Inspection Procedure

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: Go to next step 

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: Go to next step 

1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to the ON position.
3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / ACTIVE TEST / INSPECTION MODE 1.
4. Move to INSPECTION MODE1 and put the vehicle into READY-on state to enter oil pump forced activation mode.
5. 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