Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001CBOP |
Model Year Start: 2019 |
Model: GR Corolla |
Prod Date Range: [06/2018 - 01/2019] |
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): Check Bus 1 Line for Short to +B; 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019] |
Check Bus 1 Line for Short to +B
|
DESCRIPTION
There may be a short circuit between one of the CAN bus lines and +B when there is no resistance between terminal 23 (CA1H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 8 (CA1L) 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 23 (CA1H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 8 (CA1L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.
|
-
Short to +B in CAN main bus line
-
Short to +B in CAN branch line
-
Central gateway ECU (network gateway ECU)
-
Forward recognition camera
-
Millimeter wave radar sensor assembly
-
Blind spot monitor sensor LH
(w/ Blind Spot Monitor System)
-
No. 1 CAN junction connector
-
No. 1 junction connector
(w/ Blind Spot Monitor System)
-
CAN junction terminal
(w/ Blind Spot Monitor System)
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WIRING DIAGRAM
w/ Blind Spot Monitor System
w/o Blind Spot Monitor System
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
(a) Check vehicle type.
Result
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Proceed to
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w/ Blind Spot Monitor System
|
A
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w/o Blind Spot Monitor System
|
B
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A
|
|
|
2.
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CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR)
|
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the I91 No. 1 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
*1
|
DLC3
|
-
|
-
|
*a
|
Front view of wire harness connector
(to No. 1 CAN Junction Connector)
|
*b
|
to Central Gateway ECU (Network Gateway ECU)
|
*c
|
to Millimeter Wave Radar Sensor Assembly
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*d
|
to Forward Recognition Camera
|
*e
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to No. 1 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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I91-1 (CANH) - I26-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
Central gateway ECU (network gateway ECU)
|
I91-7 (CANL) - I26-16 (BAT)
|
I91-4 (CANH) - I26-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
Millimeter wave radar sensor assembly
|
I91-10 (CANL) - I26-16 (BAT)
|
I91-5 (CANH) - I26-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
Forward recognition camera
|
I91-11 (CANL) - I26-16 (BAT)
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I91-6 (CANH) - I26-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
No. 1 junction connector
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I91-12 (CANL) - I26-16 (BAT)
|
Result
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Proceed to
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OK
|
A
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NG (Line to central gateway ECU (network gateway ECU))
|
B
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NG (Line to No. 1 junction connector)
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C
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NG (Line to ECU or sensor)
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D
|
A |
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REPLACE NO. 1 CAN JUNCTION CONNECTOR
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B
|
|
|
3.
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CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
|
(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
|
DLC3
|
-
|
-
|
*a
|
Front view of wire harness connector
(to No. 1 CAN Junction Connector)
|
*b
|
to Central Gateway ECU (Network Gateway ECU)
|
Standard Resistance:
Tester Connection
|
Condition
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Specified Condition
|
I91-1 (CANH) - I26-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
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I91-7 (CANL) - I26-16 (BAT)
|
NG |
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REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
|
4.
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CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 1 JUNCTION CONNECTOR)
|
(a) Disconnect the O101 No. 1 junction connector.
(b) Measure the resistance according to the value(s) in the table below.
*1
|
DLC3
|
-
|
-
|
*a
|
Front view of wire harness connector
(to No. 1 Junction Connector)
|
*b
|
to No. 1 CAN Junction Connector
|
*c
|
to Blind Spot Monitor Sensor LH
|
*d
|
to CAN Junction Terminal
|
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
Connected to
|
O101-1 (CANH) - I26-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
No. 1 CAN junction connector
|
O101-12 (CANL) - I26-16 (BAT)
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O101-2 (CANH) - I26-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
Blind spot monitor sensor LH
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O101-13 (CANL) - I26-16 (BAT)
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O101-3 (CANH) - I26-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
CAN junction terminal
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O101-14 (CANL) - I26-16 (BAT)
|
Result
|
Proceed to
|
OK
|
A
|
NG (Line to No. 1 CAN junction connector)
|
B
|
NG (Line to ECU or sensor)
|
C
|
A |
|
REPLACE NO. 1 JUNCTION CONNECTOR
|
B |
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REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR)
|
5.
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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.
*1
|
DLC3
|
-
|
-
|
*a
|
Component with harness connected
(Central Gateway ECU (Network Gateway ECU))
|
-
|
-
|
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I53-23 (CA1H) - I26-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
I53-8 (CA1L) - I26-16 (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
|
6.
|
CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR)
|
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the I91 No. 1 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
*1
|
DLC3
|
-
|
-
|
*a
|
Front view of wire harness connector
(to No. 1 CAN Junction Connector)
|
*b
|
to Central Gateway ECU (Network Gateway ECU)
|
*c
|
to Millimeter Wave Radar Sensor Assembly
|
*d
|
to Forward Recognition Camera
|
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
Connected to
|
I91-1 (CANH) - I26-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
Central gateway ECU (network gateway ECU)
|
I91-7 (CANL) - I26-16 (BAT)
|
I91-4 (CANH) - I26-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
Millimeter wave radar sensor assembly
|
I91-10 (CANL) - I26-16 (BAT)
|
I91-5 (CANH) - I26-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
Forward recognition camera
|
I91-11 (CANL) - I26-16 (BAT)
|
I91-6 (CANH) - I26-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
Central gateway ECU (network gateway ECU)
|
I91-12 (CANL) - I26-16 (BAT)
|
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. 1 CAN JUNCTION CONNECTOR
|
B
|
|
|
7.
|
CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
|
(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
|
DLC3
|
-
|
-
|
*a
|
Front view of wire harness connector
(to No. 1 CAN Junction Connector)
|
*b
|
to Central Gateway ECU (Network Gateway ECU)
|
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I91-1 (CANH) - I26-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
I91-7 (CANL) - I26-16 (BAT)
|
I91-6 (CANH) - I26-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
I91-12 (CANL) - I26-16 (BAT)
|
NG |
|
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
|
8.
|
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.
*1
|
DLC3
|
-
|
-
|
*a
|
Component with harness connected
(Central Gateway ECU (Network Gateway ECU))
|
-
|
-
|
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I53-23 (CA1H) - I26-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
I53-8 (CA1L) - I26-16 (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
|
|