Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001D0YQ |
Model Year Start: 2019 |
Model: Corolla Hatchback |
Prod Date Range: [06/2018 - 09/2022] |
Title: K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: ECU Power Source Circuit; 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022] |
DESCRIPTION
When the engine switch is turned on (IG), battery voltage is applied to terminal MREL of the ECM through the coil of the EFI-MAIN relay. This causes the EFI-MAIN relay to close, which supplies power to terminal +B of the TCM.
WIRING DIAGRAM
Refer to DTC U010087.
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CAUTION / NOTICE / HINT
NOTICE:
-
Inspect the fuses for circuits related to this system before performing the following procedure.
-
Perform registration and/or initialization when parts related to the continuously variable transaxle system are replaced.
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PROCEDURE
1.
|
CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND)
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(a) Disconnect the C80 TCM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
C80-2 (E1) - Body ground
|
Always
|
Below 1 Ω
|
(c) Connect the C80 TCM connector.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
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OK
|
|
|
2.
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INSPECT ECU TERMINAL VOLTAGE (+B TERMINAL)
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(a) Disconnect the C80 TCM connector.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
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Specified Condition
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C80-1 (+B) - Body ground
|
Engine switch on (IG)
|
11 to 14 V
|
(d) Connect the C80 TCM connector.
NG
|
|
|
3.
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CHECK HARNESS AND CONNECTOR (TCM - NO. 1 INTEGRATION RELAY)
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(a) Disconnect the 1B No. 1 integration relay connector.
(b) Disconnect the C80 TCM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
Tester Connection
|
Condition
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Specified Condition
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C80-1 (+B) - 1B-4
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Always
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Below 1 Ω
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C80-1 (+B) or 1B-4 - Body ground
|
Always
|
10 kΩ or higher
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(d) Connect the C80 TCM connector.
(e) Connect the 1B No. 1 integration relay connector.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|