SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P26CA31

DTC Code DTC Name
P26CA31 Engine Coolant Pump No Signal

DESCRIPTION

Refer to DTC P26CA12.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P26CA31 Engine Coolant Pump No Signal The speed of the engine coolant 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 GTS to the DLC3.

  2. Turn the engine switch on (IG).

  3. Turn the GTS on.

  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  5. Turn the engine switch off and wait for at least 30 seconds.

  6. Turn the engine switch on (IG) [A].

  7. Turn the GTS on.

  8. Move the shift lever to P [B].

  9. Start the engine and maintain the engine speed at 2500 rpm or more for at least 40 seconds [C].

  10. Enter the following menus: Powertrain / Engine / Trouble Codes [D].

  11. Read the pending DTCs.

    Tech Tips


    • 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.

    GTS 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

    Tech Tips


    • 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 [D] again.

WIRING DIAGRAM

Refer to DTC P26CA12.

Click here

CAUTION / NOTICE / HINT

Note

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

Tech Tips

Read Freeze Frame Data using the GTS. 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))

    B006ZUJC05
    *a

    Front view of wire harness connector

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

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

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C43-5 (NWP) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

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


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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C43-3 (PGN2) - Body ground Always Below 1 Ω
      C43-6 (PGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    B006ZUJC03
    *a

    Front view of wire harness connector

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

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

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C43-1 (+B2) - Body ground Engine switch on (IG) 11 to 14 V
      C43-4 (+B) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING) Click here

    NG

  4. INSPECT EFI-MAIN NO. 3 RELAY


    1. Inspect the EFI-MAIN NO. 3 relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE EFI-MAIN NO. 3 RELAY

    OK

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

    B006Z1TC01
    *1 Engine Room Relay Block and Junction Block Assembly
    *2 EFI-MAIN NO. 3 Relay

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

    2. 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
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

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


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

    2. 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
      Result
      Proceed to
      OK
      NG

    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))


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

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

    3. 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) - C43-1 (+B2) Always Below 1 Ω
      5 (EFI-MAIN NO. 3 relay) - C43-4 (+B) Always Below 1 Ω
      5 (EFI-MAIN NO. 2 relay), C43-1 (+B2) or C43-4 (+B) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    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)


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

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C43-5 (NWP) - C57-51 (WPI) Always Below 1 Ω
      C43-5 (NWP) or C57-51 (WPI) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR