Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001CBOF |
Model Year Start: 2019 |
Model: GR Corolla |
Prod Date Range: [06/2018 - 01/2019] |
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): Main Body ECU Communication Stop Mode; 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019] |
Main Body ECU Communication Stop Mode
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DESCRIPTION
Detection Item
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Symptom
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Trouble Area
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Main Body ECU Communication Stop Mode
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Any of the following conditions are met:
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Communication stop for "Main Body" is indicated on the "Communication Bus Check" screen of the Techstream.
Click here
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Communication stop history for "Main Body" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Main Body" is 6 or more.)
Click here
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Communication system DTCs (DTCs that start with U) that correspond to "Main Body ECU Communication Stop Mode" in "DTC Combination Table" are output.
Click here
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Main body ECU (multiplex network body ECU) branch line or connector
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Power source circuit of main body ECU (multiplex network body ECU) or instrument panel junction block assembly
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Main body ECU (multiplex network body ECU) or instrument panel junction block assembly ground circuit
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Main body ECU (multiplex network body ECU) or instrument panel junction block assembly
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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 OPEN IN CAN BUS LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH LINE)
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(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the I85 main body ECU (multiplex network body ECU) connector.
(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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I85-5 (CANH) - I85-4 (CANL)
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Cable disconnected from negative (-) battery terminal
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54 to 69 Ω
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|
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*a
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Front view of wire harness connector
(to Main Body ECU (Multiplex Network Body ECU))
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|
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NG |
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REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))
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OK
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2.
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CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
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(a) Remove the main body ECU (multiplex network body ECU).
Click here
(b) 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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MB-11 (GND1) - Body ground
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Cable disconnected from negative (-) battery terminal
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Below 1 Ω
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NOTICE:
Perform this inspection with the wire harness connected to the instrument panel junction block assembly.
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*a
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Front view of wire harness connector
(to Main Body ECU (Multiplex Network Body ECU))
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|
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(c) Reconnect the cable to the negative (-) battery terminal.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
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Condition
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Specified Condition
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MB-30 (ACC) - Body ground
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Engine switch on (ACC)
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11 to 14 V
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MB-31 (BECU) - Body ground
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Always
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11 to 14 V
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MB-32 (IG) - Body ground
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Engine switch on (IG)
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11 to 14 V
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NOTICE:
Perform this inspection with the wire harness connected to the instrument panel junction block assembly.
Result
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Proceed to
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OK
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A
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NG (BECU)
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B
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NG (ACC)
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C
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NG (IG)
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D
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NG (GND1)
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E
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B
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3.
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CHECK HARNESS AND CONNECTOR (BECU SIGNAL CIRCUIT)
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(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the 4B instrument panel junction block assembly connector.
(c) Reconnect the cable to the negative (-) battery terminal.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
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Condition
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Specified Condition
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4B-1 - Body ground
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Always
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11 to 14 V
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|
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*a
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Front view of wire harness connector
(to Instrument Panel Junction Block Assembly)
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|
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NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR (BECU SIGNAL CIRCUIT)
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4.
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CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)
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(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the 4F instrument panel junction block assembly connector.
(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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4F-3 - Body ground
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Cable disconnected from negative (-) battery terminal
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Below 1 Ω
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*a
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Front view of wire harness connector
(to Instrument Panel Junction Block Assembly)
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|
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NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)
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