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Home >> Scion >> 2014 >> iQ EV >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Battery System (Diagnostic Codes & Symptom Tests) (Electric) >> Hybrid Battery System >> DTC U129A-123: Lost Communication with EV Battery No. 2 Pack Sensor Module >> Procedure

DTC U129A-123: Lost Communication with EV Battery No. 2 Pack Sensor Module: Procedure

  1. CHECK DTC OUTPUT (EV BATTERY) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / EV Battery / Trouble Codes.
    5. Read output DTCs.
      RESULT

      Result Proceed to
      Only U129A-123 is output A
      U129A-123 and other DTCs from EV Battery system are also output B
    6. Turn the power switch off.

    B → See step   10 

    A: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (AM2 AND IGC2 VOLTAGE) See step   11 

    NG → See step   6 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - ELECTRIC VEHICLE BATTERY ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      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.

    2. Disconnect the power management control ECU 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.

    3. Disconnect the electric vehicle battery assembly connector.
      Fig 1: Identifying Electric Vehicle Battery Assembly Connector
      GTY392787Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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.
      • Confirm the intermediate connector between the power management control ECU and electric vehicle battery assembly is properly connected by checking that the locking claws are engaged and that the connector does not pull out.
    4. Measure the resistance according to the value(s) in the table below.
      Fig 2: Measuring Resistance Of Power Management Control ECU - Electric Vehicle Battery Assembly Harness & Connector
      GTY386080Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      C22-11 (BH2+) - Gi1-7 Power switch off Below 1 Ω
      C22-10 (BH2-) - Gi1-8 Power switch off Below 1 Ω
      Gi1-20 - Body ground Power switch off Below 1 Ω
      C22-11 (BH2+) or Gi1-7 - Body ground Power switch off 10 kΩ or higher
      C22-10 (BH2-) or Gi1-8 - Body ground Power switch off 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Power Management Control ECU)
      *b Front view of wire harness connector
      (to Electric Vehicle Battery Assembly)
    5. Remove the ECU-B NO. 3 fuse, BATT FAN fuse, IG2 fuse, AM2 fuse and RDI fuse from the No. 1 motor compartment relay block.
    6. Remove the IGCT NO. 3 fuse from the No. 2 motor compartment relay block.
      Fig 3: Identifying ECU-B NO. 3, BATT FAN, IG2, AM2 & RDI Fuses On No. 1 Motor Compartment Relay Block & IGCT No. 3 Fuse On No. 2 Motor Compartment Relay Block
      GTY388402Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 No. 1 Motor Compartment Relay Block *2 ECU-B NO. 3 Fuse
      *3 BATT FAN Fuse *4 IG2 Fuse
      *5 AM2 Fuse *6 RDI Fuse
      *7 No. 2 Motor Compartment Relay Block *8 IGCT NO. 3 Fuse
    7. Disconnect the power management control ECU connector.
    8. Measure the resistance according to the value(s) in the table below.
      Fig 4: Measuring Resistance Of Power Management Control ECU Connector
      GTY386293Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      C22-11 (BH2+) - A24-15 (AM21) Power switch off 10 kΩ or higher
      C22-11 (BH2+) - A23-12 (AM22) Power switch off 10 kΩ or higher
      C22-11 (BH2+) - A23-6 (+B2) Power switch off 10 kΩ or higher
      C22-11 (BH2+) - A24-8 (+B1) Power switch off 10 kΩ or higher
      C22-11 (BH2+) - A24-6 (MREL) Power switch off 10 kΩ or higher
      C22-11 (BH2+) - A24-1 (IG2) Power switch off 10 kΩ or higher
      C22-11 (BH2+) - C21-16 (ACCD) Power switch off 10 kΩ or higher
      C22-11 (BH2+) - C21-15 (IG1D) Power switch off 10 kΩ or higher
      C22-11 (BH2+) - A24-2 (IG2D) Power switch off 10 kΩ or higher
      C22-11 (BH2+) - C22-22 (SPDI) Power switch off 10 kΩ or higher
      C22-11 (BH2+) - A24-9 (FANL) Power switch off 10 kΩ or higher
      C22-11 (BH2+) - A24-13 (FANH) Power switch off 10 kΩ or higher
      C22-11 (BH2+) - A24-12 (FCTL) Power switch off 10 kΩ or higher
      C22-10 (BH2-) - A24-15 (AM21) Power switch off 10 kΩ or higher
      C22-10 (BH2-) - A23-12 (AM22) Power switch off 10 kΩ or higher
      C22-10 (BH2-) - A23-6 (+B2) Power switch off 10 kΩ or higher
      C22-10 (BH2-) - A24-8 (+B1) Power switch off 10 kΩ or higher
      C22-10 (BH2-) - A24-6 (MREL) Power switch off 10 kΩ or higher
      C22-10 (BH2-) - A24-1 (IG2) Power switch off 10 kΩ or higher
      C22-10 (BH2-) - C21-16 (ACCD) Power switch off 10 kΩ or higher
      C22-10 (BH2-) - C21-15 (IG1D) Power switch off 10 kΩ or higher
      C22-10 (BH2-) - A24-2 (IG2D) Power switch off 10 kΩ or higher
      C22-10 (BH2-) - C22-22 (SPDI) Power switch off 10 kΩ or higher
      C22-10 (BH2-) - A24-9 (FANL) Power switch off 10 kΩ or higher
      C22-10 (BH2-) - A24-13 (FANH) Power switch off 10 kΩ or higher
      C22-10 (BH2-) - A24-12 (FCTL) Power switch off 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Power Management Control ECU)
      NOTE:

      When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.

    9. Install the ECU-B NO. 3 fuse, BATT FAN fuse, IG2 fuse, AM2 fuse, RDI fuse and IGCT NO. 3 fuse.
    10. Connect the power management control ECU connector.
    11. Connect the electric vehicle battery assembly connector.

    NG → See step   8 

    OK: Go to next step 

  4. INSPECT POWER MANAGEMENT CONTROL ECU 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      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.

    2. Disconnect the electric vehicle battery assembly connector.
      Fig 5: Identifying Electric Vehicle Battery Assembly Connector
      GTY392787Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Turn the power switch on (IG).
      NOTE:

      Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    5. Measure the voltage according to the value(s) in the table below.
      Fig 6: Measuring Voltage Of Electric Vehicle Battery Assembly Connector
      GTY389603Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      Gi1-7 (+) - Gi1-20 (-) Power switch on (IG) 2.3 to 2.7 V
      Gi1-8 (+) - Gi1-20 (-) Power switch on (IG) 2.3 to 2.7 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Electric Vehicle Battery Assembly)
    6. Turn the power switch off.
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      Gi1-7 - Gi1-8 Power switch off 4.4 to 5.4 kΩ

      HINT: 

      Resistance becomes 2.0 kΩ or less when there is a short circuit in the power management control ECU.

    8. Disconnect the cable from the negative (-) auxiliary battery terminal.
    9. Connect the electric vehicle battery assembly connector.

    NG → See step   9 

    OK: Go to next step 

  5. REPLACE ELECTRIC VEHICLE BATTERY ASSEMBLY 

    Refer to COMPONENTS

    NEXT → See step   11 

  6. CHECK HARNESS AND CONNECTOR (GND2 - BODY GROUND) See step   13 

    NG → See step   8 

    OK: Go to next step 

  7. REPAIR OR REPLACE HARNESS OR CONNECTOR (ECU-B NO. 3 FUSE OR IGCT NO. 3 FUSE - ELECTRIC VEHICLE BATTERY ASSEMBLY) 

    NEXT → See step   11 

  8. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    NEXT → See step   11 

  9. POWER MANAGEMENT CONTROL ECU MUST BE REPLACED 
    1. Even though it has been determined that the power management control ECU needs to be replaced, make sure to inspect the voltage difference between No. 1 EV battery and No. 2 EV battery before replacing it.

    NEXT → See step   11 

  10. GO TO DTC CHART (HYBRID BATTERY SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  11. GO TO NO. 1 EV BATTERY - NO. 2 EV BATTERY VOLTAGE DIFFERENCE INSPECTION. Refer to  No. 1 EV Battery - No. 2 EV Battery Voltage Difference Inspection 
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