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.

CHECK CONNECTION CONDITION OF HYBRID VEHICLE CONTROL ECU CONNECTOR (LOOSENESS AND POOR CONTACT)
1. Check the connections of all HV control ECU connectors.
  OK:
  
  Connectors are connected securely and there is no poor connection.
Fig 1: Checking Connection Condition Of Hybrid Vehicle Control ECU Connector (Looseness And Poor Contact)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: CONNECT SECURELY

OK: GO TO NEXT STEP

READ VALUE OF INTELLIGENT TESTER (Rr MOTOR TEMP)

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 / DATA LIST / Rr MOTOR TEMP.

Read the value of "Rr MOTOR TEMP" in the data list displayed on the intelligent tester.

Result

Rr MOTOR TEMP

A	A	B	C
Rr MOTOR TEMP (°C)	-50	205	-49 to 204

HINT:

If there is an open or +B short circuit, -50°C will be displayed.
If there is a GND short circuit, 205°C will be displayed.

B: Go to step 6

C: CHECK FOR INTERMITTENT PROBLEMS

A: GO TO NEXT STEP

INSPECT REAR MOTOR TEMPERATURE SENSOR

Disconnect the M17 rear motor temperature sensor connector.
Turn the ignition switch to the ON position.

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

Result

REAR MOTOR TEMPERATURE SENSOR

Tester Connection	Voltage	Proceed to
RMT (M17-1) - RMTG (M17-3)	Approximately 5 V	A
	9 to 14 V	B
	Approximately 0 V	C

Fig 2: Inspecting Rear Motor Temperature Sensor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The rear motor temperature sensor is not available as a single product. If it requires replacement, replace the rear traction motor w/ transaxle assembly.

B: Go to step 4

C: Go to step 5

A: REPLACE REAR TRACTION MOTOR W/TRANSAXLE ASSEMBLY

CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - REAR MOTOR TEMPERATURE SENSOR)

Disconnect the H30 connector from the HV control ECU.
Turn the ignition switch to the ON position.

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

Standard Voltage

HV CONTROL ECU - REAR MOTOR TEMPERATURE SENSOR

Tester Connection	Specified Condition
RMT (M17-1) - Body ground	Approximately 0 V

NOTE: Turning the ignition switch to the ON position with the HV control ECU connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing the inspection.

Fig 3: Checking Harness And Connector (HV Control ECU - Rear Motor Temperature Sensor)

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE HYBRID VEHICLE CONTROL ECU

READ VALUE OF INTELLIGENT TESTER (Rr MOTOR TEMP)
1. Using SST, create a short circuit between terminals RMT (H30-21) and RMTG (H30-20) of the vehicle side connector of the HV control ECU.
2. Turn the ignition switch to the ON position.
3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DATA LIST / Rr MOTOR TEMP.
4. Read the value of "Rr MOTOR TEMP" displayed on the intelligent tester.
  Standard:
  
  Displayed temperature is 205°C
  
  HINT:
  
  If the intelligent tester shows a temperature of -50°C, check the connection of the HV control ECU. If it is connected normally, replace the HV control ECU.
  
  Fig 4: Reading Value Of Intelligent Tester (Rr Motor Temp)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE HYBRID VEHICLE CONTROL ECU

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR
READ VALUE OF INTELLIGENT TESTER (Rr MOTOR TEMP)
1. Disconnect the M17 rear motor temperature sensor connector.
2. Turn the ignition switch to the ON position.
3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DATA LIST / Rr MOTOR TEMP.
4. Read the value of "Rr MOTOR TEMP" displayed on the intelligent tester.
  Standard:
  
  Displayed temperature is -50°C
  
  HINT:
  
  The rear motor temperature sensor is not available as a single product. If it requires replacement, replace the rear traction motor w/ transaxle assembly.
OK: REPLACE REAR TRACTION MOTOR W/TRANSAXLE ASSEMBLY

NG: GO TO NEXT STEP
READ VALUE OF INTELLIGENT TESTER (Rr MOTOR TEMP)
1. Disconnect the H30 connector from the HV control ECU.
2. Turn the ignition switch to the ON position.
3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DATA LIST / Rr MOTOR TEMP.
4. Read the value of "Rr MOTOR TEMP" displayed on the intelligent tester.
  Standard:
  
  Displayed temperature is -50°C
  
  NOTE: Turning the ignition switch to the ON position with the HV control ECU connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing the inspection.
  
  Fig 5: Reading Value Of Intelligent Tester (Rr Motor Temp)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE HYBRID VEHICLE CONTROL ECU

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR