RX400h · Service Manual HYBRID SYSTEM

P0A1C-715

Diagnostic trouble codes

DESCRIPTION

The MG ECU monitors internal operations and detects a malfunction.
DTC No.
 INF Code
 DTC Detection Condition
 Trouble Area
P0A1C
 715
 R/D resolver angle error
  1. w/ converter inverter assembly (MG ECU)
  2. Rear traction motor w/ transaxle assembly
  3. Wire harness or connector
↑
 798
 REF frequency error
  1. w/ converter inverter assembly (MG ECU)
  2. Rear traction motor w/ transaxle assembly
  3. Wire harness or connector
↑
 799
 REF signal transmission stop error
  1. w/ converter inverter assembly (MG ECU)
  2. Rear traction motor w/ transaxle assembly
  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 rear motor resolver. If MG ECU detects an R/D error, it will conclude that there is an internal malfunction involving the rear motor resolver. The HV control ECU will illuminate the MIL and set a DTC.

WIRING DIAGRAM

A113953E02

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.

HINT:
At least 5 minutes is required to discharge the high-voltage capacitor inside the w/ converter inverter assembly.


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:
    Any of the following DTCs are output:
    DTC No.
    		 Relevant Diagnosis
    P0A3F-669, P0A46-671, P0A47-670
    		 Rear Motor resolver circuit



YES
GO TO DTC CHART
NO


2. CHECK HARNESS AND CONNECTOR (MG ECU - BODY GROUND)

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 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. A103667E04
    Disconnect the I25 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
    RRF (I25-21) - Body ground
    		 Below 1 V
    RRFG (I25-22) - Body ground
    		 Below 1 V
    RSN (I25-29) - Body ground
    		 Below 1 V
    RSNG (I25-30) - Body ground
    		 Below 1V
    RCS (I25-11) - Body ground
    		 Below 1 V
    RCSG (I25-23) - 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:
    Tester Connection
    		 Specified Condition
    RRF (I25-21) - RRFG (I25-22)
    		 7.65 to 10.2 Ω
    RSN (I25-29) - RSNG (I25-30)
    		 12.6 to 16.8 Ω
    RCS (I25-11) - RCSG (I25-23)
    		 12.6 to 16.8 Ω

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

    Standard Resistance:
    Tester Connection
    		 Specified Condition
    RRF (I25-21) or RRFG (I25-22) - Body ground
    		 10 kΩ or higher
    RSN (I25-29) or RSNG (I25-30) - Body ground
    		 10 kΩ or higher
    RCS (I25-11) or RCSG (I25-23) - Body ground
    		 10 kΩ or higher



OK
REPLACE W/ CONVERTER INVERTER ASSEMBLY
NG


3. INSPECT REAR MOTOR RESOLVER

  1. A083675E05
    Disconnect the M11 rear motor resolver connector.

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

    Standard Resistance:
    Tester Connection
    		 Specified Condition
    RRF (M11-1) - RRFG (M11-4)
    		 7.65 to 10.2 Ω
    RSN (M11-2) - RSNG (M11-5)
    		 12.6 to 16.8 Ω
    RCS (M11-3) - RCSG (M11-6)
    		 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
    RRF (M11-1) - RSN (M11-2)
    		 10 MΩ or higher
    RRF (M11-1) - RCS (M11-3)
    		 10 MΩ or higher
    RSN (M11-2) - RCS (M11-3)
    		 10 MΩ or higher
    RRFG (M11-4) - RSNG (M11-5)
    		 10 MΩ or higher
    RRFG (M11-4) - RCSG (M11-6)
    		 10 MΩ or higher
    RSNG (M11-5) - RCSG (M11-6)
    		 10 MΩ or higher
    Each terminal listed above - Transaxle housing
    		 10 MΩ or higher

    HINT:
    The rear motor resolver is not available as a single product. If it requires replacement, replace the rear traction motor w/ transaxle assembly.



 NG
REPLACE REAR TRACTION MOTOR W/TRANSAXLE ASSEMBLY
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR


← P0A1C-706P0A1D-134 →