HYBRID CONTROL SYSTEM, Diagnostic DTC:P2601-777

DTC Code DTC Name
P2601-777 Oil Pump Control Range / Performance

DESCRIPTION

The EV control ECU detects drive motor temperature based on signals from the drive motor temperature sensor and activates the OIL PMP relay and oil pump driver (oil pump with motor assembly).

The EV control ECU monitors OPST signals from the oil pump driver and detects malfunctions.

A01MHOUE02
DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
P2601-777 Oil Pump Control Range / Performance

Command signal (OPM1) from EV control ECU is abnormal

(1 trip detection logic)

  • Oil pump with motor assembly

  • EV control ECU

  • Wire harness or connector

Master Warning Light:

Comes on
Related Data List
DTC No. Data List
P2601-777

  • Motor Cooler Oil Pump Status

  • Target Motor Cooler Oil Pump Duty

  • Motor Cooler Oil Pump Relay

The oil pump assembly with motor activates when the temperature of the drive motor is 85°C (185°F) or more:

Tech Tips

The oil pump with motor assembly cannot be activated only with the OIL PMP relay on. It is activated after receiving the command signals (OPM1) from the EV control ECU.

WIRING DIAGRAM

A01MJN7E01

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 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. A01MGQDC04
      *a

      Component with harness connected

      (EV control ECU)
      *b Normal Waveform

      Connect an oscilloscope between the EV control ECU terminals specified in the table below, and measure the waveform.

      Item Content
      Terminal A28-33 (OPM1) - G45-6 (E1)
      Equipment Setting 10 V/DIV., 20 ms/DIV.
      Condition

      Inspection mode

      Power switch on (READY)
      Result
      Result Proceed to
      Normal waveform is output. A
      No waveform (0 V) B
      No waveform (12 V) C
      Other than above. D

    6. Turn the power switch off.


    A

    REPLACE OIL PUMP WITH MOTOR ASSEMBLY Click here

    C

    CHECK HARNESS AND CONNECTOR (EV CONTROL ECU - OIL PUMP WITH MOTOR ASSEMBLY) Click here

    D

    REPLACE EV CONTROL ECU Click here

    B

  2. CHECK HARNESS AND CONNECTOR (EV CONTROL ECU - OIL PUMP WITH MOTOR ASSEMBLY)


    1. Disconnect the oil pump with motor assembly connector.

    2. Disconnect the EV control ECU connector.

    3. A01MI35C10
      *a

      Front view of wire harness connector

      (to Oil Pump with Motor Assembly)
      *b

      Rear view of wire harness connector

      (to EV Control ECU)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A8-3 (OPM1) - A28-33 (OPM1) Power switch off Below 1 Ω
      A8-3 (OPM1) or A28-33 (OPM1) - Body ground and other terminals Power switch off 10 kΩ or higher

    4. Reconnect the EV control ECU connector.

    5. Reconnect the oil pump with motor assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK OIL PUMP WITH MOTOR ASSEMBLY


    1. Disconnect the EV Control ECU connector.

    2. A01MGWWC03
      *a

      Rear view of wire harness connector

      (to EV Control ECU)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A28-33 (OPM1) - G45-6 (E1) Power switch off 10 kΩ or higher

    3. Reconnect the EV Control ECU connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE EV CONTROL ECU Click here

    NG

    REPLACE OIL PUMP WITH MOTOR ASSEMBLY Click here

  4. CHECK HARNESS AND CONNECTOR (EV CONTROL ECU - OIL PUMP WITH MOTOR ASSEMBLY)


    1. Disconnect the Oil Pump with Motor Assembly connector.

    2. Disconnect the EV control ECU connector.

    3. Turn the power switch on (IG).

    4. A01MI35C11
      *a

      Front view of wire harness connector

      (to Oil Pump with Motor Assembly)
      *b

      Rear view of wire harness connector

      (to EV Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A8-3 (OPM1) or A28-33 (OPM1) - Body ground Power switch on (IG) Below 1 V

      Tech Tips

      Turning the power switch on (IG) with the EV control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    5. Turn the power switch off.

    6. Reconnect the EV control ECU connector.

    7. Reconnect the oil pump with motor assembly.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT OIL PUMP WITH MOTOR ASSEMBLY


    1. Disconnect the A8 oil pump with motor assembly connector.

    2. A01MFRDC10
      *a

      Component without harness connected

      (Oil Pump with Motor Assembly)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      3 (OPM1) - 4 (L) Power switch off 10 kΩ or higher

    3. Reconnect the oil pump with motor assembly.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE EV CONTROL ECU Click here

    NG

    REPLACE OIL PUMP WITH MOTOR ASSEMBLY Click here