Diagnosis System

Battery voltage: 11 to 14 V 

If the voltage is below 11 V, recharge the battery before proceeding

1. The tire pressure warning ECU and receiver uses ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format
   Fig 1: Identifying DLC3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   DLC3 CONNECTOR TERMINALS REFERENCE
   
   

   Symbol (Terminal No.)	Terminal Description	Condition	Specified Condition
   SIL (7) - SG (5)	Bus "+" line	During transmission	Pulse generation
   CG (4) - Body ground	Chassis ground	Always	Below 1 Ω
   SG (5) - Body ground	Signal ground	Always	Below 1 Ω
   BAT (16) - Body ground	Battery positive	Always	11 to 14 V
   CANH (6) - CANL (14)	CAN bus line	Engine switch off(1)	54 to 69 Ω
   CANH (6) - CG (4)	HIGH-level CAN bus line	Engine switch off(1)	200 Ω or higher
   CANL (14) - CG (4)	LOW-level CAN bus line	Engine switch off(1)	200 Ω or higher
   CANH (6) - BAT (16)	HIGH-level CAN bus line	Engine switch off(1)	6 kΩ or higher
   CANL (14) - BAT (16)	LOW-level CAN bus line	Engine switch off(1)	6 kΩ or higher
   (1) Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine switch or any other switches or the doors.

2. If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector

   HINT

   Connect the Techstream cable to the DLC3, turn the engine switch on (IG) and attempt to use the Techstream If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the Techstream

   • If communication is normal when the Techstream is connected to another vehicle, inspect the DLC3 of the original vehicle.
   • If communication is still not possible when the Techstream is connected to another vehicle, the problem may be in the Techstream itself Consult the Service Department listed in the Techstream instruction service information

1. Warning light and indicator
   1. When there is a problem with the tire pressure warning system, "CHECK SYSTEM" is displayed on the multi-display, the master warning light comes on and the tire pressure warning light blinks at 0.5 second intervals and comes on after 1 minute
      NOTE: When the malfunction has been corrected, the tire pressure warning light does not come on and "CHECK SYSTEM" does not display.
   Fig 2: Identifying Warning Light And Indicator - CHECK SYSTEM
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. DTCs (Normal mode)
   1. DTCs are memorized in the tire pressure warning ECU and receiver and read by the blinks of the tire pressure warning light or by using the Techstream (See DTC CHECK/CLEAR  )
3. Test mode
   1. By switching from the normal mode into test mode (input signal check), you can inspect the tire pressure warning ECU and receiver, each tire pressure warning valve and transmitter, engine speed signal, tire pressure warning select switch signal and vehicle speed sensor (See TEST MODE PROCEDURE  )

1. Turn the engine switch on (IG)
2. Check that the tire pressure warning light comes on for 3 seconds

   If the warning light check result is not normal, proceed to the troubleshooting for the TIRE PRESSURE WARNING LIGHT CIRCUIT 

   TROUBLE AREA REFERENCE CHART
   
   

   Trouble Area	See Procedure
   Tire pressure warning light circuit	TIRE PRESSURE WARNING LIGHT CIRCUIT

Fig 3: Identifying Tire Pressure Warning Light
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT

The table below indicates the state of the tire pressure warning light, master warning light and warning message after the engine switch is turned on (IG)

	Immediately after Turning the Engine Switch on (IG)	Always
		Warning Light Output Pattern					Master Warning Light Output Pattern	Warning Message Output Pattern
	Comes on for 3 sec.	Goes off	Comes on	Blinks*1	Blinks*2	Bhnks*3		Displayed on Multi-information Display
Normal	◦	◦	-	-	-	-	◦*6	-
Low tire pressure	◦	-	◦	-	-	-	◦	LOW TIRE
System malfunction	◦	-	-	◦	-	-	◦	CHECK SYSTEM
Test mode	◦	-	-	-	◦	-	-	TEST MODE
Initialization	◦	-	-	-	-	◦	◦	PRESSURE INITIALM
ECU connector poorly connected	-	-	-	◦	-	-	◦	CHECK SYSTEM
TC ground	◦	-	-	-	-	-	-	DIAG TIRE OK*5
*1: Comes on and goes off repeatedly at 0.5 second intervals. HINT. The tire pressure warning light blinks for approximately 1 minute and then remains on. Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002© TOYOTA, LICENSE AGREEMENT TMS1002© TOYOTA, LICENSE AGREEMENT TMS1002 *2. Comes on and goes off repeatedly at 0 125 second intervals Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002© TOYOTA, LICENSE AGREEMENT TMS1002© TOYOTA, LICENSE AGREEMENT TMS1002 *3. Blinks 3 times (1 second on, 1 second off). *4. This message is displayed only when the engine is on *5: When there is no DTC, "OK" is displayed, when there is a DTC, the DTC is displayed *6. Comes on for 3 seconds after turning the engine switch on (IG) Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002© TOYOTA, LICENSE AGREEMENT TMS1002© TOYOTA, LICENSE AGREEMENT TMS1002