Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GYSP
Model Year Start: 2020 Model: Corolla Hatchback Prod Date Range: [01/2019 - 11/2022]
Title: K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P099B,P099C; Shift Solenoid "G" Control Circuit Low (Shift Solenoid Valve SC); 2020 - 2023 MY Corolla Corolla Hatchback [01/2019 - 11/2022]

DTC

P099B

Shift Solenoid "G" Control Circuit Low (Shift Solenoid Valve SC)

DTC

P099C

Shift Solenoid "G" Control Circuit High (Shift Solenoid Valve SC)

DESCRIPTION

Based on the signal received by the shift solenoid valve SC, the ECM uses the shift solenoid valve SLU to control the forward and reverse clutch pressure.

If there is an open or short in the shift solenoid valve SC circuit, the ECM stops sending current to the malfunctioning shift solenoid valve.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P099B

Shift Solenoid "G" Control Circuit Low (Shift Solenoid Valve SC)

While the vehicle is driven, there is a short in the shift solenoid valve SC circuit for 3 seconds (1-trip detection logic).

  • Wire harness or connector
  • Continuously variable transaxle assembly (Shift solenoid valve SC)
  • ECM

Comes on

DTC stored

P099C

Shift Solenoid "G" Control Circuit High (Shift Solenoid Valve SC)

While the vehicle is driven, there is an open or short to +B in the shift solenoid valve SC circuit for 0.5 seconds (1-trip detection logic).

  • Wire harness or connector
  • Continuously variable transaxle assembly (Shift solenoid valve SC)
  • ECM

Comes on

DTC stored

MONITOR DESCRIPTION

These DTCs indicate an open or short in the shift solenoid valve SC circuit. If there is an open or short in the shift solenoid valve SC circuit, the ECM detects the malfunction, illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P099B: Shift solenoid valve SC / Range check

P099C: Shift solenoid valve SC / Range check

Required sensors/Components

Continuously variable transaxle assembly

(Shift solenoid valve SC)

Frequency of operation

Continuous

Duration

1 time

MIL operation

Immediately

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present

None

Battery voltage

8 V or more

Time after battery voltage is 8 V or more

0.5 seconds or more

Write inhibit

Permit

Time after write status forbiddance to permit

0.5 seconds or more

Ignition switch

ON

Time after ignition switch OFF to ON

0.5 seconds or more

Starter

OFF

Time after starter ON to OFF

0.5 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

P099B:

All of the following conditions are met:

3 seconds or more

Command to solenoid

ON

Time after command to solenoid OFF to ON

0.008192 seconds or more

Solenoid terminal voltage level (Shift solenoid valve SC)

Low

P099C:

All of the following conditions are met:

0.5 seconds or more

Command to solenoid

OFF

Time after command to solenoid ON to OFF

0.008192 seconds or more

Solenoid terminal voltage level (Shift solenoid valve SC)

High

COMPONENT OPERATING RANGE

Shift solenoid valve SC

Resistance: 11 to 15 Ω at 20°C (68°F)

CONFIRMATION DRIVING PATTERN

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

  • After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
  • When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.

    Click here 2020 - 2023 MY Corolla Corolla Hatchback [01/2019 - 11/2022]; K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off and wait for 2 minutes or more.
  5. Turn the ignition switch to ON and turn the Techstream on.
  6. Start the engine.
  7. Drive the vehicle and confirm the lock-up on and off conditions according to Road Test. [*1]

    Click here 2020 MY Corolla Corolla Hatchback [01/2019 - 03/2019]; K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: ROAD TEST 2020 - 2023 MY Corolla Corolla Hatchback [03/2019 - 11/2022]; K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: ROAD TEST

    HINT:

    [*1]: Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  8. Stop the vehicle.
  9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  10. Input the DTC: P099B or P099C.
  11. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A

    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Perform the universal trip to clear permanent DTCs.

    Click here 2020 - 2023 MY Corolla Corolla Hatchback [01/2019 - 11/2022]; K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR

  • Perform initialization when parts related to the continuously variable transaxle system are replaced.

    Click here 2020 - 2023 MY Corolla Corolla Hatchback [01/2019 - 11/2022]; K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: INITIALIZATION

  • Check that no DTCs are stored after performing initialization.

    Click here 2020 - 2023 MY Corolla Corolla Hatchback [01/2019 - 11/2022]; K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR

PROCEDURE

1.

INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SC)

(a) Disconnect the C60 transmission wire connector.

*a

Component without harness connected

(Transmission Wire)

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

9 (SC) - Body ground

20°C (68°F)

11 to 15 Ω

(c) Connect the C60 transmission wire connector.

NG

GO TO STEP 4

OK

2.

CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

(a) Disconnect the C77 ECM connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

C77-41 (SC) - Body ground

20°C (68°F)

11 to 15 Ω

(c) Connect the C77 ECM connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM)

OK

3.

REPLACE ECM

(a) Replace the ECM.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): ECM: COMPONENTS

NEXT

PERFORM INITIALIZATION

4.

REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY

(a) Replace the continuously variable transaxle assembly.

Click here 2020 - 2023 MY Corolla Corolla Hatchback [01/2019 - 11/2022]; K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY: COMPONENTS

NEXT

PERFORM INITIALIZATION