Toyota Venza manuals

Toyota Venza: Engine Speed Signal Error (Test Mode DTC) (C2194/94)

Toyota Venza Service Manual / Tire Pressure Monitoring / Tire Pressure Warning System / Engine Speed Signal Error (Test Mode DTC) (C2194/94)

DESCRIPTION

The tire pressure warning ECU receives an engine speed signal from the ECM. This DTC is stored upon entering signal check mode (test mode), and cleared when an engine speed signal of 1000 rpm is detected for 3 seconds or more. This DTC is output only in signal check mode.

DTC No.

DTC Detection Condition

Trouble Area

C2194/94

Test mode procedure is performed

  • ECM
  • 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 (ENGINE SPEED)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(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

Engine Speed

Engine speed/

min.: 0 rpm

max.: 65535 rpm

Almost same as actual engine speed

Speed indicated on combination meter

OK:

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


OK

USE SIMULATION METHOD TO CHECK


NG

2.

INSPECT TIRE PRESSURE WARNING ECU (TACH SIGNAL)

(a) Disconnect the D31 ECU connector.


(b) Start the engine.

(c) Check the waveform of the ECU connector using an oscilloscope while idling the engine.

OK:

Tester Connection

Condition

Specified Condition

D31-4 (TACH) - D31-9 (GND)

Idling

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., 10 ms/DIV.

HINT:

The wavelength becomes shorter as the engine speed increases.


OK

REPLACE TIRE PRESSURE WARNING ECU


NG

3.

CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU - ECM)

(a) Disconnect the D31 ECU connector.


(b) Disconnect the A41 or A49 ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

D31-4 (TACH) - A41-15 (TACH)

Always

Below 1 Ω

D31-4 (TACH) - A49-26 (TACH)

Always

Below 1 Ω

D31-4 (TACH) - Body ground

Always

10 kΩ or higher

Text in Illustration

*1

Front view of wire harness connector

(to Tire Pressure Warning ECU)

*2

Front view of wire harness connector

(to ECM)

*3

2GR-FE

*4

1AR-FE

Result

Proceed to

OK (for 2GR-FE)

A

OK (for 1AR-FE)

B

NG

C


A

REPLACE ECM (for 2GR-FE)


B

REPLACE ECM (for 1AR-FE)


C

REPAIR OR REPLACE HARNESS OR CONNECTOR

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