Yamaha Tracer MT09TRA - Service manual > Checking the throttle servo motor

1. Remove:

• Air filter case.

  Refer to "GENERAL CHASSIS (1)"

2. Check:

• Throttle valve operation

Throttle valves do not fully close → Replace the throttle bodies.

a. Connect two C-size batteries to the throttle servo motor terminals "1" as shown.

NOTICE

• Do not use a 12 V battery to operate the throttle servo motor.

TIP

Do not use old batteries to operate the throttle servo motor.

A. Check that the throttle valves "2" open.

B. Check that the throttle valves "2" fully close.

Checking the air induction system solenoid

1. Check:

• Air induction system solenoid resistance Out of specification → Replace

Solenoid resistance 20-24

a. Remove the air induction system solenoid coupler from the air induction system solenoid.

b. Connect the pocket tester (* 1) to the air induction system solenoid terminal as shown.

Pocket tester 90890-03112

Analog pocket tester YU-03112-C

• Positive tester probe → Air induction system solenoid terminal "1"
•  Negative tester probe → Air induction system solenoid terminal "2"

c. Measure the air induction system solenoid resistance.

Checking the intake air pressure sensor

1. Check:

• Intake air pressure sensor output voltage Out of specification → Replace.

Intake air pressure sensor output voltage 3.57-3.71 V101.3 kPa (3.57- 3.71 V1.01 kgf/cm², 3.57-3.71 V14.7 psi)

a. Connect the test harness S- pressure sensor (3P) "1" to the intake air pressure sensor and wire harness as shown.

NOTICE

Pay attention to the installing direction of the test harness S- pressure sensor (3P) coupler.

b. Connect the digital circuit tester (DCV) to the test harness S- pressure sensor (3P).

Digital circuit tester 90890-03174

Model 88 Multimeter with tachometer YU-A1927

Test harness S- pressure sensor (3P) 90890-03207

Test harness S- pressure sensor (3P) YU-03207

• Positive tester probe pink (wire harness color) (intake air pressure sensor 1) pink/white (wire harness color) (intake air pressure sensor 2)
• Negative tester probe black/blue (wire harness color)

A. Intake air pressure sensor 1

B. Intake air pressure sensor 2

c. Set the main switch to "ON".

d. Measure the intake air pressure sensor output voltage.

Checking the intake air temperature sensor

1. Remove:

• Intake air temperature sensor

WARNING

• Handle the intake air temperature sensor with special care.
• Never subject the intake air temperature sensor to strong shocks. If the intake air temperature sensor is dropped, replace it.

2. Check:

• Intake air temperature sensor resistance

Out of specification → Replac

Intake air temperature sensor resistance 5400-6600 @0 ºC (32 ºF)

Intake air temperature sensor resistance 290-390 @80 ºC (176 ºF)

a. Connect the pocket tester (* 100) to the intake air temperature sensor terminal as shown.

Pocket tester 90890-03112

Analog pocket tester YU-03112-C

b. Immerse the intake air temperature sensor "1" in a container filled with water "2".

TIP

Make sure that the intake air temperature sensor terminals do not get wet.

c. Place a thermometer "3" in the water.

d. Slowly heat the water, then let it cool down to the specified temperature.

e. Measure the intake air temperature sensor resistance.

3. Install:

• Intake air temperature sensor

See also: