RX400h · Service Manual HYBRID SYSTEM

P2601-780

Diagnostic trouble codes

DESCRIPTION

Refer to the description for DTC P2601-777. (Click here)
DTC No.
 INF No.
 DTC Detection Condition
 Trouble Area
P2601
 780
 OPST signal is input even though OPM2 signal is off
  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 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


2. REPAIR OR REPLACE HARNESS AND CONNECTOR (HV CONTROL ECU - OIL PUMP RELAY)
A114405E03

  1. Remove the OIL PUMP relay from the engine room R/B No.4.

  1. Disconnect the H31 HV control ECU connector.

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

    Standard Voltage:
    Tester Connection
    		 Specified Value
    OPM2 (H31-5)-Engine room R/B No.4 OIL PUMP relay terminal 2
    		 Below 1 V

  1. Turn the ignition switch off.

  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 2
    		 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 2 - Body ground
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3. INSPECT HYBRID VEHICLE CONTROL ECU

  1. A103658E44
    Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		 Specified Condition
    OPM2 (H31-5) - +B1 (H31-2) and +B1 (H31-1)
    		 10 kΩ or higher



NG
REPLACE HYBRID VEHICLE CONTROL ECU
OK


4. REPRODUCTION TEST

  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 and turn on the oil pump relay (activate the oil pump w/ motor assembly).

  1. Exit Inspection Mode and turn the ignition switch off.

  1. Repeat the above four steps to turn the oil pump relay on and off.

    Result:
    The symptom is reproduced. (DTC P2601-780 is output.)



 NG
CHECK FOR INTERMITTENT PROBLEM
OK

REPLACE OIL PUMP W/MOTOR ASSEMBLY


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