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 OPERATION OIL PUMP W/MOTOR ASSEMBLY

Connect the intelligent tester to the DLC3.
Turn the ignition switch to the ON position.
Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / ACTIVE TEST / INSPECTION MODE

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

OPERATION OIL PUMP W/MOTOR ASSEMBLY

Tester Connection	Specified Condition
OPM1 (H34-6)- E1 (H31-5)	The waveform appears as shown in Fig 1.

Result

OPERATION OIL PUMP W/MOTOR ASSEMBLY WAVFORM RESULT

Waveform	Proceed to
Normal waveform	A
Waveform other than normal waveform	B
No waveform (0 V)	C
No waveform (12 V)	D

Fig 1: Checking Operation Oil Pump W/Motor Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

B: REPLACE HV CONTROL ECU

C: Go to step 2

D: Go to step 4

A: REPLACE OIL PUMP W/MOTOR ASSEMBLY

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

Disconnect O9 oil pump w/ motor assembly connector.
Disconnect the H34 connector from the HV control ECU.

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

Standard Resistance (Check for open)

HV CONTROL ECU - OIL PUMP W/MOTOR ASSEMBLY (CHECK FOR OPEN)

Tester Connection	Specified Condition
OPM1 (H34-6) - SIG (O9-3)	Below 1 Ω

Standard Resistance (Check for short)

HV CONTROL ECU - OIL PUMP W/MOTOR ASSEMBLY (CHECK FOR SHORT)

Tester Connection	Specified Condition
OPM1 (H34-6) or SIG (O9-3) - Body ground	10 kΩ or higher

Fig 2: Checking Harness And Connector (HV Control ECU - Oil Pump W/Motor Assembly)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Reconnect the HV control ECU connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP

INSPECT HV CONTROL ECU (OPM1 TERMINAL CONTINUITY CHECK)

Disconnect the H31 and H34 HV control ECU connectors.

Check the continuity between each terminal.

Standard Resistance

HV CONTROL ECU (OPM1 TERMINAL CONTINUITY CHECK)

Tester Connection	Specified Condition
OPM1 (H34-6) - E1 (H31-5)	10 kΩ or higher

Fig 3: Inspecting HV Control ECU (OPM1 Terminal Continuity Check)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE HV CONTROL ECU

OK: REPLACE OIL PUMP W/MOTOR ASSEMBLY

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

Disconnect the O9 oil pump w/ motor assembly connector.
Disconnect the H34 HV control ECU connector.

Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.

Standard Voltage

HV CONTROL ECU - OIL PUMP W/MOTOR ASSEMBLY

Tester Connection	Specified Condition
OPM1 (H34-6) - Body ground	Below 1 V

Fig 4: Checking Harness And Connector (HV Control ECU - Oil Pump W/Motor Assembly)

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP

INSPECT OIL PUMP W/MOTOR ASSEMBLY

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

Standard

OIL PUMP W/MOTOR ASSEMBLY

Tester Connection	Specified Condition
+B (O9-4) - SIG (O9-3)	10 kΩ or higher

Fig 5: Inspecting Oil Pump W/Motor Assembly

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE HV CONTROL ECU