Last Modified: 11-20-2023 |
6.11:8.1.0 |
Doc ID: RM100000001532Q |
Model Year Start: 2018 |
Model: Camry |
Prod Date Range: [06/2017 - 09/2019] |
Title: NETWORKING: CAN COMMUNICATION SYSTEM: Check Bus 4 Line for Short to +B; 2018 - 2019 MY Camry [06/2017 - 09/2019] |
Check Bus 4 Line for Short to +B
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DESCRIPTION
There may be a short circuit between one of the CAN bus lines and +B when there is no resistance between terminal 22 (CA2H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 7 (CA2L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.
Symptom
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Trouble Area
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There is no resistance between terminal 22 (CA2H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 7 (CA2L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) 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.
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 +B IN CAN BUS LINE (NO. 3 JUNCTION CONNECTOR)
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(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the R99 No. 3 junction connector.
(c) Measure the resistance according to the value(s) in the table below.
*A
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Before Jul. 2018 Production
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*B
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From Jul. 2018 Production
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*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. 3 Junction Connector)
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*b
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to Tire Pressure Warning ECU and Receiver
(for Tire Pressure Warning System with Tire Inflation Pressure Display Function)
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*c
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to Occupant Detection ECU
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*d
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to Central Gateway ECU (Network Gateway ECU)
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*e
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to No. 2 CAN Junction Connector
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-
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-
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Standard Resistance:
Before Jul. 2018 Production:
Tester Connection
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Condition
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Specified Condition
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Connected to
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R99-8 (CANH) - K68-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Tire pressure warning ECU and receiver*
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R99-19 (CANL) - K68-16 (BAT)
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R99-9 (CANH) - K68-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Occupant detection ECU
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R99-20 (CANL) - K68-16 (BAT)
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R99-10 (CANH) - K68-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Central gateway ECU (network gateway ECU)
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R99-21 (CANL) - K68-16 (BAT)
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R99-11 (CANH) - K68-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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No. 2 CAN junction connector
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R99-22 (CANL) - K68-16 (BAT)
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From Jul. 2018 Production:
Tester Connection
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Condition
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Specified Condition
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Connected to
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R99-8 (CANH) - K138-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Tire pressure warning ECU and receiver*
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R99-19 (CANL) - K138-16 (BAT)
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R99-9 (CANH) - K138-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Occupant detection ECU
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R99-20 (CANL) - K138-16 (BAT)
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R99-10 (CANH) - K138-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Central gateway ECU (network gateway ECU)
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R99-21 (CANL) - K138-16 (BAT)
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R99-11 (CANH) - K138-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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No. 2 CAN junction connector
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R99-22 (CANL) - K138-16 (BAT)
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-
*: for Tire Pressure Warning System with Tire Inflation Pressure Display Function
Result
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Proceed to
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OK
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A
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NG (Line to central gateway ECU (network gateway ECU))
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B
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NG (Line to No. 2 CAN junction connector)
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C
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NG (Line to ECU or sensor)
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D
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A |
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REPLACE NO. 3 JUNCTION CONNECTOR
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B
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2.
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CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 3 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.
*A
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Before Jul. 2018 Production
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*B
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From Jul. 2018 Production
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*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. 3 Junction Connector)
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*b
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to Central Gateway ECU (Network Gateway ECU)
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Standard Resistance:
Before Jul. 2018 Production:
Tester Connection
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Condition
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Specified Condition
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R99-10 (CANH) - K68-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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R99-21 (CANL) - K68-16 (BAT)
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From Jul. 2018 Production:
Tester Connection
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Condition
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Specified Condition
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R99-10 (CANH) - K138-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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R99-21 (CANL) - K138-16 (BAT)
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NG |
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REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
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3.
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CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 2 CAN JUNCTION CONNECTOR)
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(a) Disconnect the A67 No. 2 CAN junction connector.
(b) Measure the resistance according to the value(s) in the table below.
*A
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Before Jul. 2018 Production
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*B
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From Jul. 2018 Production
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*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 Brake Actuator Assembly
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*c
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to No. 3 Junction Connector
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*d
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to Rack and Pinion Power Steering Gear Assembly
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*e
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to No. 4 CAN Junction Connector
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-
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-
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Standard Resistance:
Before Jul. 2018 Production:
Tester Connection
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Condition
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Specified Condition
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Connected to
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A67-1 (CANH) - K68-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Brake actuator assembly
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A67-12 (CANL) - K68-16 (BAT)
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A67-2 (CANH) - K68-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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No. 3 junction connector
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A67-13 (CANL) - K68-16 (BAT)
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A67-4 (CANH) - K68-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Rack and pinion power steering gear assembly
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A67-15 (CANL) - K68-16 (BAT)
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A67-5 (CANH) - K68-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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No. 4 CAN junction connector
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A67-16 (CANL) - K68-16 (BAT)
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From Jul. 2018 Production:
Tester Connection
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Condition
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Specified Condition
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Connected to
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A67-1 (CANH) - K138-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
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Brake actuator assembly
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A67-12 (CANL) - K138-16 (BAT)
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A67-2 (CANH) - K138-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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No. 3 junction connector
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A67-13 (CANL) - K138-16 (BAT)
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A67-4 (CANH) - K138-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Rack and pinion power steering gear assembly
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A67-15 (CANL) - K138-16 (BAT)
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A67-5 (CANH) - K138-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
|
No. 4 CAN junction connector
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A67-16 (CANL) - K138-16 (BAT)
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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 No. 3 junction connector)
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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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NG (Line to ECU or sensor)
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D
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A |
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REPLACE NO. 2 CAN JUNCTION CONNECTOR
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B |
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REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)
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C
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4.
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CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 4 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.
*A
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Before Jul. 2018 Production
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*B
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From Jul. 2018 Production
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*1
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DLC3
|
-
|
-
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*a
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Front view of wire harness connector
(to No. 4 CAN Junction Connector)
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*b
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to Airbag Sensor Assembly
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Standard Resistance:
Before Jul. 2018 Production:
Tester Connection
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Condition
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Specified Condition
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Connected to
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K128-6 (CANH) - K68-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Airbag sensor assembly
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K128-17 (CANL) - K68-16 (BAT)
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From Jul. 2018 Production:
Tester Connection
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Condition
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Specified Condition
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Connected to
|
K128-6 (CANH) - K138-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
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Airbag sensor assembly
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K128-17 (CANL) - K138-16 (BAT)
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OK
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|
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5.
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CHECK FOR SHORT TO +B 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.
*A
|
Before Jul. 2018 Production
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*B
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From Jul. 2018 Production
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*1
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DLC3
|
-
|
-
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*a
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Front view of wire harness connector
(to No. 4 CAN Junction Connector)
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*b
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to No. 2 CAN Junction Connector
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*c
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to Steering Sensor
|
-
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-
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Standard Resistance:
Before Jul. 2018 Production:
Tester Connection
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Condition
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Specified Condition
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Connected to
|
K127-6 (CANH) - K68-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
No. 2 CAN junction connector
|
K127-17 (CANL) - K68-16 (BAT)
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K127-7 (CANH) - K68-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
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Steering sensor
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K127-18 (CANL) - K68-16 (BAT)
|
From Jul. 2018 Production:
Tester Connection
|
Condition
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Specified Condition
|
Connected to
|
K127-6 (CANH) - K138-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
No. 2 CAN junction connector
|
K127-17 (CANL) - K138-16 (BAT)
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K127-7 (CANH) - K138-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
Steering sensor
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K127-18 (CANL) - K138-16 (BAT)
|
Result
|
Proceed to
|
OK
|
A
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NG (Line to No. 2 CAN junction connector)
|
B
|
NG (Line to ECU or sensor)
|
C
|
A |
|
REPLACE NO. 4 CAN JUNCTION CONNECTOR
|
B |
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REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR)
|
6.
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CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 4 CAN JUNCTION CONNECTOR - AIRBAG SENSOR ASSEMBLY)
|
(a) Disconnect the K73 airbag sensor assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
*A
|
Before Jul. 2018 Production
|
*B
|
From Jul. 2018 Production
|
*1
|
DLC3
|
-
|
-
|
*a
|
Front view of wire harness connector
(to No. 4 CAN Junction Connector)
|
*b
|
to Airbag Sensor Assembly
|
Standard Resistance:
Before Jul. 2018 Production:
Tester Connection
|
Condition
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Specified Condition
|
K128-6 (CANH) - K68-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
K128-17 (CANL) - K68-16 (BAT)
|
From Jul. 2018 Production:
Tester Connection
|
Condition
|
Specified Condition
|
K128-6 (CANH) - K138-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
K128-17 (CANL) - K138-16 (BAT)
|
NG |
|
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - AIRBAG SENSOR ASSEMBLY)
|
7.
|
CHECK FOR SHORT TO +B IN CAN BUS LINE (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 bus line shorted to +B is connected.
Click here
(c) Measure the resistance according to the value(s) in the table below.
*A
|
Before Jul. 2018 Production
|
*B
|
From Jul. 2018 Production
|
*1
|
DLC3
|
-
|
-
|
*a
|
Component with harness connected
(Central Gateway ECU (Network Gateway ECU))
|
-
|
-
|
Standard Resistance:
Before Jul. 2018 Production:
Tester Connection
|
Condition
|
Specified Condition
|
K76-22 (CA2H) - K68-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
K76-7 (CA2L) - K68-16 (BAT)
|
From Jul. 2018 Production:
Tester Connection
|
Condition
|
Specified Condition
|
K76-22 (CA2H) - K138-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
K76-7 (CA2L) - K138-16 (BAT)
|
HINT:
-
If the resistance changes to 6 kΩ or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
-
If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short to +B in the wire harness and repair or replace the wire harness or connector if necessary.
OK |
|
REPLACE ECU OR SENSOR
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|