Terminals Of Ecu

HINT:

Inspect the connectors from the back side.

Fig 1: Identifying D33 Tire Pressure Warning ECU Connector

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1. Disconnect the 011 tire pressure warning antenna and receiver connector.
2. Measure the voltage according to the value (s) in the table below.
   CONNECTOR TERMINAL REFERENCE
   
   

   Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
   D33-12 (RDA) - D33-9 (GND)	G - W-B	Tire pressure warning antenna and receiver signal	Ignition switch on (IG)	11 to 14 V

3. Connect the O11 tire pressure warning antenna and receiver connector.
4. Measure the voltage and resistance according to the value (s) in the table below. If the result is not as specified, the ECU may have a malfunction.
   CONNECTOR TERMINAL REFERENCE
   
   

   Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
   D33-1 (CLSW) - D33-9 (GND)	P - W-B	Tire pressure warning reset switch	Ignition switch on (IG) Tire pressure warning reset switch on	8.5 to 15 V
   			Ignition switch on (IG) Tire pressure warning reset switch OFF	Below 1.5 V
   D33-2 (SPD) - D33-9 (GND)	L - W-B	Vehicle speed signal	Vehicle is running	Pulse generation (see waveform 1  e)
   D33-3 (TC) - D33-9 (GND)	BR - W-B	TC terminal	Terminal TC is not connected	11 to 14 V
   D33-4 (TACH) - D33-9 (GND)	V - W-B	Engine speed signal	Engine is running	Pulse generation (see waveform 2  f)
   D33-5 (IND) - D33-9 (GND)	SB - W-B	Tire pressure warning light output signal	Ignition switch on (IG) Tire pressure warning light off	Below 0.5 V
   		Tire pressure warning reset switch	After ignition switch is turned on (IG), tire pressure warning light illuminates for 3 seconds.	0.9 to 3.2 V
   D33-6 (RF5V) - D33-9 (GND)	LG - W-B	Tire pressure warning antenna and receiver power source	Ignition switch on (IG)	4.5 to 5.5 V
   D33-7 (IG) - D33-9 (GND)	B - W-B	IG power source	Ignition switch on (IG)	11 to 14 V
   D33-9 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
   D33-10 (SIL) - D33-9 (GND)	O - W-B	Diagnostic communication	Ignition switch on (IG)	8 to 14 V
   D33-11 (GND2) - D33-9 (GND)	W - W-B	Tire pressure warning antenna and receiver ground	Always	Below 1 Ω

5. Using an oscilloscope, check waveform 1.

   Waveform 1: 

   WAVEFORM REFERENCE
   
   

   Item	Contents
   Terminal	D33-2 (SPD) - D33-9 (GND)
   Tool setting	5V/DIV., 20ms./DIV.
   Vehicle condition	While driving at approximately 12 mph (20 km/h)

   Fig 2: Waveform Graph 1

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Using an oscilloscope, check waveform 2.

Waveform 2: 

HINT:

The wavelength becomes shorter as the engine speed increases.

Fig 3: Waveform Graph 2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002