DTC    P0A1B-168    Drive Motor "A" Control Module

DTC    P0A1B-795    Drive Motor "A" Control Module

DTC    P0A1B-796    Drive Motor "A" Control Module

for Preparation Click here


DESCRIPTION

The MG ECU monitors internal operations and detects a malfunction.

DTC No.
INF Code
DTC Detection Condition
Trouble Area
P0A1B
168
Resolver angle error
  1. w/ converter inverter assembly (MG ECU)
  2. Hybrid vehicle transaxle assembly (motor resolver)
  3. Wire harness or connector
↑
795
REF frequency error
  1. w/ converter inverter assembly (MG ECU)
  2. Hybrid vehicle transaxle assembly (motor resolver)
  3. Wire harness or connector
↑
796
REF signal transmission stop error
  1. w/ converter inverter assembly (MG ECU)
  2. Hybrid vehicle transaxle assembly (motor resolver)
  3. Wire harness or connector

MONITOR DESCRIPTION

The MG ECU performs many diagnostic tests to verify proper operation of internal ECU systems. In this diagnostic monitor, the MG ECU checks for an R/D (Resolver/Digital Converter) malfunction involving the motor resolver. If MG ECU detects an R/D error, it will conclude that there is an internal malfunction involving the motor resolver. The HV control ECU will illuminate the MIL and set a DTC.

WIRING DIAGRAM


A113951E05


INSPECTION PROCEDURE

1.READ OUTPUT DTC (HV)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to the ON position.

  1. Select the following menu items: Powertrain / Hybrid Control / DTC.

  1. Read output DTC. (Click here)

    Result:
    The DTCs shown in the table below are output:

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



YES
GO TO DTC CHART
NO


2.CHECK HARNESS AND CONNECTOR (MG ECU - MOTOR RESOLVER)

CAUTION:
Be sure to wear insulated gloves.

  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.



    A103666E04

  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
    MRF (I24-13) - Body ground
    		Below 1 V
    MRFG (I24-23) - Body ground
    		Below 1 V
    MSN (I24-21) - Body ground
    		Below 1 V
    MSNG (I24-20) - Body ground
    		Below 1 V
    MSC (I24-19) - Body ground
    		Below 1 V
    MRF (I24-18) - 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
    MRF (I24-13) - MRFG (I24-23)
    		7.65 to 10.2 Ω
    MSN (I24-21) - MSNG (I24-20)
    		12.6 to 16.8 Ω
    MCS (I24-19) - MCSG (I24-18)
    		12.6 to 16.8 Ω

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

    Standard Resistance (Check for short):
    Tester Connection
    		Specified Condition
    MSF (I24-13) or MRFG (I24-23) - Body ground
    		10 kΩ or higher
    MSN (I24-21) or MSNG (I24-20) - Body ground
    		10 kΩ or higher
    MGCS (I24-19) or MCSG (I24-18) - Body ground
    		10 kΩ or higher



OK
CHECK W/ CONVERTER INVERTER ASSEMBLY
NG


3.INSPECT MOTOR RESOLVER


    A083675E04

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

    Standard Resistance:
    Tester Connection
    		Specified Condition
    MRF (M7-1) - MRFG (M7-4)
    		7.65 to 10.2 Ω
    MSN (M7-2) - MSNG (M7-5)
    		12.6 to 16.8 Ω
    MCS (M7-3) - MCSG (M7-6)
    		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
    MRF (M7-1) - MSN (M7-2)
    		10 MΩ or higher
    MRF (M7-1) - MCS (M7-2)
    		10 MΩ or higher
    MSN (M7-2) - MSN (M7-3)
    		10 MΩ or higher
    MRFG (M7-4) - MSNG (M7-5)
    		10 MΩ or higher
    MRFG (M7-4) - MCSG (M7-6)
    		10 MΩ or higher
    MSNG (M7-5) - MCSG (M7-6)
    		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