Inspection Procedure

READ OUTPUT DTC (HV)

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 / DTC INFO / CURRENT CODES.

Read output DTC. (See DTC CHECK / CLEAR )

Result: The DTCs shown in the table below are output

DTCS RESULT DESCRIPTION

DTC No.	Relevant Diagnosis
P0A3F-243, P0A40-500, P0A41-245	Motor resolver circuit

YES: GO TO DTC CHART

NO: Go to next step

CHECK HARNESS AND CONNECTOR (MG ECU - MOTOR RESOLVER)

CAUTION: Be sure to wear insulated gloves.

Turn the ignition switch off and remove the service plug grip. (See HYBRID CONTROL SYSTEM )
NOTE: Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.
Remove the inverter cover. (See INVERTER WITH CONVERTER )
NOTE:
- Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
- Prevent water in the reservoir tank from entering the inverter.
Disconnect the I22 connector from the MG ECU.

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

Standard Voltage

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
MRF (I22-13) - Body ground	Below 1 V
MRFG (I22-23) - Body ground	Below 1 V
MSN (I22-21) - Body ground	Below 1 V
MSNG (I22-20) - Body ground	Below 1 V
MCS (I22-19) - Body ground	Below 1 V
MCSG (I22-18) - Body ground	Below 1 V

Fig 1: Disconnecting I22 Connector From MG ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Turn the ignition switch off.

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

Standard Resistance (Check for open)

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
MRF (I22-13) - MRFG (I22-23)	7.65 to 10.2 Ω
MSN (I22-21) - MSNG (I22-20)	12.6 to 16.8 Ω
MCS (I22-19) - MCSG (I22-18)	12.6 to 16.8 Ω

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

Standard Resistance (Check for short)

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
MSF (I22-13) or MRFG (I22-23) - Body ground	10 kΩ or higher
MSN (I22-21) or MSNG (I22-20) - Body ground	10 kΩ or higher
MCS (I22-19) or MCSG (I22-18) - Body ground	10 kΩ or higher

OK: CHECK W/ CONVERTER INVERTER ASSEMBLY

NG: Go to next step

INSPECT MOTOR RESOLVER

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

Standard Resistance

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
MRF (M14-1) - MRFG (M14-4)	7.65 to 10.2 Ω
MSN (M14-2) - MSNG (M14-5)	12.6 to 16.8 Ω
MCS (M14-3) - MCSG (M14-6)	12.6 to 16.8 Ω

Using a megohmmeter, measure the insulation resistance according to the value (s) in the table below.

NOTE: Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

Fig 2: Identifying M14 Terminals Of Motor Resolver Connector

Standard Resistance

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
MRF (M14-1) - MSN (M14-2)	10 MΩ or higher
MRF (M14-1) - MCS (M14-3)	10 MΩ or higher
MSN (M14-2) - MCS (M14-3)	10 MΩ or higher
MRFG (M14-4) - MSNG (M14-5)	10 MΩ or higher
MRFG (M14-4) - MCSG (M14-6)	10 MΩ or higher
MSNG (M14-5) - MCSG (M14-6)	10 MΩ or higher
Each terminal listed above - Transaxle housing	10 MΩ or higher

HINT:

The motor resolver is not available as a single product. If it requires replacement, replace the HV transaxle assembly.

NG: REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR