Toyota Sienna Service Manual: Turbine Speed Sensor Circuit No Signal
DESCRIPTION
This sensor detects the rotation speed of the input turbine. By comparing the input turbine speed signal (NT) with the counter gear speed sensor signal (NC), the ECM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions. Thus, providing smooth gear shift.
Reference (Using an oscilloscope): Check the waveform between terminals NT+ and NT- of the ECM connector.
Standard: Refer to the illustration.
MONITOR DESCRIPTION
The NT terminal of the ECM detects a revolution signal from the speed sensor (NT) (input RPM). The ECM calculates a gearshift comparing the speed sensor (NT) with the speed sensor (NC).
While the vehicle is operating in 2nd, 3rd, 4th or 5th gear in the shift position of D, if the input shaft revolution is less than 300 rpm *1although the output shaft revolution is more than 1,000 rpm *2, the ECM detects the trouble, illuminates the MIL and stores the DTC.
*1: Pulse is not output or is irregularly output.
*2: The vehicle speed is 50 km/h (31 mph) or more.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT SPEED SENSOR INSTALLATION
(a) Check the speed sensor installation.
OK: The installation bolt is tightened properly and there is no clearance between the sensor and transaxle case.
2 INSPECT SPEED SENSOR (NT)
(a) Disconnect the speed sensor connector from the transaxle.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance
3 CHECK HARNESS AND CONNECTOR (SPEED SENSOR - ECM)
(a) Connect the speed sensor connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for short)
REPLACE ECM
Transmission Fluid Temperature Sensor "A"
Performance
DESCRIPTION
The ATF (Automatic Transmission Fluid) temperature sensor converts the fluid
temperature into a
resistance value which is input into the ECM.
MONITOR DESCRIPTION
The ATF temp ...
Brake Switch "B" Circuit High
DESCRIPTION
The purpose of this circuit is to prevent the engine from stalling while
driving in lock-up condition when
brakes are suddenly applied.
When the brake pedal is depressed, this s ...
Other materials:
Removal
HINT:
For the parking brake cable assembly No. 2, perform the
same procedure to the parking brake cable assembly No. 3.
1. REMOVE REAR WHEEL
2. REMOVE REAR BRAKE DRUM SUB-ASSEMBLY (for
Drum Type) (See page BR-37)
3. REMOVE FRONT BRAKE SHOE (for Drum Type) (See
page BR-37)
4. REMOVE REAR BRAK ...
Rear Power Seat Switch Circuit
DESCRIPTION
When the power rear no. 2 seat switch is operated, a recline signal is sent
to the fold seat control ECU.
The ECU activates the reclining motor based on the signal from the power rear
no. 2 seat switch.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT FOLD SEAT CONTROL ECU
...
Short to B+ in Rear Curtain Shield Squib LH
Circuit
DTC B1638/86 Short to B+ in Rear Curtain Shield Squib LH
Circuit
DESCRIPTION
The rear curtain shield squib LH circuit consists of the center airbag sensor
assembly and the curtain
shield airbag assembly LH.
The circuit instructs the SRS to deploy when deployment conditions are met.
DTC B ...
