DTC    P0A4B-253    Generator Position Sensor Circuit

DTC    P0A4C-513    Generator Position Sensor Circuit Range / Performance

DTC    P0A4D-255    Generator Position Sensor Circuit Low

for Preparation Click here


DESCRIPTION

A resolver is a sensor that detects the position of the magnetic poles, which are indispensable for ensuring highly efficient control of the Motor and Generator.
The resolver structure and method of connection with the MG ECU are the same as those of the motor resolver.
The MG ECU monitors output signals from the resolver and detects a malfunction.

DTC No.
INF Code
DTC Detection Condition
Trouble Area
P0A4B
253
Interphase short in generator resolver circuit
  1. Wire harness or connector
  2. HV transaxle assembly (Generator resolver)
  3. w/ converter inverter assembly (MG ECU)
P0A4C
513
Generator resolver output is out of normal range
  1. Wire harness or connector
  2. HV transaxle assembly (Generator resolver)
  3. w/ converter inverter assembly (MG ECU)
P0A4D
255
Open or short in generator resolver circuit
  1. Wire harness or connector
  2. HV transaxle assembly (Generator resolver)
  3. w/ converter inverter assembly (MG ECU)

MONITOR DESCRIPTION

The MG ECU monitors the generator resolver output signal. If the MG ECU detects output signals that are out of the normal range or specification, it will conclude that there is a malfunction of the generator resolver. The HV control ECU will illuminate the MIL and set a DTC.

WIRING DIAGRAM


A113951E04


INSPECTION PROCEDURE

CAUTION:
  1. Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from reconnecting it while you are working on the high-voltage system.
  2. After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.

NOTICE:
Check the output DTCs again after the repair has been completed. If P0A78-286, P0A7A-324, or P0A79-696 is output, replace the w/ converter inverter assembly.

HINT:
  1. If the problem symptom cannot be reproduced, performing the driving test on a road on which the vehicle tends to vibrate will make it easier to reproduce the symptom.
  2. If INF code 253 is output, an interphase short in the resolver circuit may have occurred due to water in the resolver. Thus, if the malfunction is not reproduced, it must be the HV transaxle assembly to replace at the last step.
  3. At least 5 minutes is required to discharge the high-voltage capacitor inside the w/ converter inverter assembly.

1.CHECK CONNECTION CONDITION OF MG ECU CONNECTOR (LOOSENESS AND POOR CONTACT)

CAUTION:
Be sure to wear insulated gloves.



    A103665E03

  1. Turn the ignition switch off and remove the service plug grip. (Click here)

    NOTICE:
    Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.

  1. Remove the inverter cover. (Click here)

    NOTICE:
    1. Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
    2. Prevent water in the reservoir tank from entering the inverter.
    3. Removing the inverter cover causes the MG ECU board to be exposed. Therefore, temporarily install the inverter cover for each area to be inspected.

  1. Check the connections of the MG ECU connectors.

    OK:
    Connectors are connected securely and there is no poor connection.



NG
CONNECT SECURELY
OK


2.INSPECT GENERATOR RESOLVER

NOTICE:
Be sure to wear insulated gloves.



    A103666E03

  1. Disconnect the I24 connector from the MG ECU.

  1. 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
    		Specified Condition
    GRF (I24-12) - Body ground
    		Below 1 V
    GRFG (I24-22) - Body ground
    		Below 1 V
    GSN (I24-11) - Body ground
    		Below 1 V
    GSNG (I24-10) - Body ground
    		Below 1 V
    GCS (I24-9) - Body ground
    		Below 1 V
    GCSG (I24-8) - Body ground
    		Below 1 V

    NOTICE:
    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.

  1. Turn the ignition switch off.

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

    Standard Resistance (Check for open):
    Tester Connection
    		Specified Condition
    GRF (I24-12) - GRFG (I24-22)
    		7.65 to 10.2 Ω
    GSN (I24-11) - GSNG (I24-10)
    		12.6 to 16.8 Ω
    GCS (I24-9) - GCSG (I24-8)
    		12.6 to 16.8 Ω

    Standard Resistance (Check for short):
    Tester Connection
    		Specified Condition
    GRF (I24-12) or GRFG (I24-22) - Body ground
    		10 kΩ or higher
    GSN (I24-11) or GSNG (I24-10) - Body ground
    		10 kΩ or higher
    GCS (I24-9) or GCSG (I24-8) - Body ground
    		10 kΩ or higher



OK
REPLACE W/ CONVERTER INVERTER ASSEMBLY
NG


3.CHECK CONNECTION CONDITION OF GENERATOR RESOLVER CONNECTOR (LOOSENESS AND POOR CONTACT)


    A105167

  1. Remove the w/ converter inverter assembly. (Click here)

  1. Check the connection of the generator resolver connector.

    OK:
    Connector is connected securely and there is no poor connection.



NG
CONNECT SECURELY
OK


4.INSPECT GENERATOR RESOLVER


    A105163E02

  1. Disconnect the M6 generator resolver connector.

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

    Standard Resistance:
    Tester Connection
    		Specified Condition
    GRF (M6-1) - GRFG (M6-6)
    		7.65 to 10.2 Ω
    GSN (M6-2) - GSNG (M6-7)
    		12.6 to 16.8 Ω
    GCS (M6-3) - GCSG (M6-8)
    		12.6 to 16.8 Ω

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

    Standard Resistance:
    Tester Connection
    		Specified Condition
    GRF (M6-1) - GSN (M6-2)
    		10 MΩ or higher
    GRF (M6-1) - GCS (M6-3)
    		10 MΩ or higher
    GSN (M6-2) - GCS (M6-3)
    		10 MΩ or higher
    GRFG (M6-6) - GSNG (M6-7)
    		10 MΩ or higher
    GRFG (M6-6) - GCSG (M6-8)
    		10 MΩ or higher
    GSNG (M6-7) - GCSG (M6-8)
    		10 MΩ or higher
    Each terminal listed above - Transaxle housing
    		10 MΩ or higher



NG
REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR