Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001FHI7
Model Year Start: 2019 Model: RAV4 HV Prod Date Range: [11/2018 - 08/2020]
Title: A25A-FXS (ENGINE CONTROL): SFI SYSTEM (w/o Canister Pump Module): P26CA31; Engine Coolant Pump No Signal; 2019 - 2020 MY RAV4 HV [11/2018 - 08/2020]

DTC

P26CA31

Engine Coolant Pump No Signal

DESCRIPTION

Refer to DTC P26CA12.

Click here 2019 - 2020 MY RAV4 HV [11/2018 - 08/2020]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM (w/o Canister Pump Module): P26CA12; Engine Coolant Pump Circuit Short to Battery+

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P26CA31

Engine Coolant Pump No Signal

The speed of the engine water pump calculated from the WPI signal is less than 10 rpm (open or short in the WPI circuit) (1 trip detection logic).
  • Open or short in engine water pump assembly (water inlet housing) circuit
  • Engine water pump assembly (water inlet housing)
  • EFI-MAIN NO. 3 relay
  • ECM

Comes on

DTC stored

SAE Code: P26CA

Related Data List

DTC No.

Data List

P26CA31
  • Coolant Temperature
  • Electric Water Pump Target Speed
  • Electric Water Pump Speed

MONITOR DESCRIPTION

The ECM receives a frequency signal (WPI) from the engine water pump assembly and calculates the speed of the engine water pump assembly. As the frequency signal (WPI) is 4 Hz when the engine water pump assembly is stopped to enable the ECM to detect an open or short in the signal line, the engine water pump assembly speed will be displayed as approximately 160 rpm even when the pump is stopped. If the engine water pump assembly speed is calculated to be less than 10 rpm, the ECM judges that there is an open or short in the WPI circuit and stores this DTC.

MONITOR STRATEGY

Required Sensors/Components

Engine water pump assembly

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the power switch off and wait for at least 30 seconds.
  6. Turn the power switch on (IG) [A].
  7. Turn the Techstream on.
  8. Put the engine in Inspection Mode (Maintenance Mode).

    Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INSPECTION MODE PROCEDURE

  9. Start the engine and maintain the engine speed at 2500 rpm or more for at least 40 seconds [B].
  10. Enter the following menus: Powertrain / Engine / Trouble Codes [C].
  11. 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.
  12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  13. Input the DTC: P26CA31.
  14. 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 has a malfunction.
    • If the judgment result is INCOMPLETE, perform steps [B] through [C] again.

WIRING DIAGRAM

Refer to DTC P26CA12.

Click here 2019 - 2020 MY RAV4 HV [11/2018 - 08/2020]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM (w/o Canister Pump Module): P26CA12; Engine Coolant Pump Circuit Short to Battery+

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.

    Click here 2019 - 2020 MY RAV4 HV [11/2018 - 08/2020]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for 2WD with NICKEL METAL HYDRIDE BATTERY): VEHICLE CONTROL HISTORY

    (Select Powertrain in Health Check and then check the time stamp data.)

    Click here 2019 - 2020 MY RAV4 HV [11/2018 - 08/2020]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM (w/o Canister Pump Module): DTC CHECK / CLEAR

  • If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.

    Click here 2019 - 2020 MY RAV4 HV [11/2018 - 08/2020]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for 2WD with NICKEL METAL HYDRIDE BATTERY): VEHICLE CONTROL HISTORY

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 ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING))

*a

Front view of wire harness connector

(to Engine Water Pump Assembly (Water Inlet Housing))

(a) Disconnect the engine water pump assembly (water inlet housing) connector.

(b) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

C23-5 (NWP) - Body ground

Power switch on (IG)

11 to 14 V
NG

GO TO STEP 8

OK

2.

CHECK HARNESS AND CONNECTOR (ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING) - BODY GROUND)

(a) Disconnect the engine water pump assembly (water inlet housing) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C23-3 (PGN2) - Body ground

Always

Below 1 Ω

C23-6 (PGND) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING))

*a

Front view of wire harness connector

(to Engine Water Pump Assembly (Water Inlet Housing))

(a) Disconnect the engine water pump assembly (water inlet housing) connector.

(b) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

C23-1 (+B2) - Body ground

Power switch on (IG)

11 to 14 V

C23-4 (+B) - Body ground

Power switch on (IG)

11 to 14 V
OK

REPLACE ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING) 2019 MY RAV4 HV [11/2018 - 02/2019]; A25A-FXS (COOLING): WATER PUMP: REMOVAL 2019 MY RAV4 HV [02/2019 - 10/2019]; A25A-FXS (COOLING): WATER PUMP: REMOVAL 2020 MY RAV4 HV [10/2019 - 08/2020]; A25A-FXS (COOLING): WATER PUMP: REMOVAL

NG

4.

INSPECT EFI-MAIN NO. 3 RELAY

(a) Inspect the EFI-MAIN NO. 3 relay.

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NG

REPLACE EFI-MAIN NO. 3 RELAY
OK

5.

CHECK HARNESS AND CONNECTOR (POWER SOURCE OF EFI-MAIN NO. 3 RELAY)

*1

No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly

*2

EFI-MAIN NO. 3 Relay

(a) Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

3 (EFI-MAIN NO. 3 relay) - Body ground

Always

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - EFI-MAIN NO. 3 RELAY)
OK

6.

CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - BODY GROUND)

(a) Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (EFI-MAIN NO. 3 relay) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING))

(a) Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Disconnect the engine water pump assembly (water inlet housing) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

5 (EFI-MAIN NO. 3 relay) - C23-1 (+B2)

Always

Below 1 Ω

5 (EFI-MAIN NO. 3 relay) - C23-4 (+B)

Always

Below 1 Ω

5 (EFI-MAIN NO. 2 relay), C23-1 (+B2) or C23-4 (+B) - Body ground and other terminals

Always

10 kΩ or higher
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 3 RELAY)
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.

CHECK HARNESS AND CONNECTOR (ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING) - ECM)

(a) Disconnect the engine water pump assembly (water inlet housing) 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

C23-5 (NWP) - C45-51 (WPI)

Always

Below 1 Ω

C23-5 (NWP) or C45-51 (WPI) - Body ground and other terminals

Always

10 kΩ or higher
OK

REPLACE ECM 2019 MY RAV4 HV [11/2018 - 02/2019]; A25A-FXS (ENGINE CONTROL): ECM: REMOVAL 2019 - 2020 MY RAV4 HV [02/2019 - 08/2020]; A25A-FXS (ENGINE CONTROL): ECM: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR