Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001HTNA
Model Year Start: 2020 Model: Corolla Hatchback Prod Date Range: [03/2019 - 11/2022]
Title: M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P26AC11,P26AC15; Engine Coolant Bypass Valve "B" Circuit Short to Ground; 2020 - 2023 MY Corolla Corolla Hatchback [03/2019 - 11/2022]

DTC

P26AC11

Engine Coolant Bypass Valve "B" Circuit Short to Ground

DTC

P26AC15

Engine Coolant Bypass Valve "B" Circuit Short to Battery or Open

DESCRIPTION

The flow shutting valve (for continuously variable transaxle fluid control) used for the variable cooling system is a magnet type valve that is closed when the engine is warming up to prevent coolant from flowing through the continuously variable transaxle cooler passage which reduces engine warm up time.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P26AC11

Engine Coolant Bypass Valve "B" Circuit Short to Ground

All of the following conditions are met (1 trip detection logic).

  • An open signal is being sent from the ECM to the flow shutting valve (for continuously variable transaxle fluid control).
  • Current operating state and target operating state differ for 3 seconds or more continuously.
  • Open or short in flow shutting valve (for continuously variable transaxle fluid control) circuit
  • Flow shutting valve (for continuously variable transaxle fluid control)
  • ECM

Comes on

DTC stored
  • SAE Code: P26AD
  • DTC for Mexico Models: Applies

P26AC15

Engine Coolant Bypass Valve "B" Circuit Short to Battery or Open

All of the following conditions are met (1 trip detection logic).

  • A close signal is being sent from the ECM to the flow shutting valve (for continuously variable transaxle fluid control).
  • Current operating state and target operating state differ for 3 seconds or more continuously.
  • Open or short in flow shutting valve (for continuously variable transaxle fluid control) circuit
  • Flow shutting valve (for continuously variable transaxle fluid control)
  • ECM

Comes on

DTC stored
  • SAE Code: P26AE
  • DTC for Mexico Models: Applies

Related Data List

DTC No.

Data List

P26AC11

P26AC15

Coolant Temperature

Coolant Water Route Switching Valve 2

MONITOR DESCRIPTION

If the ignition switch is ON or the engine is running and the current operating state and target operating state of the flow shutting valve (for continuously variable transaxle fluid control) do not match, the ECM determines that there is an open or short in the flow shutting valve (for continuously variable transaxle fluid control) circuit and stores a DTC.

MONITOR STRATEGY

Related DTC

P26AD: Engine coolant bypass valve range check (low voltage)

P26AE: Engine coolant bypass valve range check (high voltage)

Required Sensors/Components (Main)

Engine coolant bypass valve (for continuously variable transaxle fluid control)

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

3 seconds

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

All

Monitor runs whenever the following DTCs are not stored

None

All of the following conditions are met

-

Either of the following conditions is met

1 or 2

1. Both of the following conditions are met

(a) and (b)

(a) Last commanded to engine coolant bypass valve

Off

(b) Current command to engine coolant bypass valve

Off

2. Both of the following conditions are met

(c) and (d)

(c) Last commanded to engine coolant bypass valve

On

(d) Current command to engine coolant bypass valve

On

Battery voltage

8 V or higher

Ignition switch

ON

Starter

Off

P26AD: Engine Coolant Bypass Valve Range Check (Low Voltage)

Command to engine coolant bypass valve

Off

P26AE: Engine Coolant Bypass Valve Range Check (High Voltage)

Command to engine coolant bypass valve

On

TYPICAL MALFUNCTION THRESHOLDS

P26AD: Engine Coolant Bypass Valve Range Check (Low Voltage)

Engine coolant bypass valve output terminal voltage level

Low

P26AE: Engine Coolant Bypass Valve Range Check (High Voltage)

Engine coolant bypass valve output terminal voltage level

High

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  • Make sure to perform this procedure when the engine coolant temperature is between 5 and 40°C (41 and 104°F) and the difference between the engine coolant temperature and intake air temperature is within 10°C (18°F) or less.
  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the ignition switch off and wait for at least 30 seconds.
  6. Turn the ignition switch to ON [A].
  7. Turn the Techstream on.
  8. Enter the following menus: Powertrain / Engine / Active Test / Activate the Coolant Water Route Switching Valve 2 [B].
  9. Perform the Active Test Activate the Coolant Water Route Switching Valve 2, select "Close" and wait for 3 seconds or more [C].
  10. Perform the Active Test Activate the Coolant Water Route Switching Valve 2, select "Open" and wait for 3 seconds or more [D].
  11. Enter the following menus: Powertrain / Engine / Trouble Codes [E].
  12. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  14. Input the DTC: P26AC11 or P26AC15.
  15. 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

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system is malfunctioning.
    • [A] to [E]: Normal judgment procedure.

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

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

Read Freeze Frame Data using the Techstream. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF FLOW SHUTTING VALVE (FOR CONTINUOUSLY VARIABLE TRANSAXLE FLUID CONTROL))

*a

Front view of wire harness connector

(to Flow Shutting Valve (for Continuously Variable Transaxle Fluid Control))

(a) Disconnect the flow shutting valve (for continuously variable transaxle fluid control) connector.

(b) Turn the ignition switch to ON.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

C52-2 - Body ground

Ignition switch ON

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 INTEGRATION RELAY - FLOW SHUTTING VALVE (FOR CONTINUOUSLY VARIABLE TRANSAXLE FLUID CONTROL))
OK

2.

INSPECT FLOW SHUTTING VALVE (FOR CONTINUOUSLY VARIABLE TRANSAXLE FLUID CONTROL)

(a) Inspect the flow shutting valve (for continuously variable transaxle fluid control).

Click here 2019 - 2023 MY Corolla Corolla Hatchback [06/2018 - 11/2022]; M20A-FKS (COOLING): FLOW SHUTTING VALVE (for CVT): INSPECTION

NG

REPLACE FLOW SHUTTING VALVE (FOR CONTINUOUSLY VARIABLE TRANSAXLE FLUID CONTROL) 2020 MY Corolla Corolla Hatchback [03/2019 - 09/2019]; M20A-FKS (COOLING): FLOW SHUTTING VALVE (for CVT): REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback [09/2019 - 09/2022]; M20A-FKS (COOLING): FLOW SHUTTING VALVE (for CVT): REMOVAL 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (COOLING): FLOW SHUTTING VALVE (for CVT): REMOVAL

OK

3.

CHECK HARNESS AND CONNECTOR (FLOW SHUTTING VALVE (FOR CONTINUOUSLY VARIABLE TRANSAXLE FLUID CONTROL) - ECM)

(a) Disconnect the flow shutting valve (for continuously variable transaxle fluid control) connector.

(b) Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C52-1 - C76-41 (WSV2)

Always

Below 1 Ω

C52-1 or C76-41(WSV2) - Body ground and other terminals

Always

10 kΩ or higher
OK

REPLACE ECM 2020 - 2022 MY Corolla Corolla Hatchback [03/2019 - 09/2022]; M20A-FKS (ENGINE CONTROL): ECM: REMOVAL 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (ENGINE CONTROL): ECM: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR