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Toyota Speed Sensors

Page history last edited by wilbo666 2 months ago


 

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 battery power (+12V)  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 normally 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 mounted 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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Comments (4)

Russ said

at 12:23 pm on Aug 5, 2019

Hi Will.
I am beating my brains on my jzs161 trying to figure out how to connect a blitz powermeter.
In terms of which speed sensor wires do I tap into
I believe the blitz requires two speed inputs and i dont have a wiring diagram for it.(used buyee to buy off yahoo japan)

Any light ypu might shed? While i keep searching for the blitz info.

Cheers...Mate😁

wilbo666 said

at 9:46 pm on Aug 10, 2019

Hi Russ,

No definite help, but it appears that looking at the JZS161 wiring diagram that the dash may output a SPD signal to the Powersteering ECU... I would attempt to connect the Orange Blitz Powermeter wire to this and see if this works... See page 3-24 of the JZS161 wiring diagrams...
http://wilbo666.pbworks.com/w/file/fetch/58278386/JZS16x%20Electrical%20Wiring%20Diagram%20Book%206748505.pdf

Another option could be to try the Engine ECU SP2+ signal. The output from this speed sensor isn't a square wave, but it may still work... If it doesn't I would suggest that one option is a small circuit / device to adapt the signal. Something like a Dakota Digital SGI-5E may work (Note: I haven't used one of these, so please do your own research! :)

Matt Pinyo said

at 9:13 am on Nov 24, 2019

Hi Will,
I changed the diff with a different feel gear ratio so I'm trying to install a Dakota speed signal converter to my jzx100. Some people have told me to intecept the speed signal sensor near ecu but I'm unsure of how the signal is then passed to the dash. Does the speed sensor at the gearbox (r154) feed the signal to to the cluster first and then the cluster to the ecu, or does it go to the ecu first then the cluster?
Another option I was thinking of is intercepting the signal right behind the cluster itself. However, I cant find much information about the pintouts for the cluster.
I know the wire from the speed signal sensor is light blue with red dash. Would it be the same one behind the cluster?

Thanks so much. Your page is awesome.

wilbo666 said

at 5:51 pm on Dec 4, 2019

Hi Matt,

I'm not sure regarding JZX100 specifically, but most Toyota engine ECUs receive their speed signals via the dash.
Ideally you would want to review the JZX100 wiring diagram.

If that is the case, and you want the dash Speedo to read correctly then you would want to intercept the 3 wire speed sensor signal prior to the dash.

Good luck :)

Cheers
Wilbo

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