Inspection Procedure

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 / DTC INFO / CURRENT CODES.
4. Read output DTC. (See DTC CHECK / CLEAR )

   Result: 

   The DTCs shown in the table below are output 

   DTC DETECTION TROUBLE CONDITION
   
   

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

YES: GO TO  DIAGNOSTIC TROUBLE CODE CHART 

NO: GO TO NEXT STEP 

1. Turn the ignition switch off and remove the service plug grip. (See PRECAUTION )
   NOTE: Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.
2. 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.
3. Disconnect the I22 connector from the MG ECU.
4. Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.

   Standard Voltage 

   MG ECU - MOTOR RESOLVER (VOLTAGE)
   
   

   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: Checking Harness And Connector (MG ECU - Motor Resolver)

   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.
5. Turn the ignition switch off.
6. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for open) 

   MG ECU - MOTOR RESOLVER (CHECK FOR OPEN)
   
   

   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

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

   Standard Resistance (Check for short) 

   MG ECU - MOTOR RESOLVER (CHECK FOR SHORT)
   
   

   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 

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

   Standard Resistance 

   MOTOR RESOLVER
   
   

   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

   Fig 2: Inspecting Motor Resolver

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Using a megohmmeter, measure the insulation resistance according to the value(s) in the table below.

   Standard Resistance 

   MOTOR RESOLVER (USING MEGOHMMETER)
   
   

   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