Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001GMB8 |
Model Year Start: 2020 |
Model: GR Corolla |
Prod Date Range: [01/2019 - 09/2019] |
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): Check Bus 3 Lines for Short Circuit; 2020 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2019] |
Check Bus 3 Lines for Short Circuit
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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
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Trouble Area
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Resistance between terminals 6 (CA3H) and 21 (CA3L) of the central gateway ECU (network gateway ECU) is below 54 Ω.
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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
(a) Check vehicle type.
Result
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Proceed to
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for Hatchback
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A
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for Sedan
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B
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A
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|
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2.
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CHECK FOR SHORT IN CAN BUS LINES (NO. 4 CAN JUNCTION CONNECTOR)
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(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the I95 No. 4 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
*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 Central Gateway ECU (Network Gateway ECU)
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*c
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to DCM (Telematics Transceiver)
(w/ Telematics Transceiver)
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*d
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to Radio and Display Receiver Assembly
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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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I95-1 (CANH) - I95-12 (CANL)
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Cable disconnected from negative (-) battery terminal
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108 to 132 Ω
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Central gateway ECU (network gateway ECU)
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I95-2 (CANH) - I95-13 (CANL)
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Cable disconnected from negative (-) battery terminal
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108 to 132 Ω
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Central gateway ECU (network gateway ECU)
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I95-3 (CANH) - I95-14 (CANL)
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Cable disconnected from negative (-) battery terminal
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200 Ω or higher
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DCM (telematics transceiver)*
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I95-4 (CANH) - I95-15 (CANL)
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Cable disconnected from negative (-) battery terminal
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200 Ω or higher
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Radio and display receiver assembly
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-
*: w/ Telematics Transceiver
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. 4 CAN JUNCTION CONNECTOR
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B
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|
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3.
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CHECK FOR SHORT IN CAN BUS LINES (NO. 4 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.
*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 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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I95-1 (CANH) - I95-12 (CANL)
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Cable disconnected from negative (-) battery terminal
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1 MΩ or higher
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I95-2 (CANH) - I95-13 (CANL)
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Cable disconnected from negative (-) battery terminal
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1 MΩ or higher
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NG |
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REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
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4.
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CHECK FOR SHORT IN CAN BUS LINES (NO. 6 CAN JUNCTION CONNECTOR)
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(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the I132 No. 6 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
*a
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Front view of wire harness connector
(to No. 6 CAN Junction Connector)
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*b
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to Central Gateway ECU (Network Gateway ECU)
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*c
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to DCM (Telematics Transceiver)
(w/ Telematics Transceiver)
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*d
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to Radio and Display Receiver Assembly
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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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I132-1 (CANH) - I132-12 (CANL)
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Cable disconnected from negative (-) battery terminal
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108 to 132 Ω
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Central gateway ECU (network gateway ECU)
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I132-2 (CANH) - I132-13 (CANL)
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Cable disconnected from negative (-) battery terminal
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108 to 132 Ω
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Central gateway ECU (network gateway ECU)
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I132-3 (CANH) - I132-14 (CANL)
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Cable disconnected from negative (-) battery terminal
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200 Ω or higher
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DCM (telematics transceiver)*
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I132-4 (CANH) - I132-15 (CANL)
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Cable disconnected from negative (-) battery terminal
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200 Ω or higher
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Radio and display receiver assembly
|
-
*: w/ Telematics Transceiver
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 ECU or sensor)
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C
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A |
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REPLACE NO. 6 CAN JUNCTION CONNECTOR
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B
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5.
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CHECK FOR SHORT IN CAN BUS LINES (NO. 6 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.
*a
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Front view of wire harness connector
(to No. 6 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
|
I132-1 (CANH) - I132-12 (CANL)
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Cable disconnected from negative (-) battery terminal
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1 MΩ or higher
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I132-2 (CANH) - I132-13 (CANL)
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Cable disconnected from negative (-) battery terminal
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1 MΩ or higher
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NG |
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REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
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6.
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CHECK FOR SHORT IN CAN BUS LINES (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 short circuited branch line is connected.
Click here
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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I53-6 (CA3H) - I53-21 (CA3L)
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Cable disconnected from negative (-) battery terminal
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54 to 69 Ω
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HINT:
-
If the resistance becomes normal (between 54 and 69 Ω) 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 in the wire harness and repair or replace the wire harness or connector if necessary.
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*a
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Component with harness connected
(Central Gateway ECU (Network Gateway ECU))
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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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