HYBRID CONTROL SYSTEM, Diagnostic DTC:P2603-768

DTC Code DTC Name
P2603-768 Oil Pump Control Circuit High

DESCRIPTION

Refer to the description for DTC P2601-777.

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DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
P2603-768 Oil Pump Control Circuit High

  • Open or +B short in oil pump circuit

  • When OPM2 signal is on, OPST signal remains high

(1 trip detection logic)

  • OIL PMP fuse

  • OIL PUMP relay

  • Wire harness or connector

  • EV control ECU

  • Oil pump with motor assembly

Master Warning Light:

Comes on
Related Data List
DTC No. Data List
P2603-768

  • Motor Cooler Oil Pump Status

  • Target Motor Cooler Oil Pump Duty

  • Motor Cooler Oil Pump Relay

WIRING DIAGRAM

Refer to the wiring diagram for DTC P2601-777.

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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 FUSE (OIL PMP)


    1. Remove the OIL PMP fuse from the motor compartment relay block.

    2. A01MJ9AC04
      *1 Motor Compartment Relay Block
      *2 OIL PMP Fuse

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      OIL PMP fuse terminals Always Below 1 Ω

    3. Install the OIL PMP fuse.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FUSES (OIL PMP)

    OK

  2. INSPECT NO. 1 INTEGRATION RELAY (OIL PUMP)

    Click here

    Result
    Proceed to
    OK
    NG

    NG

    REPLACE NO. 1 INTEGRATION RELAY (OIL PUMP) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (EV CONTROL ECU - NO. 1 INTEGRATION RELAY)


    1. Disconnect the No. 1 integration relay connector.

    2. Disconnect the EV control ECU connector.

    3. A01MHDQC02
      *a

      Rear view of wire harness connector

      (to EV Control ECU)
      *b

      Front view of wire harness connector

      (to No.1 Integration Relay)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A28-2 (OPM2) - 1A-2 Power switch off Below 1 Ω
      A28-2 (OPM2) or 1A-2 - Body ground and other terminals Power switch off 10 kΩ or higher

    4. Reconnect the No. 1 integration relay connector.

    5. Reconnect the EV control ECU connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (OIL PUMP WITH MOTOR ASSEMBLY - NO. 1 INTEGRATION RELAY)


    1. Disconnect the No. 1 integration relay connector.

    2. Disconnect the oil pump with motor assembly connector.

    3. A01MFNMC02
      *a

      Front view of wire harness connector

      (to Oil Pump with Motor Assembly)
      *b

      Front view of wire harness connector

      (to No. 1 Integration Relay)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A8-4 (L) - 1A-4 Power switch off Below 1 Ω
      A8-4 (L) or 1A-4 - Body ground and other terminals Power switch off 10 kΩ or higher

    4. Reconnect the No. 1 integration relay connector.

    5. Reconnect the oil pump with motor assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. 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. A01MI35C13
      *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
      A8-2 (OPST) or A28-34 (OPST) - Body ground and other terminals Power switch on (IG) Below 1 V

      Note

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A8-2 (OPST) - A28-34 (OPST) Power switch off Below 1 Ω

    7. Reconnect the EV control ECU connector.

    8. Reconnect the oil pump with motor assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK EV CONTROL ECU


    1. Turn the power switch on (IG).

    2. Enter inspection mode.

      Click here

      Tech Tips

      Entering inspection mode activates the oil pump with motor assembly.

    3. Turn the power switch on (IG).

    4. A01MIOSC75
      *a

      Component with harness connected

      (EV Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A28-2 (OPM2) - G45-6 (E1)

      Inspection mode

      Power switch on (READY)

      		 11 to 14 V

    5. Turn the power switch off.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A28-34 (OPST) - A27-4 (+B1) Power switch off 9 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE OIL PUMP WITH MOTOR ASSEMBLY Click here

    NG

    REPLACE EV CONTROL ECU Click here