DESCRIPTION
There may be a short circuit between one of the CAN bus lines and +B when no resistance exists between terminal 18 (CA4H) of the network gateway ECU and terminal 16 (BAT) of the DLC3, or terminal 17 (CA4L) of the network gateway ECU and terminal 16 (BAT) of the DLC3.
Symptom | Trouble Area |
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No resistance exists between terminal 18 (CA4H) of the network gateway ECU and terminal 16 (BAT) of the DLC3, or terminal 17 (CA4L) of the network gateway ECU and terminal 16 (BAT) of the DLC3. |
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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HINT:
PROCEDURE
1. | CHECK FOR SHORT TO +B IN CAN BUS LINE (NETWORK GATEWAY ECU) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the J75 network gateway ECU connector.
*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) | - | - |
(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) - J12-16 (BAT) | Cable disconnected from negative (-) battery terminal | 6 kΩ or higher |
J75-17 (CA4L) - J12-16 (BAT) |
Tester Connection | Condition | Specified Condition |
---|---|---|
J75-18 (CA4H) - J141-16 (BAT) | Cable disconnected from negative (-) battery terminal | 6 kΩ or higher |
J75-17 (CA4L) - J141-16 (BAT) |
OK | REPLACE NETWORK GATEWAY ECU |
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2. | CHECK FOR SHORT TO +B 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) - J12-16 (BAT) | Cable disconnected from negative (-) battery terminal | 6 kΩ or higher |
A37-26 (CANL) - J12-16 (BAT) |
Tester Connection | Condition | Specified Condition |
---|---|---|
A37-13 (CANH) - J141-16 (BAT) | Cable disconnected from negative (-) battery terminal | 6 kΩ or higher |
A37-26 (CANL) - J141-16 (BAT) |
OK | REPLACE ECM |
NG | REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - NETWORK GATEWAY ECU) |
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