RX400h · Service Manual HYBRID SYSTEM

P2601-778

Diagnostic trouble codes

DESCRIPTION

Refer to the description for DTC P2601-777. (Click here)
DTC No.
 INF No.
 DTC Detection Condition
 Trouble Area
P2601
 778
  1. Ambient temperature is 5°C (41°F) or more
  2. Duty output from oil pump driver is between 65 and 75 %
  3. Oil pump w/ motor assembly does not start
  1. Ambient temperature sensor
  2. Fluid piping
  3. Oil pump w/ motor assembly

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 AMBIENT TEMPERATURE SENSOR

HINT:
Values of the ambient temperature sensor are used as judgement values in order to detect DTC P2601-778. Check that the ambient temperature sensor operates normally, because P2601-778 may be mistakenly detected due to a malfunction in the ambient temperature sensor.

  1. Following the troubleshooting procedures for the ambient temperature sensor, check that the ambient temperature sensor operates normally.



 NG
GO TO AMBIENT TEMPERATURE SENSOR INSPECTION
OK


2. INSPECT FLUID PIPING

  1. Check that there is no blockage or clog in the pipes among the oil pump w/ motor assembly, oil cooler, and HV transaxle.



 NG
REPAIR OR REPLACE FLUID PIPING
OK


3. CHECK OPERATION OF OIL PUMP W/MOTOR ASSEMBLY

  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. Move to INSPECTION MODE and put the vehicle into READY-on state to enter oil pump forced activation mode.

  1. Read the DTCs of the HV system.

    Result:
    P2061-778 is output.

HINT:
If overload driving is performed in cold climates, coil temperature may reach the starting condition temperature before ATF temperature reaches ready-to-start temperature. If any DTC is output under the above condition, it is unnecessary to replace the parts because it is not due to the oil pump malfunction but DTC out of operation coverage for the oil pump w/ motor assembly. If ATF whose low temperature viscosity is higher than ATF-WS is in the HV transaxle, DTC P2601-778 may be output.



 YES
REPLACE OIL PUMP W/MOTOR ASSEMBLY
NO

SYSTEM OK


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