Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001O5YO |
Model Year Start: 2021 |
Model: Corolla |
Prod Date Range: [04/2020 - 09/2022] |
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): ECM Communication Stop Mode; 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022] |
ECM 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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ECM Communication Stop Mode
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Any of the following conditions are met:
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Communication stop for "ECM (Engine)" is indicated on the "Communication Bus Check" screen of the Techstream.
Click here
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Communication stop history for "ECM (Engine)" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "ECM (Engine)" is 6 or more.)
Click here
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Communication system DTCs (DTCs that start with U) that correspond to "ECM Communication Stop Mode" in "DTC Combination Table" are output.
Click here
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ECM main line or connector
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ECM branch line or connector
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Power source circuit of ECM
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ECM ground circuit
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ECM
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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 OPEN IN CAN BUS LINES (ECM MAIN LINE AND BRANCH LINE)
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(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the A46 and C77 ECM connectors.
(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 ECM)
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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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A46-13 (CANH) - A46-26 (CANL)
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Cable disconnected from negative (-) auxiliary battery terminal
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108 to 132 Ω
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C77-31 (CAN+) - C77-32 (CAN-)
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Cable disconnected from negative (-) auxiliary battery terminal
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54 to 69 Ω
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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 (No. 2 CAN junction connector main line)
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B
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NG (No. 5 CAN junction connector branch line)
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C
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B |
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REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (ECM)
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C |
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REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (ECM)
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A
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|
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2.
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CHECK ECM POWER SOURCE CIRCUIT
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(a) Check the ECM power source circuit.
Click here
NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
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