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Toyota Speed Sensors

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Saved by wilbo666
on July 2, 2012 at 7:39:36 pm
 


 

Introduction

This page documents Toyota speed sensors.

 

There are two main types of Toyota speed / position sensor, '3 Wire' and '2 Wire'.  These are described in more detail below.

 

3 Wire Speed Sensor

The 3 wire speed sensor output signal is a square wave signal that connects between the input power source (battery voltage) and the power ground.  The speed sensor outputs 4 pulses (High to Low voltage transitions) for each speed sensor revolution.

 

Most Toyota 3 wire speed sensors have the below (90980-11143) plug connection, however it is worth noting that there are some 20 pulse / revolution Toyota speed sensors that have a different (triangular) plug connection.  Note, the below plug (90980-11143) connects to the speed sensor, the below plug image does not show the pin out of the sensor, it shows the pin out of the plug that connects to the speed sensor.

 

 

 

Pin Symbol Definition Input / Output
(To Sensor = Input)
(From Sensor = Output)
Description Usual Wire Colour
1 IGN
3 Wire, Speed Sensor Power (Ignition Switched) Input This pin is used to supply ignition switched power to the speed sensor.  This pin needs to be connected to an ignition switched power source that supplies battery voltage when the ignition is in the RUN and CRANK Positions. Yellow (Y)
2   3 Wire, Speed Sensor Ground Input This pin is used to supply the power ground for the speed sensor.  This pin needs to be connected to ground. Red (R)
3 SP1 3 Wire, Speed Sensor Output Output

This pin is used to output the speed signal.  This pin most commonly connects to the dash cluster, however in some arrangements this can vary.

The 3 wire speed sensor output signal is a square wave signal that connects between the input power source (battery voltage) and the power ground.  The speed sensor outputs 4 pulses (High to Low voltage transitions) for each speed sensor revolution.

Light Blue - Red Dash (L-R)

 

 

2 Wire Speed Sensor

The 2 wire speed sensor is a variable reluctance, also refereed to as 'reluctor' or 'inductive' type sensor.  This type of speed sensors outputs an AC type voltage waveform transition each time the speed sensor passes past a ferromagnetic tooth.  The sensor requires no external power, unlike the 3 wire speed sensor which requires external power.

 

It is relevant to note that when the polarity of the two wires of the 2 wire speed sensor are correct the voltage will rise and then fall.

The voltage and frequency will both increase as the rotor speed increases.

 

Toyota 2 wire speed sensors have the below (90980-11156) plug connection.  Note, the below plug connects to the speed sensor, the below plug image does not show the pin out of the sensor, it shows the pin out of the plug that connects to the speed sensor.

 

Pin Symbol Definition Input / Output
(To Sensor = Input)
(From Sensor = Output)
Description
1 SP2+ 2 Wire Speed Sensor Signal Positive (+) Output This pin is used as the positive reference of the AC voltage signal that is outputted.
2 SP2- 2 Wire Speed Sensor Signal Negative (-) Output This pin is used as the negative reference of the AC voltage signal that is outputted.

 

 

 

Dash & Engine ECU Speed Sensor Connections

There are a number of different arrangements which are used to connect the vehicle speed sensor to both the dash cluster and the engine (and other) ECUs.

 

The most common connection is as follows:

     Gearbox mounted 3 wire speed sensor -> Dash -> Engine ECU

 

JZA80 VVTi Automatic have an unconventional arrangement in which the engine ECU is responsible for generating the speed signal to the dash.

     Gearbox mount 2 wire speed sensor -> Engine ECU -> Dash

 

Later model systems use the Multiplex (serial communications network) to transmit the speed signal to the dash.

     Gearbox mounted speed sensor (3 or 2 wire depending on automatic or manual transmission) -> Engine ECU -> Dash (via Multiplex network)

 

 

 

References

Autoshop101: 36 Sensors#6 - Speed Sensors with questions.pdf

http://en.wikipedia.org/wiki/Inductive_sensor 

http://en.wikipedia.org/wiki/Electromagnetic_induction 

 

 

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