RX400h · Service Manual HYBRID SYSTEM

P2601-779

Diagnostic trouble codes

DESCRIPTION

Refer to the description for DTC P2601-777. (Click here)
DTC No.
 INF No.
 DTC Detection Condition
 Trouble Area
P2601
 779
  1. Abnormal power source voltage is detected by oil pump driver
  2. Power source voltage input to oil pump driver is 6.96 V or less for 2 seconds or more with oil pump relay on
  1. Wire harness or connector
  2. Oil pump w/ motor assembly
  3. OIL PUMP fuse
  4. 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. READ OUTPUT DTC (HV)

  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 / DTC.

  1. Read output DTCs. (Click here)

    Result:
    DTC P0A08-264 is output.



YES
GO TO DTC CHART
NO


2. RECONFIRM OUTPUT DTC (HV)

  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 / DTC / Clear.

  1. Turn the ignition switch to the ON position, and select the following menu items: Powertrain / Hybrid Control / DTC.

  1. Read output DTCs. (Click here)

    Result:
    DTC P0A08-264 is output again.



NO
CHECK FOR INTERMITTENT PROBLEMS
YES


3. CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - OIP PUMP - BODY GROUND)

  1. A111632E04
    Disconnect the cable from the positive auxiliary battery terminal.

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

    Standard Resistance:
    Tester Connection
    		 Specified Value
    Positive auxiliary battery terminal - Engine room R/B No.4 OIL PUMP relay terminal 5
    		 Below 2 Ω
    		 R1
    Engine room R/B No.4 OIL PUMP relay terminal 5 - +B (O3-4)
    		 Below 2 Ω
    		 R2
    GND (O3-1) - Body ground
    		 Below 2 Ω
    		 R3

    Standard Resistance:
    Combined resistance (R1, R2 and R3) of each part in the wire harness is below 6 Ω.



 NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4. INSPECT HYBRID VEHICLE CONTROL ECU

  1. A115325E02
    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. Check the waveform between the terminals of the HV control ECU.

    OK:
    Tester Connection
    		 Specified Condition
    OPST (H31-7) - E1 (H32-5)
    		 The waveform appears as shown in the illustration.



NG
REPLACE HYBRID VEHICLE CONTROL ECU
OK

REPLACE OIL PUMP W/MOTOR ASSEMBLY


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