RX400h · Service Manual HYBRID SYSTEM

P0A1A-200

Diagnostic trouble codes

DESCRIPTION

The MG ECU monitors internal operations and detects a malfunction.
DTC No.
 INF Code
 DTC Detection Condition
 Trouble Area
P0A1A
 200
 R/D resolver angle error
  1. w/ converter inverter assembly (MG ECU)
  2. Hybrid vehicle transaxle assembly (generator resolver)
  3. Wire harness or connector
↑
 792
 REF frequency error
  1. w/ converter inverter assembly (MG ECU)
  2. Hybrid vehicle transaxle assembly (generator resolver)
  3. Wire harness or connector
↑
 793
 REF signal transmission stop error
  1. w/ converter inverter assembly (MG ECU)
  2. Hybrid vehicle transaxle assembly (generator 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 generator resolver. If MG ECU detects an R/D error, it will conclude that there is an internal malfunction involving the generator resolver. The HV control ECU will illuminate the MIL and set a DTC.

WIRING DIAGRAM

A113951E04

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
    P0A4B-253, P0A4C-513, P0A4D-255
    		 Generator resolver circuit



YES
GO TO DTC CHART
NO


2. CHECK HARNESS AND CONNECTOR (MG ECU - GENERATOR 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.
    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. A103666E03
    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
    GSC (I24-9) - Body ground
    		 Below 1 V
    GRF (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
    GSF (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

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

    Standard Resistance (Check for short):
    Tester Connection
    		 Specified Condition
    GSF (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. INSPECT GENERATOR RESOLVER

  1. A105163E02
    Remove the w/ converter inverter. (Click here)

  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)
    		 7.65-10.2 Ω
    GSN (M6-2) - GSNG ((M6-7)
    		 12.6-16.8 Ω
    GCS (M6-3) - GCSG (M6-8)
    		 12.6-16.8 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

    HINT:
    The generator 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


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