Toyota Venza: Vehicle Speed Signal Error (Test Mode DTC) (C2191/91)

Toyota Venza Service Manual / Tire Pressure Monitoring / Tire Pressure Warning System / Vehicle Speed Signal Error (Test Mode DTC) (C2191/91)

DESCRIPTION

The tire pressure warning ECU receives a vehicle speed signal from the combination meter. This DTC is stored upon entering signal check mode (test mode), and cleared when a vehicle speed signal of 20 km/h (12 mph) is detected for 3 seconds or more. This DTC is output only in signal check mode.

DTC No.	DTC Detection Condition	Trouble Area
C2191/91	Test mode procedure is performed	Combination meter Vehicle speed sensor Wire harness or connector Tire pressure warning ECU

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU using the Techstream and write them down before removal.
It is necessary to perform registration (See page ) of the transmitter IDs into the tire
pressure warning ECU if the ECU has been replaced.

PROCEDURE

1.	READ VALUE USING TECHSTREAM (VEHICLE SPEED)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(f) Check that the values indicated on the Techstream and on the combination meter are the same.

Tire Pressure Monitor

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Vehicle Speed	Vehicle speed/ min.: 0 km/h (0 mph) max.: 255 km/h (158 mph)	Almost same as actual vehicle speed	Speed indicated on combination meter

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Vehicle Speed

Vehicle speed/

min.: 0 km/h (0 mph)

max.: 255 km/h (158 mph)

Almost same as actual vehicle speed

Speed indicated on combination meter

OK:

Vehicle speed indicated on the Techstream and on the combination meter are the same.

USE SIMULATION METHOD TO CHECK

2.	INSPECT TIRE PRESSURE WARNING ECU (SPD SIGNAL)

(a) Disconnect the D31 ECU connector.

(b) Jack up the vehicle.

(d) Turn the ignition switch to ON.

(e) Check the waveform of the ECU connector using an oscilloscope while turning the wheel slowly.

OK:

Tester Connection	Switch Condition	Specified Condition
D31-2 (SPD) - D31-9 (GND)	Ignition switch ON	Correct waveform appears as shown

Text in Illustration

*1	Rear view of wire harness connector (to Tire Pressure Warning ECU)

Tool Setting

Item	Contents
Tool Setting	5 V/DIV., 20 ms/DIV.
Vehicle Condition	Driving wheels rotating slowly

HINT:

The wavelength becomes shorter as the vehicle speed increases.

REPLACE TIRE PRESSURE WARNING ECU

3.	CHECK HARNESS AND CONNECTOR (ECU - COMBINATION METER)

(a) Disconnect the D31 ECU connector.

(b) Disconnect the E1 meter connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D31-2 (SPD) - E1-16 (+S)	Always	Below 1 Ω
D31-2 (SPD) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Tire Pressure Warning ECU)

Front view of wire harness connector

(to Combination Meter)

REPLACE COMBINATION METER

REPAIR OR REPLACE HARNESS OR CONNECTOR

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