Toyota Sienna Service Manual: Speed Signal Circuit
DESCRIPTION
The clearance warning ECU receives the vehicle speed signal from the combination meter.
HINT:
- A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter. The signal is changed to a pulse signal at the transistor in the combination meter. Each ECU controls the respective system based on the pulse signal.
- If a short occurs in an ECU, all systems in the diagram below will not operate normally.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK OPERATION OF SPEEDOMETER
- Drive the vehicle and check if the function of the speedometer in the combination meter is normal.
OK: Actual vehicle speed and the speed indicated on the speedometer are the same.
HINT: The vehicle speed signal is normal when the indication on the speedometer is normal.
2 INSPECT CLEARANCE WARNING ECU
- Disconnect the clearance warning ECU connector C9.
- Measure the voltage.
- Jack up either one of the drive wheels.
- Move the shift lever to the neutral position.
- Turn the ignition switch to the ON position
- Measure the voltage between terminal SPD of the clearance warning ECU and body ground when a drive wheel is turned slowly.
OK: Voltage pulses as shown.
3 CHECK HARNESS AND CONNECTOR (COMBINATION METER - CLEARANCE WARNING ECU)
- Disconnect the combination meter C10 connector.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
4 CHECK HARNESS AND CONNECTOR (COMBINATION METER AND EACH ECU - BODY GROUND)
- Measure the resistance according to the value(s) in the table below.
Standard resistance
HINT: If the resistance between terminal SPD and body ground is less than 10 kΩ, there may be a short in a wire harness, connector, or ECU.
REPLACE COMBINATION METER
Park / Neutral Position Switch Circuit
DESCRIPTION
The clearance warning ECU receives the reverse or park position signal from
the park / neutral position
switch.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT CLEARANCE WARNING E ...
Back Sonar Sensor LH Circuit
DESCRIPTION
An ultrasonic sensor consists of a sensor portion that transmits and receives
ultrasonic waves and a preamplifier
that amplifies them. The ultrasonic sensor outputs the ultrasonic wave ...
Other materials:
Folding down the third seats (manual seats)
Before folding the third seats
Fold the outside head
restraints and lower the center
head restraint to the lowest
position , and
stow the seat belt buckles.
Stow the center seat belt.
Folding down the third seatbacks
Pull the “TO FOLD/LIFT SEATBACK”
strap a
Return ...
Cooling fan motor
On-vehicle inspection
1. No. 1 Cooling fan motor
(A) check that the motor turns smoothly when the
battery is connected to the fan motor connector.
(B) measure the current while the motor is turning.
Standard current:
11.8 To 14.8 A at 20°c (68°f)
if the result is not as specified, r ...
Data list / active test
1. DATA LIST
The wireless door lock control data list can be
displayed while the intelligent tester is connected to
the DLC3 with the ignition switch in the ON position.
Follow the prompts on the tester screen to access
the DATA LIST.
BODY:
2. ACTIVE TEST
HINT:
Performing the ACT ...
