DTC P26A3: Engine Coolant Bypass Valve "A" Range/Performance: Notes

WARNING: This page is about a different variant/trim than selected.

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DTC detecting condition:

Detected when two consecutive driving cycles with fault occur.

Trouble symptom:
- Coolant temperature rises slowly
- Poor acceleration
Wiring diagram:

Engine Electrical System Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>ENGINE ELECTRICAL SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Use the check board when measuring the ECM terminal voltage and resistance. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.5)>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD .

NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.5)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

CHECK THERMO-CONTROL VALVE ASSEMBLY MOTOR .
1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Measure the resistance between ECM connectors.
Connector and terminal

(E158) No. 82 - (E158) No. 91:

Is the resistance 1 MΩ or more?

Yes: Go to 2.

No: Go to 3.
CHECK HARNESS BETWEEN ECM AND THERMO-CONTROL VALVE ASSEMBLY CONNECTOR (OPEN) .
1. Disconnect the connector from the thermo-control valve assembly.
2. Measure the resistance between ECM connector and thermo-control valve assembly connector.
Connector and terminal

(E158) No. 82 - (E164) No. 5:

(E158) No. 91 - (E164) No. 4:

Is the resistance 1 MΩ or more?

Yes: Repair the open circuit of the harness between the ECM connector and thermocontrol valve assembly connector.

No: Replace the thermo-control valve assembly. Ref. to COOLING (H4DO (EXCEPT FOR HEV))>THERMO CONTROL VALVE ASSEMBLY .
CHECK THERMO-CONTROL VALVE ASSEMBLY OPENING ANGLE SENSOR .
1. Using the Subaru Select Monitor, select [Coolant Circulation Valve Control] of [Active Test].
  NOTE: For detailed operation procedures, refer to the "Active Test". Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.5)>ACTIVE TEST .
2. Adjust the target value of [Coolant Circulation Valve Control] to set the value of [Coolant Circulation Valve Target Angle] to 79 deg.
3. Read the value of [Coolant Circulation Valve Actual Angle].
Is the value of [Coolant Circulation Valve Actual Angle] between 73.7 deg - 84.3 deg within seven seconds after setting [Coolant Circulation Valve Target Angle]?

Yes: Go to 4.

No: Replace the thermo-control valve assembly. Ref. to COOLING (H4DO (EXCEPT FOR HEV))>THERMO CONTROL VALVE ASSEMBLY .
CHECK THERMO-CONTROL VALVE ASSEMBLY OPENING ANGLE SENSOR .
1. Adjust the target value of [Coolant Circulation Valve Control] to set the value of [Coolant Circulation Valve Target Angle] to -83 deg.
2. Read the value of [Coolant Circulation Valve Actual Angle].
Is the value of [Coolant Circulation Valve Actual Angle] between -77.7 deg - -88.3 deg within seven seconds after setting [Coolant Circulation Valve Target Angle]?

Yes: Even if DTC is detected, the thermo-control valve assembly has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

No: Replace the thermo-control valve assembly. Ref. to COOLING (H4DO (EXCEPT FOR HEV))>THERMO CONTROL VALVE ASSEMBLY .