Toyota Venza: Diagnosis System

Toyota Venza Service Manual / Tire Pressure Monitoring / Tire Pressure Warning System / Diagnosis System

DIAGNOSIS SYSTEM

1. CHECK BATTERY VOLTAGE

Standard voltage:

11 to 14 V

If the voltage is below 11 V, recharge the battery before proceeding to the next step.

2. CHECK DLC3

(a) The ECU uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.

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	Ignition switch off*	54 to 69 Ω
CANH (6) - CG (4)	HIGH-level CAN bus line	Ignition switch off*	200 Ω or higher
CANL (14) - CG (4)	LOW-level CAN bus line	Ignition switch off*	200 Ω or higher
CANH (6) - BAT (16)	HIGH-level CAN bus line	Ignition switch off*	6 kΩ or higher
CANL (14) - BAT (16)	LOW-level CAN bus line	Ignition switch off*	6 kΩ or higher

NOTICE:

*: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch or any other switches or the doors.

(b) 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 ignition 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 manual.

3. DIAGNOSIS SYSTEM

(a) Warning light

(1) When there is a problem with the tire pressure warning system, the tire pressure warning light blinks at 0.5 second intervals and comes on after 1 minute.

NOTICE:

When the malfunction has been corrected, the tire pressure warning light does not come on.

(b) DTCs (Normal mode)

(1) DTCs are memorized in the tire pressure warning ECU and read by the blinks of the tire pressure warning light or by using the Techstream (See page ).

(1) By switching from normal mode into test mode (input signal check), you can inspect the tire pressure warning antenna and receiver, each tire pressure warning valve and transmitter, engine speed signal and vehicle speed sensor (See page ).

4. CHECK TIRE PRESSURE WARNING LIGHT

(a) Turn the ignition switch to ON.

(b) Check that the tire pressure warning light comes on for 3 seconds.

If the warning check result is not normal, proceed to the troubleshooting for the tire pressure warning light circuit (See page ).

5. TIRE PRESSURE WARNING LIGHT CHART

HINT:

The table below indicates the tire pressure warning system status according to the tire pressure warning light after the ignition switch is turned to ON.

System Status	Immediately after turning the ignition switch to ON	Always
	Immediately after turning the ignition switch to ON	Warning light output pattern
	Comes on for 3 sec.	Goes off	Comes on	Blinks for 1 minute and then illuminates*1	Blinks*2	Blinks*3	Outputs DTC
Normal	○	○	-	-	-	-	-
Low tire pressure	○	-	○	-	-	-	-
System fail	○	-	-	○	-	-	-
Test mode	○	-	-	-	○	-	-
ECU connector poorly connected	-	-	-	○*4	-	-	-
TC ground (DTC is output)	○	-	-	-	-	-	○
TC ground (DTC is not output)	○	-	-	-	-	○	-

*1: Comes on and goes off repeatedly at 0.5 second intervals, and stays on after 1 minute.

*2: Comes on and goes off repeatedly at 0.125 second intervals.

*3: Comes on and goes off repeatedly at 0.25 second intervals.

*4: If it is determined that there is a short circuit, the light will remain off for 10 seconds. It will then blink at 0.5 second intervals and stay on after 1 minute.

Test Mode Procedure

TEST MODE PROCEDURE 1. ENTER TEST MODE (SIGNAL CHECK MODE) (a) Turn the ignition switch off. (b) Connect the Techstream to the DLC3. (c) Turn the ignition switch to ON. (d) Check that the tire pr ...

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TERMINALS OF ECU 1. CHECK TIRE PRESSURE WARNING ECU HINT: Inspect the connectors from the back side while the connectors are connected. (a) Disconnect the L14 tire pressure warning antenna and r ...

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