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Home >> Lexus >> 2009 >> LS 600hL >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Vehicle Control (Diagnostic Codes (P0A7A-324 - P1557-887)) >> Hybrid Control System >> DTC P0A90-251: Drive Motor "A" Performance >> Procedure

DTC P0A90-251: Drive Motor "A" Performance: Procedure

  1. CHECK DTC OUTPUT (HV) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
    4. Check if DTCs are output.

      Result

      Result Proceed to
      P0A90-251 only is output. A
      Any of the following DTCs are also output. B
      DTC No. Relevant Diagnosis
      P0A1A (all INF codes) *1 Generator Control Module
      P0A1B (all INF codes) *1 Drive Motor "A" Control Module
      P0A1D (all INF codes) *1 Hybrid Powertrain Control Module
      P0A3F-243 Drive Motor "A" Position Sensor Circuit
      P0A40-500 Drive Motor "A" Position Sensor Circuit Range / Performance
      P0A41-245 Drive Motor "A" Position Sensor Circuit Low
      P0A4B-253 Generator Position Sensor Circuit
      P0A4C-513 Generator Position Sensor Circuit Range / Performance
      P0A4D-255 Generator Position Sensor Circuit Low
      P0A60 (all INF codes) *1 Drive Motor "A" Phase V Current
      P0A63 (all INF codes) *1 Drive Motor "A" Phase W Current
      P0A72 (all INF codes) *1 Generator Phase V Current
      P0A75 (all INF codes) *1 Generator Phase W Current
      P0A78-266, 267, 306, 523, 586 Drive Motor "A" Inverter Performance
      P0A7A-344 Generator Inverter Performance
      P0A90-509 Drive Motor "A" Performance
      P0A92-521 Hybrid Generator Performance
      P0A94-585, 587, 589, 590 DC / DC Converter Performance
      P0AA6 (all INF codes) *1 Hybrid Battery Voltage System Isolation Fault
      P3004-132 Power Cable Malfunction
      P3233-750 Short to B+ in Blocking of HV Gate Connection

      HINT: 

      • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic flowchart.
      • P0A90-251 may be set due to a malfunction which also causes DTCs in the preceding table to be set. In this case, first troubleshoot the output DTCs in the preceding table. Then, perform a test to attempt to reproduce the problems, and check that no DTCs are output.

    B → See step   6 

    A: Go to next step 

  2. SIMULATION TEST 
    1. Test-drive the vehicle at a speed of 25 mph (40 km/h) for approximately 1 minute.
    2. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
    3. Check if DTCs are output.

      Result

      Result Proceed to
      P0A90-251 is output or no DTC is output. A
      P0A78-306 or P0A90-509 is output. B

    B → See step   6 

    A: Go to next step 

  3. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) 
    NOTE:

    Before disconnecting the connector, confirm that it is properly connected by checking that the locking claws are engaged and that the connector does not pull out.

    1. Check the connection of the low voltage connector of the inverter with converter assembly.
      Fig 1: Identifying Inverter With Converter Assembly
      GTY147638Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      The connector is connected securely and there are no contact problems.

      HINT: 

      When connecting the connector, insert it with the locking lever in the raised position. Rotate the lever downward and make sure that the connector is pulled into its socket. When the locking lever is in its fully closed position, a click will be heard as its locking claws engage. After the click is heard, pull up on the connector to confirm that it is properly connected.

    NG → CONNECT SECURELY 

    OK: Go to next step 

  4. CHECK INVERTER WITH CONVERTER ASSEMBLY (MOTOR CABLE CONNECTION CONDITION) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Turn the power switch off.
    2. Remove the service plug grip. Refer to PRECAUTION .
      NOTE:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair information because this may cause a malfunction.

    3. Remove the inverter terminal cover from the inverter with converter assembly.
      Fig 2: Locating Service Plug
      GTY128397Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Check that the bolts for the motor cable are tightened to the specified torque, the motor cable is connected securely, and there are no contact problems.
      Fig 3: Identifying Generator Cable Bolts
      GTY148105Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Specified Condition

      T=8.0 N*m {82 kgf*cm, 71 in.*lbf}

      NOTE:

      Make sure that the tightening torque of the bolts is between 6.4 and 9.6 N*m (65 and 98 kgf*cm, 57 and 85 in.*lbf).

    5. Check for arc marks at the bolts for the motor cable.

      Result

      Result Proceed to
      The terminals are connected securely and there are no contact problems. There are no arc marks. A
      The terminals are not connected securely and there is a contact problem. There are arc marks. B
      The terminals are not connected securely and there is a contact problem. There are no arc marks. C
      The terminals are connected securely and there are no contact problems. There are arc marks. B

    C → CONNECT SECURELY 

    B → REPLACE MALFUNCTIONING PARTS 

    A: Go to next step 

  5. CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (MOTOR CABLE CONNECTION CONDITION) 
    1. Remove the hybrid vehicle transmission assembly. Refer to REMOVAL .
      Fig 4: Locating Motor Cable Bolts
      GTY124480Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that the bolts for the motor cable are tightened to the specified torque, the motor cable is connected securely, and there are no contact problems.

      Specified Condition

      T=8.0 N*m {82 kgf*cm, 71 in.*lbf}

      NOTE:

      Make sure that the tightening torque of the bolts is between 6.4 and 9.6 N*m (65 and 98 kgf*cm, 57 and 85 in.*lbf).

    3. Check for arc marks at the bolts for the motor cable.

      Result

      Result Proceed to
      The terminals are connected securely and there are no contact problems. There are no arc marks. A
      The terminals are not connected securely and there is a contact problem. There are arc marks. B
      The terminals are not connected securely and there is a contact problem. There are no arc marks. C
      The terminals are connected securely and there are no contact problems. There are arc marks. B

    C → CONNECT SECURELY 

    B → REPLACE MALFUNCTIONING PARTS 

    A → See step   7 

  6. GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  7. REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY. Refer to  REMOVAL 
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