Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000028ELA |
Model Year Start: 2023 |
Model: Corolla Hatchback |
Prod Date Range: [11/2022 -
] |
Title: K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: ECU Power Source Circuit; 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 - ] |
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 NO. 1 relay. This causes the EFI-MAIN NO. 1 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)
|
(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
|
OK
|
|
|
2.
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INSPECT ECU TERMINAL VOLTAGE (+B TERMINAL)
|
(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
|
Specified Condition
|
C80-1 (+B) - Body ground
|
Engine switch on (IG)
|
11 to 14 V
|
(d) Connect the C80 TCM connector.
Result
|
Proceed to
|
OK
|
A
|
NG
|
B
|
B
|
|
|
3.
|
CHECK HARNESS AND CONNECTOR (TCM - EFI-MAIN NO. 1 RELAY)
|
(a) Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Disconnect the C80 TCM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
C80-1 (+B) - 3 (EFI-MAIN NO. 1 relay)
|
Always
|
Below 1 Ω
|
C80-1 (+B) or 3 (EFI-MAIN NO. 1 relay) - Body ground
|
Always
|
10 kΩ or higher
|
(d) Connect the C80 TCM connector.
(e) Install the EFI-MAIN NO. 1 relay to the No. 1 engine room relay block and No. 1 junction block assembly.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|