DESCRIPTION
There may be a short circuit between the CAN main bus lines and/or CAN branch lines when the resistance between terminals 6 (CA3H) and 21 (CA3L) of the central gateway ECU (network gateway ECU) is below 54 Ω.
Symptom |
Trouble Area |
---|---|
Resistance between terminals 6 (CA3H) and 21 (CA3L) of the central gateway ECU (network gateway ECU) is below 54 Ω. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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Click here
DTC check procedure: Turn the ignition switch ON and wait at least approximately 60 seconds.
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HINT:
PROCEDURE
1. |
CHECK FOR SHORT IN CAN BUS LINES (NO. 3 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the No. 3 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. 3 CAN junction connector) |
*b |
to DCM (Telematics Transceiver) (w/ Telematics Transceiver) |
*c |
to Radio and Display Receiver Assembly (for Radio and Display Type) |
*d |
to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
Connected to |
---|---|---|---|
F114-8 (CANH) - F114-19 (CANL) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
DCM (Telematics transceiver)*1 |
F114-9 (CANH) - F114-20 (CANL) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Radio and display receiver assembly*2 |
F114-10 (CANH) - F114-21 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
Central gateway ECU (network gateway ECU) |
F114-11 (CANH) - F114-22 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
Central gateway ECU (network gateway ECU) |
Result |
Proceed to |
---|---|
OK |
A |
NG (Line to central gateway ECU (network gateway ECU)) |
B |
NG (Line to ECU or sensor) |
C |
A |
REPLACE NO. 3 CAN JUNCTION CONNECTOR |
C |
GO TO STEP 3 |
|
2. |
CHECK FOR SHORT IN CAN BUS LINES (NO. 3 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
(a) Disconnect the F74 central gateway ECU (network gateway ECU) connector.
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
OK |
REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) |
NG |
REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
3. |
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:
|
|
OK |
REPLACE ECU OR SENSOR |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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