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Home >> Toyota >> 2006 >> Prius >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> P112 Hybrid Vehicle Control - DTC P0A94 - P3226, U0100 - U0146 >> DTC P0AE7-224 Hybrid Battery Precharge Contractor Control Circuit High; DTC P0AE6-225 Hybrid Battery Precharge Contractor Control Circuit Low >> Inspection Procedure

Inspection Procedure

CAUTION:
  • 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 servicing the high-voltage system.
  • 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 are required to discharge the high-voltage condenser inside the inverter.

  1. INSPECT NO. 1 SYSTEM MAIN RELAY 
    1. Inspect the No. 1 system main relay (See INSPECTION ).

    NG : REPLACE NO. 1 SYSTEM MAIN RELAY 

    OK : GO TO NEXT STEP 

  2. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 1 SYSTEM MAIN RELAY) 
    CAUTION: Wear insulated gloves before performing the following operation.
    1. Turn the power switch OFF.
    2. Remove the service plug grip (See REMOVAL ).
      NOTE: Turning the power switch ON (READY) with the service plug grip removed could cause malfunction. Therefore, never turn the power switch ON (READY) in this state.
    3. Disconnect the H16 HV control ECU connector.
      Fig 1: Disconnecting H16 HV Control ECU Connector
      G04473630Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Disconnect the S22 No. 1 system main relay connector.
    5. Turn the power switch ON (IG).

      HINT:

      DTCs for the interlock switch system are output when turning the power switch ON (IG) with the service plug grip removed.

    6. Measure the voltage between the terminal of the HV control ECU connector and body ground.
      Fig 2: Identifying System Main Relay Connector
      G04473631Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      TERMINALS VOLTAGE SPECIFICATION

      Tester Connection Specified Condition
      CON1 (H16-1) - Body ground Below 1 V
    7. Turn the power switch OFF.
    8. Measure the resistance between the wire harness side connectors.

      Standard resistance (Check for open) 

      TERMINALS RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      CON1 (H16-1) - CON1 (S22-1) Below 1 Ω

      Standard resistance (Check for short) 

      TERMINALS RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      CON1 (H16-1) or CON1 (S22-1) - Body ground 10 kΩ or higher
    9. Reconnect the No. 1 system main relay connector.
    10. Reconnect the HV control ECU connector.
    11. Reinstall the service plug grip (See INSTALLATION ).

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : REPLACE HYBRID VEHICLE CONTROL ECU 

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