HYBRID CONTROL SYSTEM, Diagnostic DTC:P2601-778

DTC Code DTC Name
P2601-778 Oil Pump Control Range / Performance

DESCRIPTION

Refer to the description for DTC P2601-777.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
P2601-778 Oil Pump Control Range / Performance

Oil pump fails to start more than set number of times when oil pump start request is accepted and the temperature of the drive motor exceeds load limit temperature.

(1 trip detection logic)

  • Ambient temperature sensor

  • Oil piping

  • Oil pump with motor assembly

Master Warning Light:

Comes on
Related Data List
DTC No. Data List
P2601-778

  • Motor Cooler Oil Pump Status

  • Target Motor Cooler Oil Pump Duty

  • Motor Cooler Oil Pump Relay

CAUTION / NOTICE / HINT

Note

When the vehicle is parked with the power switch off, if the FC control ECU judges that the FC stack temperature will go below 0°C (32°F), it activates the FC air compressor, hydrogen pump and FC cooling water pump for a maximum of 180 seconds and drains water from the FC stack assembly. When performing inspection or repairs with the power switch off (not on (IG) or on (READY)), disconnect the cable from the negative (-) auxiliary battery terminal before performing work (If the auxiliary battery voltage is needed to conduct inspection, warm up the FC system beforehand).

Tech Tips


  • When troubleshooting the oil pump with motor assembly, check for the following conditions.


    • ATF temperature inside the oil cooler is 5°C (41°F) or more.

    • The ambient temperature sensor value is 5°C (41°F) or more.

  • After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


    1. Turn the power switch on (IG).

    2. Enter inspection mode.

      Tech Tips

      Entering inspection mode activates the oil pump with motor assembly.

    3. Turn the power switch on (READY) and wait for 5 seconds or more.

PROCEDURE


  1. CHECK THERMISTOR ASSEMBLY (AMBIENT TEMPERATURE SENSOR)

    Tech Tips

    The ambient temperature sensor value is used to detect DTC P2601-778. Check that the ambient temperature sensor operates normally, because P2601-778 may be mistakenly detected due to a malfunction in the ambient temperature sensor.


    1. Following the troubleshooting procedures for the ambient temperature sensor, check that the ambient temperature sensor operates normally.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE THERMISTOR ASSEMBLY (AMBIENT TEMPERATURE SENSOR) Click here

    OK

  2. CHECK OIL PIPE


    1. Check if the oil piping are kinked or clogged.

      Result
      Proceed to
      OK
      NG

    NG

    COLLECT THE PROBLEM

    OK

  3. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / EV / Trouble Codes.


      Powertrain > EV > Trouble Codes

    4. Read and record the DTCs and freeze frame data.

    5. Clear the DTCs.


      Powertrain > EV > Clear DTCs

    6. Turn the power switch off and wait for 3 minutes or more.

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK OIL PUMP WITH MOTOR ASSEMBLY


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter inspection mode.

      Tech Tips

      Entering inspection mode activates the oil pump with motor assembly.

    4. Turn the power switch on (IG).

    5. Enter the following menus: Powertrain / EV / Trouble Codes.

    6. Check for DTCs.


      Powertrain > EV > Trouble Codes
      Result
      Result Proceed to
      P2601-778 is not output. A
      P2601-778 is output. B

      Tech Tips


      • If the vehicle is driven at high loads when it is cold, the temperature of the drive motor might increase until it reaches the operating temperature of the oil pump with motor assembly. This temperature increase of the drive motor could happen before the temperature of the ATF goes up.

        When this DTC is stored as a result of the above conditions, it is not necessary to replace the oil pump with motor assembly as it is not malfunctioning.

      • When ATF whose low temperature viscosity is higher than ATF-WS is used, DTC might be output.

    7. Turn the power switch off.


    A

    COMPLETED

    B

    REPLACE OIL PUMP WITH MOTOR ASSEMBLY Click here