TIRE PRESSURE WARNING SYSTEM, Diagnostic DTC:C2154/54

DTC Code DTC Name
C2154/54 Initiator Driver Circuit (Open)

DESCRIPTION

The tire pressure warning ECU and receiver and the tire pressure monitor initiator driver communicate via a direct communication line. When an open circuit between the tire pressure warning ECU and receiver and the tire pressure monitor initiator driver is detected, DTC C2154/54 is stored.

DTC No. DTC Detection Condition Trouble Area
C2154/54 When there is an open circuit between the tire pressure monitor initiator driver and the tire pressure warning ECU and receiver, the vehicle is driven at a speed of 8 km/h (5 mph) or more for a total of 60 seconds.

  • Tire pressure monitor initiator driver

  • Harness or connector

  • Tire pressure warning ECU and receiver

WIRING DIAGRAM

A000XWOE15
*a from IG Circuit
*b ALSI
*c Tire Pressure Monitor Initiator Driver
*d Tire Pressure Warning ECU and Receiver

CAUTION / NOTICE / HINT

Note


  • When replacing the tire pressure warning ECU and receiver, read the transmitter IDs stored in the old ECU using the GTS and write them down before removal.

  • It is necessary to perform initialization (See page ) after registration Click here of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU has been replaced.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR INITIATOR DRIVER IG VOLTAGE)


    1. A000UGZE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Tire Pressure Monitor Initiator Driver)

      Turn the power switch off.

    2. Disconnect the tire pressure monitor initiator driver L168 connector.

    3. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      L168-8 (IG) - Body ground Power switch on (IG) 10 to 16 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      L168-5 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR INITIATOR DRIVER - TIRE PRESSURE WARNING ECU AND RECEIVER)


    1. Turn the power switch off.

    2. Disconnect the tire pressure monitor initiator driver L168 connector.

    3. Disconnect the tire pressure warning ECU and receiver L175 connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L168-6 (SIL) - L175-5 (ALSI) Always Below 1 Ω
      L168-6 (SIL) or L175-5 (ALSI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK WAVEFORM


    1. A000V1WE02
      Text in Illustration
      *a

      Component with harness connected

      (Tire Pressure Monitor Initiator Driver)
      *b Example
      *c GND

      Connect the tire pressure monitor initiator driver L168 connector.

    2. Using an oscilloscope, check the waveform.

      Waveform
      Item Contents
      Terminal L168-6 (SIL) - L168-5 (GND)
      Tool setting 5 V/DIV, 5 ms./DIV.
      Vehicle condition Power switch on (IG)

      Tech Tips

      The waveform in the illustration is only an example for reference. When the voltage alternates between a "high" voltage (the voltage range from 2.2 V below the IG power supply voltage to the IG power supply voltage) and a "low" voltage (the voltage range from 0 to 1.2 V), the tire pressure warning ECU and receiver can be considered to be normal.

      OK
      Voltage alternates between "high" and "low" voltage.
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE TIRE PRESSURE MONITOR INITIATOR DRIVER Click here

    B

    REPLACE TIRE PRESSURE MONITOR INITIATOR DRIVER Click here

    C

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here