DESCRIPTION
There may be a short circuit between one of the CAN bus lines and +B when no resistance exists between terminal 6 (CA3H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 21 (CA3L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.
Detection Item |
Trouble Area |
---|---|
No resistance exists between terminal 6 (CA3H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 21 (CA3L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
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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.
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HINT:
PROCEDURE
1. |
CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 6 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the No. 6 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
Text in Illustration
*1 |
DLC3 |
- |
- |
*a |
Front view of wire harness connector (to No. 6 CAN Junction Connector) |
*b |
to Central Gateway ECU (Network Gateway ECU) |
*c |
to Navigation Receiver Assembly (for Navigation Receiver Type) or Radio and Display Receiver Assembly (for Radio and Display Type) |
- |
- |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
Connected to |
---|---|---|---|
J22-9 (CANH) - D4-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Central gateway ECU (network gateway ECU) |
J22-20 (CANL) - D4-16 (BAT) |
|||
J22-10 (CANH) - D4-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Central gateway ECU (network gateway ECU) |
J22-21 (CANL) - D4-16 (BAT) |
|||
J22-11 (CANH) - D4-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Navigation receiver assembly*1 or Radio and display receiver assembly*2 |
J22-22 (CANL) - D4-16 (BAT) |
Result |
Proceed to |
---|---|
OK |
A |
NG (Central gateway ECU (network gateway ECU) CAN main line) |
B |
NG (ECU or sensor CAN branch lines) |
C |
A |
REPLACE NO. 6 CAN JUNCTION CONNECTOR |
C |
GO TO STEP 3 |
|
2. |
CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 6 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
(a) Disconnect the N36 central gateway ECU (network gateway ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
Text in Illustration
*1 |
DLC3 |
- |
- |
*a |
Front view of wire harness connector (to No. 6 CAN Junction Connector) |
*b |
to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
J22-9 (CANH) - D4-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
J22-20 (CANL) - D4-16 (BAT) |
||
J22-10 (CANH) - D4-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
J22-21 (CANL) - D4-16 (BAT) |
OK |
REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) |
NG |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
3. |
CHECK FOR SHORT TO B+ IN CAN BUS LINES (ECU, SENSOR) |
(a) Reconnect the CAN junction connector. |
|
(b) Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus line shorted to +B is connected
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
N36-6 (CA3H) - D4-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
N36-21 (CA3L) - D4-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
*a |
Component with harness connected (Central Gateway ECU (Network Gateway ECU)) |
*b |
Front view of DLC3 |
HINT:
If the resistance changes to 6 kΩ or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
OK |
REPLACE ECU OR SENSOR |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Inspection
INSPECTION
PROCEDURE
1. INSPECT BRAKE VACUUM CHECK VALVE ASSEMBLY
(a) Check that there is ventilation from the booster to the engine, and
no ventilation from the engine to the booster.
If the results are not as specified, replace the vacuum check valve.
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HINT:
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