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Home >> Scion >> 2014 >> iQ EV >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System (Diagnostic Codes P0516-769 - P0A90-251) (Electric) >> Hybrid Control System >> DTC P0A90-251: Drive Motor "A" Performance >> Procedure

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

  1. CHECK DTC OUTPUT (EV) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / EV / Trouble Codes.
    4. Check if DTCs related to the EV control system are output.

      Result

      Result Proceed to
      Only P0A90-251 is output or P0A90-251 and DTCs other than the ones in the table below are also 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 EV Control Module
      P0A60 (all INF codes)*1 Drive Motor "A" Phase V Current
      P0A63 (all INF codes)*1 Drive Motor "A" Phase W Current
      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
      P0A51-174 Drive Motor "A" Current Sensor Circuit
      P0A78-202, 266, 267, 306, 586 Drive Motor "A" Inverter Performance
      P0A90-509 Drive Motor "A" Performance
      P0AA6 (all INF codes)*1 EV Battery Voltage System Isolation Fault
      P0C76-523 EV Battery System Discharge Time Too Long
      P3004-132 High Voltage Power Resource
      P3233-750 Open or Short to B+ in Blocking of EV Gate Connection

      HINT: 

      • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
      • P0A90-251 may be output due to a malfunction which causes the DTCs in the table above to be output. In this case, first troubleshoot the output DTCs in the table above. Then, perform a reproduction test to check that no DTCs are output.
    5. Turn the power switch off.

    B → See step   7 

    A: Go to next step 

  2. SIMULATION TEST 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (READY).
    3. Test-drive the vehicle at a speed of 40 km/h (25 mph) for approximately 1 minute.
      NOTE:

      Perform this road test only in an appropriate safe location, in accordance with all local laws.

    4. Enter the following menus: Powertrain / EV / Trouble Codes.
    5. Check if DTCs related to the EV control system are output.

      Result

      Result Proceed to
      P0A90-251 is output or no DTC is output. A
      P0A78-306 or P0A90-509 is output. B
    6. Turn the power switch off.

    B → See step   7 

    A: Go to next step 

  3. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) See step   7 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  4. CHECK INVERTER WITH CONVERTER ASSEMBLY (MOTOR CABLE CONNECTION CONDITION) See step   6 

    B → REPLACE MALFUNCTIONING PARTS 

    C → CONNECT SECURELY 

    A: Go to next step 

  5. CHECK EV TRANSAXLE WITH MOTOR ASSEMBLY (MOTOR CABLE CONNECTION CONDITION) See step   18 

    B → REPLACE MALFUNCTIONING PARTS 

    C → CONNECT SECURELY 

    A: Go to next step 

  6. CHECK MOTOR CABLE See step   19 

    NG → See step   9 

    OK → See step   8 

  7. GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  8. REPLACE EV TRANSAXLE WITH MOTOR ASSEMBLY. Refer to  COMPONENTS 
  9. REPLACE MOTOR CABLE. Refer to  COMPONENTS 
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