Last Modified: 11-20-2023 |
6.11:8.1.0 |
Doc ID: RM1000000012T43 |
Model Year Start: 2018 |
Model: Camry |
Prod Date Range: [03/2017 - 06/2017] |
Title: NETWORKING: CAN COMMUNICATION SYSTEM: Check Bus 2 Line for Short to GND; 2018 MY Camry [03/2017 - 06/2017] |
Check Bus 2 Line for Short to GND
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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 central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 17 (CA4L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3.
Symptom
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Trouble Area
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There is no resistance between terminal 18 (CA4H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 17 (CA4L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3.
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-
Short to ground in CAN main bus line
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Central gateway ECU (network gateway ECU)
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ECM
-
No. 2 CAN junction connector
-
No. 4 CAN junction connector
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
-
Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
-
When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
1.
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CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 2 CAN JUNCTION CONNECTOR)
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(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the A67 No. 2 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
*1
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DLC3
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-
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-
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*a
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Front view of wire harness connector
(to No. 2 CAN Junction Connector)
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*b
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to No. 4 CAN Junction Connector
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*c
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to ECM
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-
|
-
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Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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Connected to
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A67-10 (CANH) - K68-4 (CG)
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Cable disconnected from negative (-) battery terminal
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200 Ω or higher
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No. 4 CAN junction connector
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A67-21 (CANL) - K68-4 (CG)
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A67-11 (CANH) - K68-4 (CG)
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Cable disconnected from negative (-) battery terminal
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200 Ω or higher
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ECM
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A67-22 (CANL) - K68-4 (CG)
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Result
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Proceed to
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OK
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A
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NG (Line to ECM)
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B
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NG (Line to No. 4 CAN junction connector)
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C
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A |
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REPLACE NO. 2 CAN JUNCTION CONNECTOR
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B
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|
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2.
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CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 2 CAN JUNCTION CONNECTOR - ECM)
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(a) Disconnect the A24 ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
*1
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DLC3
|
-
|
-
|
*a
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Front view of wire harness connector
(to No. 2 CAN Junction Connector)
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*b
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to ECM
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Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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A67-11 (CANH) - K68-4 (CG)
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Cable disconnected from negative (-) battery terminal
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200 Ω or higher
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A67-22 (CANL) - K68-4 (CG)
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NG |
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REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
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3.
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CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 4 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR)
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(a) Disconnect the K128 No. 4 CAN junction connector.
(b) Measure the resistance according to the value(s) in the table below.
*1
|
DLC3
|
-
|
-
|
*a
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Front view of wire harness connector
(to No. 4 CAN Junction Connector)
|
*b
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to No. 2 CAN Junction Connector
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Standard Resistance:
Tester Connection
|
Condition
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Specified Condition
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Connected to
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K128-11 (CANH) - K68-4 (CG)
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Cable disconnected from negative (-) battery terminal
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200 Ω or higher
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No. 2 CAN junction connector
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K128-22 (CANL) - K68-4 (CG)
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NG |
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REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR)
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OK
|
|
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4.
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CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 4 CAN JUNCTION CONNECTOR)
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(a) Disconnect the K127 No. 4 CAN junction connector.
(b) Measure the resistance according to the value(s) in the table below.
*1
|
DLC3
|
-
|
-
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*a
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Front view of wire harness connector
(to No. 4 CAN Junction Connector)
|
*b
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to Central Gateway ECU (Network Gateway ECU)
|
Standard Resistance:
Tester Connection
|
Condition
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Specified Condition
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Connected to
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K127-1 (CANH) - K68-4 (CG)
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Cable disconnected from negative (-) battery terminal
|
200 Ω or higher
|
Central gateway ECU (network gateway ECU)
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K127-12 (CANL) - K68-4 (CG)
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OK |
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REPLACE NO. 4 CAN JUNCTION CONNECTOR
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NG
|
|
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5.
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CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 4 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
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(a) Disconnect the K76 central gateway ECU (network gateway ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
*1
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DLC3
|
-
|
-
|
*a
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Front view of wire harness connector
(to No. 4 CAN Junction Connector)
|
*b
|
to Central Gateway ECU (Network Gateway ECU)
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Standard Resistance:
Tester Connection
|
Condition
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Specified Condition
|
K127-1 (CANH) - K68-4 (CG)
|
Cable disconnected from negative (-) battery terminal
|
200 Ω or higher
|
K127-12 (CANL) - K68-4 (CG)
|
NG |
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REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
|
|