Toyota Camry (XV70): Check Bus 2 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 18 (CA4H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 17 (CA4L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3.
|
Symptom | Trouble Area |
|---|---|
|
There is no resistance between terminal 18 (CA4H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 17 (CA4L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3. |
|
WIRING DIAGRAM
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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 SHORT TO GND IN CAN BUS LINE (NO. 2 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the A67 No. 2 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
|
*A | Before Jul. 2018 Production |
*B | From Jul. 2018 Production |
|
*1 | DLC3 |
- | - |
|
*a | Front view of wire harness connector (to No. 2 CAN Junction Connector) |
*b | to No. 4 CAN Junction Connector |
|
*c | to ECM |
- | - |
Standard Resistance:
Before Jul. 2018 Production:|
Tester Connection | Condition |
Specified Condition | Connected to |
|---|---|---|---|
|
A67-10 (CANH) - K68-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 4 CAN junction connector |
|
A67-21 (CANL) - K68-4 (CG) | |||
|
A67-11 (CANH) - K68-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
ECM |
| A67-22 (CANL) - K68-4 (CG) |
|
Tester Connection | Condition |
Specified Condition | Connected to |
|---|---|---|---|
|
A67-10 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 4 CAN junction connector |
|
A67-21 (CANL) - K138-4 (CG) | |||
|
A67-11 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
ECM |
| A67-22 (CANL) - K138-4 (CG) |
|
Result | Proceed to |
|---|---|
|
OK | A |
|
NG (Line to ECM) | B |
|
NG (Line to No. 4 CAN junction connector) |
C |
| A |
.gif) | REPLACE NO. 2 CAN JUNCTION CONNECTOR |
| C |
| GO TO STEP 3 |
|
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| 2. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 2 CAN JUNCTION CONNECTOR - ECM) |
(a) Disconnect the A21 or A24 ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
|
*A | Before Jul. 2018 Production |
*B | From Jul. 2018 Production |
|
*1 | DLC3 |
- | - |
|
*a | Front view of wire harness connector (to No. 2 CAN Junction Connector) |
*b | to ECM |
Standard Resistance:
Before Jul. 2018 Production:|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A67-11 (CANH) - K68-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
A67-22 (CANL) - K68-4 (CG) |
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A67-11 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
A67-22 (CANL) - K138-4 (CG) |
|
Result | Proceed to |
|---|---|
|
OK (for A25A-FKS) | A |
|
OK (for 2GR-FKS) | B |
|
NG | C |
| A |
| REPLACE ECM
|
| B |
| REPLACE ECM
|
| C |
| REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
| 3. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 4 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR) |
(a) Disconnect the K128 No. 4 CAN junction connector.
(b) Measure the resistance according to the value(s) in the table below.
|
*A | Before Jul. 2018 Production |
*B | From Jul. 2018 Production |
|
*1 | DLC3 |
- | - |
|
*a | Front view of wire harness connector (to No. 4 CAN Junction Connector) |
*b | to No. 2 CAN Junction Connector |
Standard Resistance:
Before Jul. 2018 Production:|
Tester Connection | Condition |
Specified Condition | Connected to |
|---|---|---|---|
|
K128-11 (CANH) - K68-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 2 CAN junction connector |
|
K128-22 (CANL) - K68-4 (CG) |
|
Tester Connection | Condition |
Specified Condition | Connected to |
|---|---|---|---|
|
K128-11 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 2 CAN junction connector |
|
K128-22 (CANL) - K138-4 (CG) |
| NG | | REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR) |
|
| 4. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 4 CAN JUNCTION CONNECTOR) |
(a) Disconnect the K127 No. 4 CAN junction connector.
(b) Measure the resistance according to the value(s) in the table below.
|
*A | Before Jul. 2018 Production |
*B | From Jul. 2018 Production |
|
*1 | DLC3 |
- | - |
|
*a | Front view of wire harness connector (to No. 4 CAN Junction Connector) |
*b | to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
Before Jul. 2018 Production:|
Tester Connection | Condition |
Specified Condition | Connected to |
|---|---|---|---|
|
K127-1 (CANH) - K68-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Central gateway ECU (network gateway ECU) |
|
K127-12 (CANL) - K68-4 (CG) |
|
Tester Connection | Condition |
Specified Condition | Connected to |
|---|---|---|---|
|
K127-1 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Central gateway ECU (network gateway ECU) |
|
K127-12 (CANL) - K138-4 (CG) |
| OK | | REPLACE NO. 4 CAN JUNCTION CONNECTOR |
|
| 5. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 4 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.
|
*A | Before Jul. 2018 Production |
*B | From Jul. 2018 Production |
|
*1 | DLC3 |
- | - |
|
*a | Front view of wire harness connector (to No. 4 CAN Junction Connector) |
*b | to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
Before Jul. 2018 Production:|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
K127-1 (CANH) - K68-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
K127-12 (CANL) - K68-4 (CG) |
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
K127-1 (CANH) - K138-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
K127-12 (CANL) - K138-4 (CG) |
| OK | | REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)
|
| NG | | REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
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