Toyota 4Runner manuals

Toyota 4Runner: Speed Signal Circuit

DESCRIPTION

The vehicle speed signal consists of pulses sent to the combination meter assembly from the master cylinder solenoid (skid control ECU)*1 or skid control ECU (brake actuator assembly)*2.

  • *1: for 4WD
  • *2: for 2WD

WIRING DIAGRAM



PROCEDURE

1.

CHECK ECU TERMINAL VOLTAGE (INPUT VOLTAGE)

(a) Disconnect the F14 combination meter assembly connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F14-28 (+S) - Body ground

Ignition switch ON

4.5 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Combination Meter Assembly)



NG

GO TO STEP 5


OK

2.

CHECK COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)

(a) for 4WD:

(1) Disconnect the A6 master cylinder solenoid (skid control ECU) connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A6-12 (SP1) - Body ground

Ignition switch ON

11 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Master Cylinder Solenoid (Skid Control ECU))


(b) for 2WD:

(1) Disconnect the A53 skid control ECU (brake actuator assembly) connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A53-11 (SP1) - Body ground

Ignition switch ON

11 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))



NG

GO TO STEP 4


OK

3.

CHECK COMBINATION METER ASSEMBLY (SPEED SIGNAL)

(a) Check the input waveform.

(1) Reconnect the F14 combination meter assembly connector.

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

(3) Connect an oscilloscope to terminal F14-29 (SI) and body ground.

(4) Turn the ignition switch to ON.

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

Measurement Condition

Item

Condition

Terminal No. (Symbol)

F14-29 (SI) - Body ground

Tool setting

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

Condition

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

OK:

The waveform displayed is 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.


Result

Result

Proceed to

OK

A

NG (for 4WD)

B

NG (for 2WD)

C


A

REPLACE COMBINATION METER ASSEMBLY


B

REPLACE MASTER CYLINDER SOLENOID (SKID CONTROL ECU)


C

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

4.

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

(a) Disconnect the F14 combination meter assembly connector.

(b) Disconnect the A6 master cylinder solenoid (skid control ECU )*1 or A53 skid control ECU (brake actuator assembly)*2 connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F14-29 (SI) - A6-12 (SP1)*1

F14-29 (SI) - A53-11 (SP1)*2

Always

Below 1 Ω

A6-12 (SP1) - Body ground*1

A53-11 (SP1) - Body ground*2

Always

10 kΩ or higher

  • *1: for 4WD
  • *2: for 2WD

OK

REPLACE COMBINATION METER ASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - NO. 4 JUNCTION BLOCK)

(a) Disconnect the F14 combination meter assembly connector.

(b) Disconnect the 4B No. 4 junction block connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F14-28 (+S) - 4B-20

Always

Below 1 Ω

F14-28 (+S) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

6.

CHECK HARNESS AND CONNECTOR (NO. 4 JUNCTION BLOCK)

(a) Inspect for a short in the circuit that is connected to the junction block 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 4A No. 4 junction block connector.

Text in Illustration

*1

No. 4 Junction Block

-

-

*a

Front view of wire harness connector

(to No. 4 Junction Block)

-

-

(2) Disconnect the 4C No. 4 junction block connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

4C-16 - Body ground

Ignition switch ON

4.5 to 14 V

4B-8 - Body ground

Ignition switch ON

4.5 to 14 V

4A-90 - Body ground

Ignition switch ON

4.5 to 14 V

Result

Result

Proceed to

Voltage is not present in one circuit

A

Voltage is present in all the circuits

B


B

REPLACE NO. 4 JUNCTION BLOCK


A

7.

SYSTEM CHECK

(a) Select the circuit for which voltage was not present in the previous step.

Result

Tester Connection

System that Uses the Circuit

Proceed to

4C-16 - Body ground

SFI system, smart key system*1, safety connect system*2, voltage inverter*1, intuitive parking assist system*3

A

4B-8 - Body ground

Tire pressure warning system

B

4A-90 - Body ground

Audio and visual system or navigation system

C

  • *1: w/ Smart Key System
  • *2: w/ Safety Connect System
  • *3: w/ Intuitive Parking Assist System

B

GO TO STEP 16


C

GO TO STEP 17


A

8.

CHECK HARNESS AND CONNECTOR (NO. 4 JUNCTION BLOCK - NO. 5 JUNCTION BLOCK)

(a) Disconnect the 4C No. 4 junction block connector.

(b) Disconnect the 5B No. 5 junction block connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4C-16 - 5B-25

Always

Below 1 Ω

4C-16 - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

9.

CHECK HARNESS AND CONNECTOR (NO. 5 JUNCTION BLOCK)

(a) Disconnect the 5A No. 5 junction block connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

5B-2 - 5A-13

Always

Below 1 Ω

5B-2 - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

10.

CHECK HARNESS AND CONNECTOR (NO. 5 JUNCTION BLOCK)

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

(1) Disconnect the 5C No. 5 junction block connector.

Text in Illustration

*1

No. 5 Junction Block

-

-

*a

Front view of wire harness connector

(to No. 5 Junction Block)

-

-

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

5B-14 - Body ground

Ignition switch ON

4.5 to 14 V

5C-1 - Body ground*1

Ignition switch ON

4.5 to 14 V

5A-1 - Body ground*1

Ignition switch ON

4.5 to 14 V

5A-38 - Body ground*2

Ignition switch ON

4.5 to 14 V

5A-73 - Body ground*3

Ignition switch ON

4.5 to 14 V

  • *1: w/ Smart Key System
  • *2: w/ Safety Connect System
  • *3: w/ Intuitive Parking Assist System
Result

Result

Proceed to

Voltage is not present in one circuit

A

Voltage is present in all the circuits

B


B

REPLACE NO. 5 JUNCTION BLOCK


A

11.

SYSTEM CHECK

(a) Select the circuit for which voltage was not present in the previous step.

Result

Tester Connection

System that Uses the Circuit

Proceed to

5B-14 - Body ground

SFI system

A

5C-1 - Body ground*1

Voltage inverter

B

5A-1 - Body ground*1

Smart key system

C

5A-38 - Body ground*2

Safety connect system

D

5A-73 - Body ground*3

Intuitive Parking Assist System

E

  • *1: w/ Smart Key System
  • *2: w/ Safety Connect System
  • *3: w/ Intuitive Parking Assist System

B

GO TO STEP 13


C

GO TO STEP 14


D

GO TO STEP 15


E

GO TO STEP 20


A

12.

CHECK HARNESS AND CONNECTOR (ECM CIRCUIT)

(a) Disconnect the F51 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F51-18 (SPD) - Body ground

Always

10 kΩ or higher


OK

REPLACE ECM


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.

CHECK HARNESS AND CONNECTOR (VOLTAGE INVERTER ASSEMBLY CIRCUIT)

(a) Disconnect the N19 voltage inverter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

N19-2 (SPD) - Body ground

Always

10 kΩ or higher


OK

REPLACE VOLTAGE INVERTER ASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.

CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU CIRCUIT)

(a) Disconnect the F80 power management control ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F80-23 (SPD) - Body ground

Always

10 kΩ or higher


OK

REPLACE POWER MANAGEMENT CONTROL ECU


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

15.

CHECK HARNESS AND CONNECTOR (TELEMATICS TRANSCEIVER CIRCUIT)

(a) Disconnect the F39 telematics transceiver connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F39-10 (SPDP) - Body ground

Always

10 kΩ or higher


OK

REPLACE TELEMATICS TRANSCEIVER


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

16.

CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU CIRCUIT)

(a) Disconnect the F7 tire pressure warning ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F7-2 (SPD) - Body ground

Always

10 kΩ or higher


OK

REPLACE TIRE PRESSURE WARNING ECU


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

17.

SYSTEM CHECK

(a) Proceed to the appropriate inspection based on the components of the vehicle.

Component

Component

Proceed to

for Navigation Receiver Type

A

for Radio and Display Type

B

for 9 Speakers Type

C


B

GO TO STEP 19


C

GO TO STEP 21


A

18.

CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER CIRCUIT)

(a) Disconnect the G37 navigation receiver connector.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

G37-17 (SPD) - Body ground

Always

10 kΩ or higher


OK

REPLACE NAVIGATION RECEIVER ASSEMBLY


NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

19.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER CIRCUIT)

(a) Disconnect the G49 radio and display receiver connector.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

G49-17 (SPD) - Body ground

Always

10 kΩ or higher


OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

20.

CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU CIRCUIT)

(a) Disconnect the F95 clearance warning ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F95-5 (SPD) - Body ground

Always

10 kΩ or higher


OK

REPLACE CLEARANCE WARNING ECU ASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

21.

CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY)

(a) Disconnect the N11 stereo component amplifier connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

N11-11 (SPD) - Body ground

Always

10 kΩ or higher


OK

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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