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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 109 (Hybrid Control System (AWD) - Diagnostic Codes (5 Of 6)) >> HYBRID CONTROL SYSTEM (for AWD) >> DTC P2600-31: Motor/Generator Coolant Pump "A" Control Circuit No Signal [12/2019 - 11/2023] >> Procedure

DTC P2600-31: Motor/Generator Coolant Pump "A" Control Circuit No Signal [12/2019 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. READ VALUE USING GTS (MOTOR/GENERATOR COOLING OIL PUMP MOTOR REVOLUTION) 
    1. Set the Duty ratio to 90%.

      HINT: 

      The active test is not performed when the Duty ratio is 50% or lower or 95% or higher, or the ambient temperature is 0°C (30°F) or lower.

      Powertrain > Hybrid Control > Active Test 

      Active Test Display
      Control the Motor/Generator Cooling Oil Pump
      Data List Display
      Motor/Generator Cooling Oil Pump Motor Revolution
    2. According to the display on the GTS, perform the Active Test "Control the Motor/Generator Cooling Oil Pump" and, check the value of the Data List item "Motor/Generator Cooling Oil Pump Motor Revolution".

      OK

      Tester Display Condition Specified Condition
      Motor/Generator Cooling Oil Pump Motor Revolution Ignition switch ON
      During Active Test      		 160 to 7600 rpm
    3. Turn the ignition switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  3

    Result: 

    OK 

    See step  2

  2. CHECK FOR INTERMITTENT PROBLEMS 

    Refer to CHECK FOR INTERMITTENT PROBLEMS [12/2019 - 11/2023]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

  3. CHECK CONNECTOR CONNECTION CONDITION (OIL PUMP WITH MOTOR ASSEMBLY CONNECTOR) 
    1. Check the connector connections and contact pressure of the relevant terminals for the C38 oil pump with motor assembly connector.

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [12/2019 - ]

      OK

      The connector is connected securely and there are no contact problems.

      GTY932936Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CONNECT SECURELY 

    Result: 

    OK 

    See step  4

  4. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) 

    Refer to PROCEDURE - Step 1

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    CONNECT SECURELY 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (OIL PUMP WITH MOTOR ASSEMBLY POWER SOURCE CIRCUIT) 
    1. Disconnect the C38 oil pump with motor assembly connector.
    2. Set the Duty ratio to 90%.

      HINT: 

      The active test is not performed when the Duty ratio is 50% or lower or 95% or higher, or the ambient temperature is 0°C (30°F) or lower.

      Powertrain > Hybrid Control > Active Test 

      Tester Display
      Control the Motor/Generator Cooling Oil Pump
    3. Measure the voltage according to the value(s) in the table below.
      GTY888855Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Oil Pump with Motor Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      C38-4 (L) - Body ground Ignition switch ON
      During Active Test      		 11 to 14 V
      NOTE:

      Turning the ignition switch to ON with the oil pump with motor assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    4. Turn the ignition switch off.
    5. Reconnect the C38 oil pump with motor assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (OIL PUMP WITH MOTOR ASSEMBLY - BODY GROUND) 
    1. Disconnect the C38 oil pump with motor assembly connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY888844Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Oil Pump with Motor Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      C38-1 (OPG) - Body ground Ignition switch off Below 1 Ω
    3. Reconnect the C38 oil pump with motor assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - OIL PUMP WITH MOTOR ASSEMBLY) 
    1. Disconnect the A31 hybrid vehicle control ECU connector.
    2. Disconnect the C38 oil pump with motor assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY907909Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)
      *b Front view of wire harness connector
      (to Oil Pump with Motor Assembly)

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      A31-22 (NOPM) - C38-2 (NOPM) Ignition switch off Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      A31-22 (NOPM) or C38-2 (NOPM) - Body ground and other terminals Ignition switch off 10 kΩ or higher
    4. Reconnect the C38 oil pump with motor assembly connector.
    5. Reconnect the A31 hybrid vehicle control ECU connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - OIL PUMP WITH MOTOR ASSEMBLY) 
    1. Disconnect the A31 hybrid vehicle control ECU connector.
    2. Disconnect the C38 oil pump with motor assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY907906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)
      *b Front view of wire harness connector
      (to Oil Pump with Motor Assembly)

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      A31-21 (OPM1) - C38-3 (OPM1) Ignition switch off Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      A31-21 (OPM1) or C38-3 (OPM1) - Body ground and other terminals Ignition switch off 10 kΩ or higher
    4. Turn the ignition switch to ON.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A31-21 (OPM1) or C38-3 (OPM1) - Body ground Ignition switch ON Below 1 V
      NOTE:

      Turning the ignition switch to ON with the hybrid vehicle control ECU and oil pump with motor assembly connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    6. Turn the ignition switch off.
    7. Reconnect the C38 oil pump with motor assembly connector.
    8. Reconnect the A31 hybrid vehicle control ECU connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE OIL PUMP WITH MOTOR ASSEMBLY. Refer to  REMOVAL [12/2019 - 11/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK FUSE (OIL PMP) 
    1. Remove the OIL PMP fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      OIL PMP fuse Always Below 1 Ω
      GTY917512Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 OIL PMP Fuse
    3. Install the OIL PMP fuse.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FUSE (OIL PMP) 

    Result: 

    OK 

    See step  10

  10. INSPECT RELAY (OIL PMP) 
    1. Remove the OIL PMP relay from the No. 1 engine room relay block and No. 1 junction block assembly.
      GTY853032Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 OIL PMP Relay
    2. Measure the resistance according to the value(s) in the table below.
      GTY454454Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 OIL PMP Relay

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 - 5 Auxiliary battery voltage not applied between terminals 1 and 2 10 kΩ or higher
      Auxiliary battery voltage applied between terminals 1 and 2 Below 1 Ω
    3. Install the OIL PMP relay.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (OIL PUMP WITH MOTOR ASSEMBLY POWER SOURCE CIRCUIT) 

    Result: 

    NG 

    REPLACE RELAY (OIL PMP) 

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