Toyota Venza manuals

Toyota Venza: Speed Signal Circuit

DESCRIPTION

The combination meter assembly receives the vehicle speed signal from this circuit. The wheel speed sensors produce an output that varies according to the vehicle speed. The wheel speed sensor output is received by the skid control ECU which uses this information to create the vehicle speed sensor signal*1. The vehicle speed sensor signal consists of pulses sent to the combination meter assembly from the skid control ECU. To create this signal, 12 V is output from IG2 which is behind a resistor in the combination meter assembly. This voltage is sent to the skid control ECU. The pulse signal is created by switching the transistor in the skid control ECU on and off, making the voltage on the wire drop to 0 V. A similar system is used for the output of this signal from the combination meter assembly via terminal +S. A voltage of 12 V or 5 V is applied to terminal +S from each ECU or relay that is connected to this terminal. The transistor in the combination meter assembly is controlled by the signal from the skid control ECU. When this transistor is turned on, this transistor makes the voltage supplied by the various ECUs (via their respective internal resistors) drop to 0 V. Each ECU connected to terminal +S of the combination meter assembly controls its respective system based on the pulse signal.

  • *1: This vehicle speed sensor signal is created by the skid control ECU. There is no actual component that is referred to as the vehicle speed sensor. In addition, for some other systems, vehicle speed information may be exchanged using CAN communication.

HINT:

This circuit is used for the systems connected to terminal +S. This signal is not used for combination meter assembly operation. Combination meter assembly components such as the speedometer operate using data received via CAN communication.

WIRING DIAGRAM

1. for 2GR-FE


2. for 1AR-FE


PROCEDURE

1.

INSPECT ECU TERMINAL VOLTAGE (INPUT VOLTAGE)

(a) Disconnect the E1 connector.


(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

E1-16 (+S) - Body ground

Ignition switch ON

4.5 to 14 V

Text in Illustration

*1

Front view of wire harness connector

(to Combination Meter Assembly)

HINT:

If any of the ECUs specified in the wiring diagram supplies power to the combination meter assembly, the combination meter assembly will output a waveform.


NG

GO TO STEP 5


OK

2.

INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)

(a) Reconnect the E1 connector.

(b) Disconnect the A42 connector.


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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A42-33 (SP1) - Body ground

Ignition switch ON

11 to 14 V

Text in Illustration

*1

Front view of wire harness connector

(to Skid Control ECU)


NG

GO TO STEP 4


OK

3.

INSPECT SKID CONTROL ECU (INPUT WAVEFORM)

(a) Check the input waveform.

(1) Reconnect the A42 connector.

(2) Remove the combination meter assembly with the connector(s) still connected.

(3) Connect an oscilloscope to terminal E1-8 (SI) and body ground.

(4) Turn the ignition switch ON.

(5) Turn the wheel slowly.

(6) Check the signal waveform according to the condition(s) in the table below.

Item

Condition

Tool setting

5 V/DIV., 20 ms./DIV.

Vehicle condition

Driving at approx. 20 km/h (12 mph)

Text in Illustration

*1

Component with harness connected

(Combination Meter Assembly)

OK:

The waveform is displayed as shown in the illustration.

HINT:

When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.



OK

REPLACE COMBINATION METER ASSEMBLY


NG

REPLACE SKID CONTROL ECU

4.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - SKID CONTROL ECU)

(a) Disconnect the E1 and A42 connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A42-33 (SP1) - E1-8 (SI)

Always

Below 1 Ω

A42-33 (SP1) - Body ground

Always

10 kΩ or higher


OK

REPLACE COMBINATION METER ASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - JUNCTION CONNECTOR)

(a) Disconnect the E31 junction connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

E1-16 (+S) - E31-19

Always

Below 1 Ω

E1-16 (+S) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

6.

CHECK JUNCTION CONNECTOR

(a) Check for a short in the circuit that is connected to the junction connector shown in the wiring diagram.

HINT:

If voltage is not present, it is possible that an ECU or circuit has a malfunction. The malfunctioning ECU or circuit will be diagnosed in the following steps.

(1) Disconnect the D57 junction connector.


(2) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

E31-20 - Body ground

Ignition switch ON

4.5 to 14 V

E31-21 - Body ground

Ignition switch ON

4.5 to 14 V

D57-13 - Body ground

Ignition switch ON

4.5 to 14 V

D57-14 - Body ground

Ignition switch ON

4.5 to 14 V

D57-15 - Body ground

Ignition switch ON

4.5 to 14 V

Text in Illustration

*1

Front view of wire harness connector

(to Junction Connector)

Result

Proceed to

Voltage is not present in one circuit.

A

Voltage is present in all the circuits.

B


B

REPLACE JUNCTION CONNECTOR


A

7.

CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR - JUNCTION CONNECTOR)

(a) Disconnect the D55 junction connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D57-14 - D55-17

Always

Below 1 Ω

D57-14 - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

8.

CHECK JUNCTION CONNECTOR

(a) Check for a short in the circuit that is connected to A43 junction connector shown in the wiring diagram.

HINT:

If voltage is not present, it is possible that an ECU or circuit has a malfunction. The malfunctioning ECU or circuit will be diagnosed in the following steps.

(1) Disconnect the A43 junction connector.


(2) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A43-16 - Body ground

Ignition switch ON

4.5 to 14 V

A43-17 - Body ground

Ignition switch ON

4.5 to 14 V

A43-18 - Body ground

Ignition switch ON

4.5 to 14 V

Text in Illustration

*1

Front view of wire harness connector

(to Junction Connector)

Result

Proceed to

Voltage is not present in one circuit.

A

Voltage is present in all the circuits.

B


B

REPLACE JUNCTION CONNECTOR


A

9.

SYSTEM CHECK

(a) Select the circuit in which voltage is not present in step 6.

Tester Connection

System that Uses the Circuit

Proceed to

D57-15 - Body ground

Tire Pressure Warning System

A

D57-13 - Body ground

Smart Key System*1

B

E31-21 - Body ground

Audio and Visual System*2

C

E31-20 - Body ground

Audio and Visual System or Navigation System

D

D57-14 - Body ground

SFI System, Automatic Transaxle System or Lighting System*3

E

  • *1: w/ Smart Key System
  • *2: for 13 Speakers
  • *3: w/ Automatic Type Headlight Beam Level Control

B

GO TO STEP 11


C

GO TO STEP 12


D

GO TO STEP 13


E

GO TO STEP 14


A

10.

CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU CIRCUIT)

(a) Disconnect the D31 connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D31-2 (SPD) - Body ground

Always

10 kΩ or higher


OK

REPLACE TIRE PRESSURE WARNING ECU


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.

CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU CIRCUIT)

(a) Disconnect the D43 connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D43-23 (SUT) - Body ground

Always

10 kΩ or higher


OK

REPLACE POWER MANAGEMENT CONTROL ECU


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.

CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER CIRCUIT)

(a) Disconnect the E14 connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

E14-11 (SPD) - Body ground

Always

10 kΩ or higher


OK

REPLACE STEREO COMPONENT AMPLIFIER


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY CIRCUIT, NAVIGATION RECEIVER ASSEMBLY CIRCUIT)

(a) Disconnect the E42*1 or E40*2 connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

E42-17 (SPD)*1 - Body ground

Always

10 kΩ or higher

E40-17 (SPD)*2- Body ground

Always

10 kΩ or higher

  • *1: w/o Navigation System
  • *2: w/ Navigation System

Result

Proceed to

OK (w/o Navigation System)

A

OK (w/ Navigation System)

B

NG

C


A

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY


B

REPLACE NAVIGATION RECEIVER ASSEMBLY


C

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.

SYSTEM CHECK

(a) Select the circuit in which is not present voltage in step 8.

Tester Connection

System that Uses the Circuit

Proceed to

A43-17 - Body ground

SFI System

A

A43-16 - Body ground

Automatic Transaxle System

B

A43-18 - Body ground

Lighting System*1

C

  • *1: w/ Automatic Type Headlight Beam Level Control

B

GO TO STEP 16


C

GO TO STEP 17


A

15.

CHECK HARNESS AND CONNECTOR (ECM CIRCUIT)

(a) Disconnect the A41*1 or A49*2 connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A41-13 (SPD)*1 - Body ground

Always

10 kΩ or higher

A49-15 (SPD)*2 - Body ground

Always

10 kΩ or higher

  • *1: for 2GR-FE
  • *2: for 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

16.

CHECK HARNESS AND CONNECTOR (TCM CIRCUIT)

(a) Disconnect the B40 connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B40-3 (SPD) - Body ground

Always

10 kΩ or higher

Result

Proceed to

OK (for U660E Automatic Transaxle System)

A

OK (for U660F Automatic Transaxle System)

B

OK (for U760E Automatic Transaxle System)

C

OK (for U760F Automatic Transaxle System)

D

NG

E


A

REPLACE TCM (for U660E)


B

REPLACE TCM (for U660F)


C

REPLACE TCM (for U760E)


D

REPLACE TCM (for U760F)


E

REPAIR OR REPLACE HARNESS OR CONNECTOR

17.

CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY CIRCUIT)

(a) Disconnect the A40 connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A40-16 (SPDR) - Body ground

Always

10 kΩ or higher


OK

REPLACE HEADLIGHT LEVELING ECU ASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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