ECM Communication Stop Mode [09/2022 - 11/2022]: Procedure
WARNING: This page is about a different car, the 2023 Toyota GR Corolla and 2023 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK VEHICLE TYPE
Result:
B
See step 4
Result:
A
See step 2
- CHECK FOR OPEN IN CAN BUS LINES (ECM MAIN LINE)
- Disconnect the cable from the negative (-) battery terminal.
- Disconnect the A47 ECM connector.
- Measure the resistance according to the value(s) in the table below.
*a Front view of wire harness connector
(to ECM)Standard Resistance
Tester Connection Condition Specified Condition A47-8 (CANH) - A47-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Result
Result OK NG
Result:
NG
REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (ECM)
Result:
OK
See step 3
- CHECK ECM POWER SOURCE CIRCUIT
- Check the ECM power source circuit.
Refer to ECM Power Source Circuit [09/2022 - 11/2022]
Result
Result OK NG
Result:
OK
REPLACE ECM
Refer to REMOVAL [09/2022 - 11/2022]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
- Check the ECM power source circuit.
- CHECK FOR OPEN IN CAN BUS LINES (ECM MAIN LINE)
- Disconnect the cable from the negative (-) battery terminal.
- Disconnect the A46 ECM connector.
- Measure the resistance according to the value(s) in the table below.
*a Front view of wire harness connector
(to ECM)Standard Resistance
Tester Connection Condition Specified Condition A46-13 (CANH) - A46-26 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Result
Result OK NG
Result:
NG
REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (ECM)
Result:
OK
See step 5
- CHECK ECM POWER SOURCE CIRCUIT
- Check the ECM power source circuit.
Refer to ECM Power Source Circuit [09/2022 - 11/2022]
Result
Result OK NG
Result:
OK
REPLACE ECM
Refer to REMOVAL [09/2022 - 11/2022]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
- Check the ECM power source circuit.