconnect the A67 No. 2 CAN junction connector.
(b) Disconnect the K127 No. 4 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
|
*a | Front view of wire harness connector (to No. 4 CAN Junction Connector) |
*b | to No. 2 CAN Junction Connector |
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition | Connected to |
|---|---|---|---|
|
K127-6 (CANH) - K127-17 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω | No. 2 CAN junction connector |
| NG | | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR) |
|
| 5. |
CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 4 CAN JUNCTION CONNECTOR) |
(a) Reconnect the K127 No. 4 CAN junction connector.
(b) Disconnect the K128 No. 4 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
|
*a | Front view of wire harness connector (to No. 4 CAN Junction Connector) |
*b | to Airbag Sensor Assembly |
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition | Connected to |
|---|---|---|---|
|
K128-6 (CANH) - K128-17 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω | Airbag sensor assembly |
| OK | | REPLACE NO. 4 CAN JUNCTION CONNECTOR |
|
| 6. |
CHECK FOR OPEN IN CAN MAIN BUS LINES (AIRBAG SENSOR ASSEMBLY - NO. 4 CAN JUNCTION CONNECTOR) |
(a) Reconnect the K128 No. 4 CAN junction connector.
(b) Disconnect the K73 airbag sensor assembly connector.
| (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
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| OK | | REPLACE AIRBAG SENSOR ASSEMBLY
|
| NG | | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (AIRBAG SENSOR ASSEMBLY - NO. 4 CAN JUNCTION CONNECTOR) |
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