Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001CBP4 |
Model Year Start: 2019 |
Model: GR Corolla |
Prod Date Range: [06/2018 - 01/2019] |
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): Check Bus 4 Line for Short to +B; 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019] |
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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-
Short to +B in CAN branch line
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Short to +B in CAN branch line
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Central gateway ECU (network gateway ECU)
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Steering sensor
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Airbag sensor assembly
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Occupant Detection ECU
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Power steering ECU with motor assembly
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Brake actuator assembly
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No. 5 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.
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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. 5 CAN JUNCTION CONNECTOR)
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(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the I96 No. 5 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. 5 CAN Junction Connector)
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*b
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to Steering Sensor
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*c
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to Central Gateway ECU (Network Gateway ECU)
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*d
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to Airbag Sensor Assembly
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*e
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to Occupant Detection ECU
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*f
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to Power Steering ECU with Motor Assembly
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*g
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to Brake Actuator Assembly
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-
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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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I96-1 (CANH) - I26-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Steering sensor
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I96-7 (CANL) - I26-16 (BAT)
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I96-2 (CANH) - I26-16 (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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I96-8 (CANL) - I26-16 (BAT)
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I96-3 (CANH) - I26-16 (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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I96-9 (CANL) - I26-16 (BAT)
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I96-4 (CANH) - I26-16 (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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I96-10 (CANL) - I26-16 (BAT)
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I96-5 (CANH) - I26-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Power steering ECU with motor assembly
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I96-11 (CANL) - I26-16 (BAT)
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I96-6 (CANH) - I26-16 (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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I96-12 (CANL) - I26-16 (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 central gateway ECU (network gateway ECU))
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B
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NG (Line to ECU or sensor)
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C
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A |
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REPLACE NO. 5 CAN 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. 5 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
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(a) Disconnect the I53 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
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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. 5 CAN Junction Connector)
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*b
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to Central Gateway ECU (Network Gateway ECU)
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Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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I96-2 (CANH) - I26-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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I96-8 (CANL) - I26-16 (BAT)
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NG |
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REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 5 CAN 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 (ECU OR SENSOR)
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(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.
*1
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DLC3
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-
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-
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*a
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Component with harness connected
(Central Gateway ECU (Network Gateway ECU))
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-
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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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I53-22 (CA2H) - I26-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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I53-7 (CA2L) - I26-16 (BAT)
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HINT:
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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.
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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 |
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REPLACE ECU OR SENSOR
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NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
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