Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001GMB6 |
Model Year Start: 2020 |
Model: GR Corolla |
Prod Date Range: [01/2019 - 09/2022] |
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): Check Bus 2 Line for Short to GND; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022] |
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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Short to ground in CAN branch line
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Central gateway ECU (network gateway ECU)
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ECM
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Transmission control ECU
(for CVT (K120))
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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. 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.
*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. 4 CAN Junction Connector)
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*b
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to Transmission Control ECU
(for Hatchback and CVT (K120))
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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 ECM
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*e
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to Transmission Control ECU
(for Sedan and CVT (K120))
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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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I95-8 (CANH) - I26-4 (CG)
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Cable disconnected from negative (-) battery terminal
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200 Ω or higher
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Transmission control ECU*1
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I95-19 (CANL) - I26-4 (CG)
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I95-9 (CANH) - I26-4 (CG)
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Cable disconnected from negative (-) battery terminal
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200 Ω or higher
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Central gateway ECU (network gateway ECU)
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I95-20 (CANL) - I26-4 (CG)
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I95-10 (CANH) - I26-4 (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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I95-21 (CANL) - I26-4 (CG)
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I95-11 (CANH) - I26-4 (CG)
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Cable disconnected from negative (-) battery terminal
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200 Ω or higher
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Transmission control ECU*2
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I95-22 (CANL) - I26-4 (CG)
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-
*1: for Hatchback and CVT (K120)
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*2: for Sedan and CVT (K120)
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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2.
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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 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. 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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I95-9 (CANH) - I26-4 (CG)
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Cable disconnected from negative (-) battery terminal
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200 Ω or higher
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I95-20 (CANL) - I26-4 (CG)
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NG |
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REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
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3.
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CHECK FOR SHORT TO GND 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 GND 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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I53-18 (CA4H) - I26-4 (CG)
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Cable disconnected from negative (-) battery terminal
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200 Ω or higher
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I53-17 (CA4L) - I26-4 (CG)
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HINT:
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If the resistance changes to 200 Ω 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 ground 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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