Last Modified: 05-13-2024 |
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
-
Connect the Techstream to the DLC3.
-
Turn the ignition switch to ON.
-
Turn the Techstream on.
-
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
-
Turn the ignition switch off and wait for at least 30 seconds.
-
Turn the ignition switch to ON [A].
-
Turn the Techstream on.
-
Enter the following menus: Powertrain / Engine / Active Test / Activate the Coolant Water Route Switching Valve 2 [B].
-
Perform the Active Test Activate the Coolant Water Route Switching Valve 2, select "Close" and wait for 3 seconds or more [C].
-
Perform the Active Test Activate the Coolant Water Route Switching Valve 2, select "Open" and wait for 3 seconds or more [D].
-
Enter the following menus: Powertrain / Engine / Trouble Codes [E].
-
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.
-
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
-
Input the DTC: P26AC11 or P26AC15.
-
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
|
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
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
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|