Terminals Of Ecu

HINT:

Inspect the connectors from the back side.

1. CHECK TIRE PRESSURE WARNING ECU AND RECEIVER 
   Fig 1: Identifying Tire Pressure Warning ECU And Receiver

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the T25 ECU connector.
   2. Measure the voltage according to the value(s) in the table below.
      VOLTAGE CHART
      
      

      Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
      T25-1 (IG) - T25-9 (GND)	B-W - W-B	IG power source	Ignition switch ON	10 to 16 V

   3. Connect the T25 ECU connector.
   4. Measure the voltage and resistance according to the value(s) in the table below.
      VOLTAGE CHART
      
      

      Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
      T25-3 (SPD) - T25-9 (GND)	V-W - W-B	Vehicle speed signal	Vehicle is running	Pulse generation (see  2waveform 1)
      T25-4 (SIL) - T25-9 (GND)	V-W - W-B	Diagnosis tester communication line	Ignition switch ON, when communication is not performed with a tester	8 to 15 V
      T25-5 (IND) - T25-9 (GND)	G-R - W-B	Tire pressure warning light output signal	Ignition switch ON, tire pressure warning light ON	Below 0.5 V
      T25-8 (CALSW) - T25-9 (GND)	G-W - W-B	Tire pressure warning reset switch	Ignition switch ON Tire pressure warning reset switch OFF	8 to 15 V
      T25-8 (CALSW) - T25-9 (GND)	G-W - W-B	Tire pressure warning reset switch	Ignition switch ON Tire pressure warning reset switch ON	Below 1.5 V
      T25-7 (IDSW) - T25-9 (GND)	G - W-B	Tire pressure warning select switch	Ignition switch ON Tire pressure warning select switch ON	Below 1.5 V
      T25-7 (IDSW) - T25-9 (GND)	G - W-B	Tire pressure warning select switch	Ignition switch ON Tire pressure warning select switch OFF	8 to 15 V
      T25-9 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
      T25-10 (TC) - T25-9 (GND)	P-B - W-B	TC terminal	When terminal TC is not connected	8 to 15 V

      If the result is not as specified, the ECU may have a malfunction.

2. Waveform 1 (Reference) 
   1. Waveform
   WAVEFORM REFERENCE CHART
   
   

   Item	Contents
   Terminal No. (Symbols)	T25-3 (SPD) - T25-9 (GND)
   Tool setting	5V/DIV.,200 ms/DIV.
   Vehicle condition	While driving at approximately 20 km/h (12 mph).

   Fig 2: Waveform 1 Reference

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002