DTC    P2603-768    Coolant Pump Control Circuit High

for Preparation Click here


DESCRIPTION

Refer to the description for DTC P2601-777. (Click here)

DTC No.
INF No.
DTC Detection Condition
Trouble Area
P2603
768
  1. Open or +B short in oil pump driver circuit
  2. When OPM2 signal is ON, OPST signal remains Hi
  1. Wire harness or connector
  2. Oil pump w/ motor assembly
  3. HV control ECU

WIRING DIAGRAM

Refer to the wiring diagram for DTC P2601-777. (Click here)

INSPECTION PROCEDURE

NOTICE:
  1. When troubleshooting the oil pump w/ motor assembly, check for the following conditions.
    1. ATF temperature inside the oil cooler is 5°C (41 °F) or more.
    2. Value of the ambient temperature sensor is 5°C (41 °F) or more.

1.INSPECT OIL PUMP FUSE


    A105193E03

  1. Remove the oil pump fuse from the engine room R/B No.4.

  1. Check continuity of the oil pump fuse.

    OK:
    There is continuity.



NG
REPLACE OIL PUMP FUSE
OK


2.INSPECT OIL PUMP RELAY


    B016200

  1. Remove the oil pump relay from the engine room R/B No.4.

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

    Standard Resistance:
    Tester Connection
    		Specified Condition
    1 - 2
    		Below 1 Ω
    3 - 5
    		10 kΩ or higher
    Below 1 Ω
    (Apply battery voltage between terminals 1 and 2)



NG
REPLACE OIL PUMP RELAY
OK


3.CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - OIL PUMP RELAY, OIL PUMP RELAY - OIL PUMP)


    A111633E05

  1. Remove the oil pump relay from the engine room R/B No.4.

  1. Disconnect the O3 oil pump w/ motor assembly connector.

  1. Disconnect the H31 HV control ECU connector.

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

    Standard Resistance (Check for open):
    Tester Connection
    		Specified Condition
    OPM2 (H31-5) - Engine room R/B No.4 OIL PUMP relay terminal 1
    		Below 1 Ω

    Standard Resistance (Check for short):
    Tester Connection
    		Specified Condition
    OPM2 (H31-5) or Engine room R/B No.4 OIL PUMP relay terminal 1 - Body ground
    		10 kΩ or higher

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

    Standard Resistance (Check for open):
    Tester Connection
    		Specified Condition
    Engine room R/B No.4 OIL PUMP relay terminal 2 - +B (O3-1)
    		Below 1 Ω

    Standard Resistance (Check for short):
    Tester Connection
    		Specified Condition
    Engine room R/B No.4 OIL PUMP relay terminal 2 or +B (O3-1) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - OIL PUMP)


    A111631E18

  1. Disconnect the O3 oil pump w/ motor assembly connector.

  1. Disconnect the H31 HV control ECU connector.

  1. Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.

    Standard Voltage:
    Tester Connection
    		Specified Value
    OPST (H31-7) or STAT (O3-2) - Body ground
    		Below 1 V

  1. Turn the ignition switch off.

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

    Standard Resistance:
    Tester Connection
    		Specified Condition
    OPST (H31-7) - STAT (O3-2)
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.INSPECT HYBRID VEHICLE CONTROL ECU


    A111634E04

  1. Remove the oil pump relay from the engine room R/B No.4.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to the ON position.

  1. Select the following menu items: Powertrain / Hybrid Control /Active Test / Inspection Mode.

  1. Put the vehicle into the READY-on state.

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

    Standard Voltage:
    Tester Connection
    		Specified Value
    OPM2 (H31-5) - E1 (H32-5)
    		10 to 14 V

  1. Turn the ignition switch off.

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

    Standard Resistance:
    Tester Connection
    		Specified Condition
    OPST (H31-7) - +B1 (H31-2)
    		10 kΩ or higher



NG
REPLACE HYBRID VEHICLE CONTROL ECU
OK

REPLACE OIL PUMP W/MOTOR ASSEMBLY