Inspection Procedure

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

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

CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - OIL PUMP W/ MOTOR ASSEMBLY)

Disconnect the H34 HV control ECU connector.
Disconnect the oil pump w/ motor assembly connector.

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

Standard Resistance

HV CONTROL ECU - OIL PUMP W/ MOTOR ASSEMBLY

Tester Connection	Specified Condition
OPST (H34-7) - Body ground	10 kΩ or higher

Fig 1: Checking Harness And Connector (HV Control ECU - Oil Pump W/Motor Assembly)

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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP

INSPECT OIL PUMP W/ MOTOR ASSEMBLY

Disconnect the O9 oil pump w/ motor assembly connector.

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

Standard Resistance

OIL PUMP W/ MOTOR ASSEMBLY

Tester Connection	Specified Condition
STAT (O9-2) - Body ground	10 kΩ or higher

Fig 2: Inspecting Oil Pump W/Motor Assembly

NG: REPLACE OIL PUMP W/ MOTOR ASSEMBLY

OK: REPLACE HYBRID VEHICLE CONTROL ECU