DESCRIPTION
There may be a short circuit between the CAN main bus lines and/or CAN branch lines when the resistance between terminals 22 (CA2H) and 7 (CA2L) of the central gateway ECU (network gateway ECU) is below 54 Ω.
Symptom | Trouble Area |
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Resistance between terminals 22 (CA2H) and 7 (CA2L) 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 power 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. 7 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the N99 No. 7 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. 7 CAN Junction Connector) | *b | to Tire Pressure Warning ECU and Receiver |
*c | to Occupant Detection ECU | *d | to Central Gateway ECU (Network Gateway ECU) |
*e | to No. 4 CAN Junction Connector | - | - |
Standard Resistance:
Tester Connection | Condition | Specified Condition | Connected to |
---|---|---|---|
N99-1 (CANH) - N99-7 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher | Tire pressure warning ECU and receiver |
N99-2 (CANH) - N99-8 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher | Occupant detection ECU |
N99-3 (CANH) - N99-9 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 108 to 132 Ω | Central gateway ECU (network gateway ECU) |
N99-4 (CANH) - N99-10 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 108 to 132 Ω | No. 4 CAN junction connector |
Result | Proceed to |
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OK | A |
NG (Line to central gateway ECU (network gateway ECU)) | B |
NG (Line to No. 4 CAN junction connector) | C |
NG (Line to ECU or sensor) | D |
A | REPLACE NO. 7 CAN JUNCTION CONNECTOR |
C | GO TO STEP 3 |
D | GO TO STEP 7 |
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2. | CHECK FOR SHORT IN CAN BUS LINES (NO. 7 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. 7 CAN Junction Connector) | *b | to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
N99-3 (CANH) - N99-9 (CANL) | Cable disconnected from negative (-) auxiliary 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. 7 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
3. | CHECK FOR SHORT IN CAN BUS LINES (NO. 4 CAN JUNCTION CONNECTOR - NO. 7 CAN JUNCTION CONNECTOR) |
(a) Reconnect the N99 No. 7 CAN junction connector.
(b) Disconnect the G99 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. 7 CAN Junction Connector |
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
G99-6 (CANH) - G99-17 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 108 to 132 Ω |
NG | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 7 CAN JUNCTION CONNECTOR) |
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4. | CHECK FOR SHORT IN CAN BUS LINES (NO. 4 CAN JUNCTION CONNECTOR) |
(a) Reconnect the G99 No. 4 CAN junction connector.
(b) Disconnect the G98 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 |
*c | to Steering Sensor | - | - |
Standard Resistance:
Tester Connection | Condition | Specified Condition | Connected to |
---|---|---|---|
G98-6 (CANH) - G98-17 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 108 to 132 Ω | No. 2 CAN junction connector |
G98-7 (CANH) - G98-18 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher | Steering sensor |
Result | Proceed to |
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OK | A |
NG (Line to No. 2 CAN junction connector) | B |
NG (Line to ECU or sensor) | C |
A | REPLACE NO. 4 CAN JUNCTION CONNECTOR |
C | GO TO STEP 7 |
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5. | CHECK FOR SHORT IN CAN BUS LINES (NO. 2 CAN JUNCTION CONNECTOR) |
(a) Reconnect the G98 No. 4 CAN junction connector.
(b) Disconnect the A69 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 Brake Booster with Master Cylinder Assembly |
*c | to Airbag ECU Assembly | *d | to ECM |
*e | to Rack and Pinion Power Steering Gear Assembly | *f | to No. 4 CAN Junction Connector |
*g | to Brake Actuator Assembly | *h | to Hybrid Vehicle Control ECU |
Standard Resistance:
Tester Connection | Condition | Specified Condition | Connected to |
---|---|---|---|
A69-1 (CANH) - A69-11 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher | Brake booster with master cylinder assembly |
A69-2 (CANH) - A69-12 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 108 to 132 Ω | Airbag ECU assembly |
A69-3 (CANH) - A69-13 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher | ECM |
A69-4 (CANH) - A69-14 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher | Rack and pinion power steering gear assembly |
A69-5 (CANH) - A69-15 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 108 to 132 Ω | No. 4 CAN junction connector |
A69-6 (CANH) - A69-16 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher | Brake actuator assembly |
A69-7 (CANH) - A69-17 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher | Hybrid vehicle control ECU |
Result | Proceed to |
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OK | A |
NG (Line to airbag ECU assembly) | B |
NG (Line to No. 4 CAN junction connector) | C |
NG (Line to ECU or sensor) | D |
A | REPLACE NO. 2 CAN JUNCTION CONNECTOR |
C | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 4 CAN JUNCTION CONNECTOR) |
D | GO TO STEP 7 |
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6. | CHECK FOR SHORT IN CAN BUS LINES (NO. 2 CAN JUNCTION CONNECTOR - AIRBAG ECU ASSEMBLY) |
(a) Disconnect the G64 airbag ECU assembly connector.
(b) 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 Airbag ECU Assembly |
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
A69-2 (CANH) - A69-12 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 1 MΩ or higher |
OK | REPLACE AIRBAG ECU ASSEMBLY |
NG | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - AIRBAG ECU ASSEMBLY) |
7. | CHECK FOR SHORT IN CAN BUS LINES (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 short circuited branch line is connected.
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(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
HINT:
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OK | REPLACE ECU OR SENSOR |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |