DESCRIPTION
There may be a short circuit between one of the CAN bus lines and GND when there is no resistance between terminal 6 (CA3H) of the network gateway ECU and terminal 4 (CG) of the DLC3, or terminal 21 (CA3L) of the network gateway ECU and terminal 4 (CG) of the DLC3.
Symptom | Trouble Area |
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There is no resistance between terminal 6 (CA3H) of the network gateway ECU and terminal 4 (CG) of the DLC3, or terminal 21 (CA3L) of the network gateway ECU and terminal 4 (CG) of the DLC3. |
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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 TO GND IN CAN BUS LINE (NETWORK GATEWAY ECU) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the J75 network gateway ECU connector.
*1 | DLC3 | - | - |
*a | Front view of wire harness connector (to Network Gateway ECU) | - | - |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
J75-6 (CA3H) - J141-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher |
J75-21 (CA3L) - J141-4 (CG) |
OK | REPLACE NETWORK GATEWAY ECU |
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2. | CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 6 CAN JUNCTION CONNECTOR) |
(a) Reconnect the J75 network gateway ECU connector.
(b) Disconnect the J98 No. 6 CAN junction connector.
*1 | DLC3 | - | - |
*a | Front view of wire harness connector (to No. 6 CAN Junction Connector) | *b | to Network Gateway ECU |
*c | to DCM (Telematics Transceiver) (w/ Manual (SOS) Switch) | *d | to Radio Receiver Assembly |
*e | to Network Gateway ECU | - | - |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition | Connected to |
---|---|---|---|
J98-7 (CANH) - J141-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | Network gateway ECU |
J98-18 (CANL) - J141-4 (CG) | |||
J98-9 (CANH) - J141-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | DCM (telematics transceiver)* |
J98-20 (CANL) - J141-4 (CG) | |||
J98-10 (CANH) - J141-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | Radio receiver assembly |
J98-21 (CANL) - J141-4 (CG) | |||
J98-11 (CANH) - J141-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | Network gateway ECU |
J98-22 (CANL) - J141-4 (CG) |
Result | Proceed to |
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OK | A |
NG (Network gateway ECU main line) | B |
NG (ECU or sensor bus line) | C |
A | REPLACE NO. 6 CAN JUNCTION CONNECTOR |
B | REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - NETWORK GATEWAY ECU) |
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3. | CHECK FOR SHORT TO GND IN CAN BUS LINE (ECU, 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 bus line shorted to GND is connected.
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(c) Measure the resistance according to the value(s) in the table below.
*1 | DLC3 | - | - |
*a | Component with harness connected (Network Gateway ECU) | - | - |
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
J75-6 (CA3H) - J141-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher |
J75-21 (CA3L) - J141-4 (CG) |
HINT:
If the resistance changes to 200 Ω or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
OK | REPLACE CORRESPONDING ECU OR SENSOR |
NG | REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR CAN BUS LINE OR CONNECTOR |
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