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 network gateway ECU and terminal 4 (CG) of the DLC3, or terminal 17 (CA4L) of the network gateway ECU and terminal 4 (CG) of the DLC3.
Symptom | Trouble Area |
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No resistance exists between terminal 18 (CA4H) of the network gateway ECU and terminal 4 (CG) of the DLC3, or terminal 17 (CA4L) of the network gateway ECU and terminal 4 (CG) of the DLC3. |
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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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.
*A | for DLC3 Connector Type A | *B | for DLC3 Connector Type B |
*1 | DLC3 | - | - |
*a | Front view of wire harness connector (to Network Gateway ECU) | - | - |
(b) Disconnect the J75 network gateway ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for DLC3 Connector Type A Tester Connection | Condition | Specified Condition |
---|---|---|
J75-18 (CA4H) - J12-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher |
J75-17 (CA4L) - J12-4 (CG) |
Tester Connection | Condition | Specified Condition |
---|---|---|
J75-18 (CA4H) - J141-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher |
J75-17 (CA4L) - J141-4 (CG) |
OK | ![]() | REPLACE NETWORK GATEWAY ECU |
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2. | CHECK FOR SHORT TO GND IN CAN BUS LINE (ECM) |
(a) Reconnect the J75 network gateway ECU connector.
(b) Disconnect the A37 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
*A | for DLC3 Connector Type A | *B | for DLC3 Connector Type B |
*1 | DLC3 | - | - |
*a | Front view of wire harness connector (to ECM) | - | - |
Standard Resistance:
for DLC3 Connector Type A Tester Connection | Condition | Specified Condition |
---|---|---|
A37-13 (CANH) - J12-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher |
A37-26 (CANL) - J12-4 (CG) |
Tester Connection | Condition | Specified Condition |
---|---|---|
A37-13 (CANH) - J141-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher |
A37-26 (CANL) - J141-4 (CG) |
OK | ![]() | REPLACE ECM |
NG | ![]() | REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - NETWORK GATEWAY ECU) |
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