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TIRE PRESSURE WARNING SYSTEM ECU Power Source Circuit

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DTC Code DTC Name
  ECU Power Source Circuit
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DESCRIPTION

The IG circuit is the power source for the tire pressure warning ECU and receiver.

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WIRING DIAGRAM

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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.

Tip:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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PROCEDURE


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    CHECK HARNESS AND CONNECTOR (ECU - AUXILIARY BATTERY AND BODY GROUND)


    1. A0008GTE04

      Disconnect the P29 or P25 tire pressure warning ECU and receiver connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Table 1. for FMVSS138 Type
      Tester Connection Condition Specified Condition
      P29-1 (IG) - Body ground Power switch on (IG) 10 to 16 V
      Power switch off Below 1 V
      Table 2. for ECE-R64 Type
      Tester Connection Condition Specified Condition
      P25-1 (IG) - Body ground Power switch on (IG) 10 to 16 V
      Power switch off Below 1 V

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

      Standard Resistance
      Table 3. for FMVSS138 Type
      Tester Connection Condition Specified Condition
      P29-12 (GND) - Body ground Always Below 1 Ω
      Table 4. for ECE-R64 Type
      Tester Connection Condition Specified Condition
      P25-12 (GND) - Body ground Always Below 1 Ω
      Table 5. Text in Illustration
      *A for FMVSS138 Type
      *B for ECE-R64 Type
      *a

      Front view of wire harness connector

      (to Tire Pressure Warning ECU and Receiver)

    • OK

      REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR