TIRE PRESSURE WARNING SYSTEM, Diagnostic DTC:C2151/51, C2152/52

DTC Code DTC Name
C2151/51 Front Initiator Circuit (Open)
C2152/52 Rear Initiator Circuit (Open)

DESCRIPTION

DTCs C2151/51 and C2152/52 are stored when open circuits are detected in the front tire pressure monitor initiator and rear tire pressure monitor initiator by the tire pressure monitor initiator driver and a malfunction signal is sent to the tire pressure warning ECU and receiver.

DTC No. DTC Detection Condition Trouble Area
C2151/51 When there is an open circuit in the front tire pressure monitor initiator, the vehicle is driven at a speed of 8 km/h (5 mph) or more for a total of 30 seconds.

  • Front tire pressure monitor initiator

  • Wire harness or connector

  • Tire pressure monitor initiator driver
C2152/52 When there is an open circuit in the rear tire pressure monitor initiator, the vehicle is driven at a speed of 8 km/h (5 mph) or more for a total of 30 seconds.

  • Rear tire pressure monitor initiator

  • Wire harness or connector

  • Tire pressure monitor initiator driver

WIRING DIAGRAM

A01FFS7E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK WAVEFORM


    1. A01FDU2E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Front Tire Pressure Monitor Initiator)
      *b

      Front view of wire harness connector

      (to Rear Tire Pressure Monitor Initiator)
      *c Example
      *d GND

      Turn the engine switch off.

    2. When DTC C2151/51 is output:


      1. Disconnect the front tire pressure monitor initiator connector.

    3. When DTC C2152/52 is output:


      1. Disconnect the rear tire pressure monitor initiator connector.

    4. Using an oscilloscope, check waveform.

      Waveform
      Item Contents
      Terminal

      A11-1 (F IN) - A11-2 (F OT)

      U39-1 (R IN) - U39-2 (R OT)
      Tool setting 1 V/DIV, 100 μs./DIV.
      Vehicle condition Engine switch on (IG)
      OK
      Voltage alternates between "high" and "low" voltage.
      Result
      Result Proceed to
      NG A
      OK (when DTC C2151/51 is output) B
      OK (when DTC C2152/52 is output) C

    B

    REPLACE FRONT TIRE PRESSURE MONITOR INITIATOR Click here

    C

    REPLACE REAR TIRE PRESSURE MONITOR INITIATOR Click here

    A

  2. CHECK HARNESS AND CONNECTOR (FRONT/REAR TIRE PRESSURE MONITOR INITIATOR - TIRE PRESSURE MONITOR INITIATOR DRIVER)


    1. Turn the engine switch off.

    2. When DTC C2151/51 is output:


      1. Disconnect the front tire pressure monitor initiator A11 connector.

    3. When DTC C2152/52 is output:


      1. Disconnect the rear tire pressure monitor initiator U39 connector.

    4. Disconnect the tire pressure monitor initiator driver N99 connector.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      When DTC C2151/51 is output:
      Tester Connection Condition Specified Condition
      A11-1 (F IN) - N99-1 (FR+) Always Below 1 Ω
      A11-1 (F IN) - Body ground Always 10 kΩ or higher
      A11-2 (F OT) - N99-2 (FR-) Always Below 1 Ω
      A11-2 (F OT) - Body ground Always 10 kΩ or higher
      When DTC C2152/52 is output:
      Tester Connection Condition Specified Condition
      U39-1 (R IN) - N99-3 (RR+) Always Below 1 Ω
      U39-1 (R IN) - Body ground Always 10 kΩ or higher
      U39-2 (R OT) - N99-4 (RR-) Always Below 1 Ω
      U39-2 (R OT) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    B

    REPLACE TIRE PRESSURE MONITOR INITIATOR DRIVER Click here

    C

    REPLACE TIRE PRESSURE MONITOR INITIATOR DRIVER Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR