DESCRIPTION
There may be a short circuit between the CAN main bus lines and/or CAN branch lines when the resistance between terminals 18 (CA4H) and 17 (CA4L) of the central gateway ECU (network gateway ECU) is below 54 Ω.
Symptom | Trouble Area |
---|---|
Resistance between terminals 18 (CA4H) and 17 (CA4L) of the central gateway ECU (network gateway ECU) is below 54 Ω. |
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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 engine switch on (IG) 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 IN CAN BUS LINES (NO. 2 JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the A71 No. 2 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 Junction Connector) | *b | to No. 4 CAN Junction Connector |
*c | to ECM | - | - |
Standard Resistance:
Tester Connection | Condition | Specified Condition | Connected to |
---|---|---|---|
A71-8 (CANH) - A71-19 (CANL) | Cable disconnected from negative (-) battery terminal | 108 to 132 Ω | No. 4 CAN junction connector |
A71-11 (CANH) - A71-22 (CANL) | Cable disconnected from negative (-) battery terminal | 108 to 132 Ω | ECM |
Result | Proceed to |
---|---|
OK | A |
NG (Line to ECM) | B |
NG (Line to No. 4 CAN junction connector) | C |
A | REPLACE NO. 2 JUNCTION CONNECTOR |
C | GO TO STEP 3 |
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2. | CHECK FOR SHORT IN CAN BUS LINES (NO. 2 JUNCTION CONNECTOR - ECM) |
(a) Disconnect the A25 ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
*a | Front view of wire harness connector (to No. 2 Junction Connector) | *b | to ECM |
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
A71-11 (CANH) - A71-22 (CANL) | Cable disconnected from negative (-) battery terminal | 1 MΩ or higher |
OK | REPLACE ECM |
NG | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - ECM) |
3. | CHECK FOR SHORT IN CAN BUS LINES (NO. 4 CAN JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR) |
(a) Disconnect the G99 No. 4 CAN junction connector.
(b) 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 Junction Connector |
Standard Resistance:
Tester Connection | Condition | Specified Condition | Connected to |
---|---|---|---|
G99-11 (CANH) - G99-22 (CANL) | Cable disconnected from negative (-) battery terminal | 1 MΩ or higher | No. 2 junction connector |
NG | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR) |
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4. | CHECK FOR SHORT IN CAN BUS LINES (NO. 4 CAN JUNCTION CONNECTOR) |
(a) Disconnect the G98 No. 4 CAN junction connector.
(b) 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 Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
G98-1 (CANH) - G98-12 (CANL) | Cable disconnected from negative (-) battery terminal | 108 to 132 Ω |
OK | REPLACE NO. 4 CAN JUNCTION CONNECTOR |
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5. | CHECK FOR SHORT IN CAN BUS LINES (NO. 4 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
(a) Disconnect the G66 central gateway ECU (network gateway ECU) connector.
(b) 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 Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
G98-1 (CANH) - G98-12 (CANL) | Cable disconnected from negative (-) battery terminal | 1 MΩ or higher |
OK | REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) |
NG | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |