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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 P0A94-172: DC / DC Converter Performance >> Procedure

DTC P0A94-172: DC / DC Converter 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
      P0A94-172 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
      P0A78-113, 128, 266, 267, 279, 284, 286, 287, 306, 503, 504, 505, 506, 523, 586, 806, 807, 808 Drive Motor "A" Inverter Performance
      P0A7A-122, 130, 322, 324, 325, 344, 517, 518, 809, 810, 811 Generator Inverter Performance
      P0A90-509 Drive Motor "A" Performance
      P0A92-521 Hybrid Generator Performance
      P0A94-442, 547, 548, 549, 554, 555, 556, 585, 587, 589, 590 DC / DC Converter Performance
      P0AA6-526 Hybrid Battery Voltage System Isolation Fault
      P0AA7-727 Hybrid Battery Voltage Isolation Sensor Circuit

      HINT: 

      • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic flowchart.
      • P0A94-172 may be set due to a malfunction which also causes the 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   25 

    A: Go to next step 

  2. CHECK AMOUNT OF GASOLINE 
    1. Turn the power switch on (IG).
    2. Check the amount of fuel by referring to the fuel gauge in the meter.

      OK

      Proper amount of fuel is in the tank.

      HINT: 

      • If the vehicle is driven when there is no fuel in the tank, MG1 will crank the engine but the engine will not start. For this reason, an inoperative condition of MG1 may be detected.
      • Add fuel until the low fuel level warning light turns off.

    NG → REFUEL VEHICLE 

    OK: Go to next step 

  3. CHECK ENGINE START 
    1. Turn the power switch on (READY).
    2. Check if the engine starts.

      HINT: 

      Depressing the accelerator pedal with the shift lever in the P position will cause the engine to start.

      Result

      Result Proceed to
      The engine does not start. A
      The engine starts. B

    B → See step   6 

    A: Go to next step 

  4. CHECK CRANKSHAFT PULLEY REVOLUTION (P POSITION) 
    1. Turn the power switch off.
    2. Move the shift lever to the P position and lift up the vehicle.
    3. Turn the crankshaft pulley using hand tools to check if the crankshaft can rotate smoothly.
      WARNING:

      Do not turn the power switch on (READY) while performing this inspection. Be sure to turn the power switch off before performing this inspection, to prevent the engine from starting.

      Result

      Result Proceed to
      The crankshaft does not rotate smoothly. A
      The crankshaft rotates smoothly. B

    B → See step   6 

    A: Go to next step 

  5. CHECK CRANKSHAFT PULLEY REVOLUTION (N POSITION) 
    1. Lower the vehicle.
    2. Turn the power switch off.
    3. Move the shift lever to the N position and lift up the vehicle.
    4. Turn the crankshaft pulley using hand tools to check if the crankshaft can rotate smoothly.
      WARNING:

      Do not turn the power switch on (READY) while performing this inspection. Be sure to turn the power switch off before performing this inspection, to prevent the engine from starting.

      Result

      Result Proceed to
      The crankshaft does not rotate smoothly. A
      The crankshaft rotates smoothly. B

    B → See step   26 

    A → REPAIR OR REPLACE ENGINE 

  6. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR). Refer to  PROCEDURE - Step 3 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER). Refer to  PROCEDURE - Step 4 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  8. CHECK GENERATOR RESOLVER. Refer to  PROCEDURE - Step 5 

    NG → See step   17 

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER). Refer to  PROCEDURE - Step 6 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  10. CHECK MOTOR RESOLVER. Refer to  PROCEDURE - Step 7 

    NG → See step   19 

    OK: Go to next step 

  11. CHECK INVERTER WITH CONVERTER ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION). Refer to  PROCEDURE - Step 8 

    C → CONNECT SECURELY 

    B → REPLACE MALFUNCTIONING PARTS 

    A: Go to next step 

  12. CHECK INVERTER WITH CONVERTER ASSEMBLY (MOTOR CABLE CONNECTION CONDITION). Refer to  PROCEDURE - Step 9 

    C → CONNECT SECURELY 

    B → REPLACE MALFUNCTIONING PARTS 

    A: Go to next step 

  13. CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (MG1). Refer to  PROCEDURE - Step 10 

    NG → See step   21 

    OK: Go to next step 

  14. CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (MG2). Refer to  PROCEDURE - Step 11 

    NG → See step   23 

    OK: Go to next step 

  15. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR). Refer to  PROCEDURE - Step 12 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  16. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR). Refer to  PROCEDURE - Step 13 

    NG → CONNECT SECURELY 

    OK → See step   27 

  17. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR). Refer to  PROCEDURE - Step 14 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  18. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY (MG ECU)-GENERATOR RESOLVER). Refer to  PROCEDURE - Step 15 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   26 

  19. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR). Refer to  PROCEDURE - Step 16 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  20. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY (MG ECU)-MOTOR RESOLVER). Refer to  PROCEDURE - Step 17 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   26 

  21. CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION). Refer to  PROCEDURE - Step 18 

    C → CONNECT SECURELY 

    B → REPLACE MALFUNCTIONING PARTS 

    A: Go to next step 

  22. CHECK GENERATOR CABLE. Refer to  PROCEDURE - Step 19 

    NG → See step   28 

    OK → See step   26 

  23. CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (MOTOR CABLE CONNECTION CONDITION). Refer to  PROCEDURE - Step 20 

    C → CONNECT SECURELY 

    B → REPLACE MALFUNCTIONING PARTS 

    A: Go to next step 

  24. CHECK MOTOR CABLE. Refer to  PROCEDURE - Step 21 

    NG → See step   29 

    OK → See step   26 

  25. GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  26. REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY. Refer to  REMOVAL 
  27. REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to  REMOVAL 
  28. REPLACE GENERATOR CABLE. Refer to  REMOVAL 
  29. REPLACE MOTOR CABLE. Refer to  REMOVAL 
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