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. Detection Item DTC Detection Condition Trouble Area Note
C2151/51 Front Initiator Circuit (Open) There is an open circuit in the front tire pressure monitor initiator and 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

 w/ Tire Inflation Pressure Display Function
C2152/52 Rear Initiator Circuit (Open) There is an open circuit in the rear tire pressure monitor initiator and 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

 w/ Tire Inflation Pressure Display Function

WIRING DIAGRAM

B003Y0GE09
*a from IG Circuit
*b Front Tire Pressure Monitor Initiator
*c Rear Tire Pressure Monitor Initiator
*d Tire Pressure Monitor Initiator Driver

PROCEDURE


  1. CHECK WAVEFORM


    1. B003YNWC17
      *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 power switch off.

    2. When DTC C2151/51 is output:


      1. Disconnect the A87 front tire pressure monitor initiator connector.

    3. When DTC C2152/52 is output:


      1. Disconnect the Q69 rear tire pressure monitor initiator connector.

    4. Using an oscilloscope, check waveform.

      Waveform
      Item Contents
      Terminal

      A87-1 (F IN) - A87-2 (F OT)

      Q69-1 (R IN) - Q69-2 (R OT)
      Tool setting 1 V/DIV, 100 μs./DIV.
      Vehicle condition Power 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 power switch off.

    2. When DTC C2151/51 is output:


      1. Disconnect the A87 front tire pressure monitor initiator connector.

    3. When DTC C2152/52 is output:


      1. Disconnect the Q69 rear tire pressure monitor initiator connector.

    4. Disconnect the K163 tire pressure monitor initiator driver 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
      A87-1 (F IN) - K163-1 (FR+) Always Below 1 Ω
      A87-1 (F IN) or K163-1 (FR+) - Body ground Always 10 kΩ or higher
      A87-2 (F OT) - K163-2 (FR-) Always Below 1 Ω
      A87-2 (F OT) or K163-2 (FR-) - Body ground Always 10 kΩ or higher
      When DTC C2152/52 is output
      Tester Connection Condition Specified Condition
      Q69-1 (R IN) - K163-3 (RR+) Always Below 1 Ω
      Q69-1 (R IN) or K163-3 (RR+) - Body ground Always 10 kΩ or higher
      Q69-2 (R OT) - K163-4 (RR-) Always Below 1 Ω
      Q69-2 (R OT) or K163-4 (RR-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TIRE PRESSURE MONITOR INITIATOR DRIVER Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR