Speed sensors

[DimitriyCustom]

Where does the 2004 Ranger manual transmission take speed?

 

[BobSacamano]

It's usually on the driver side of the transmission. Sends signal to PCM, then to speedometer. I THINK sometimes they may be on the transfer case.

 

[DimitriyCustom]

It's usually on the driver side of the transmission. Sends signal to PCM, then to speedometer. I THINK sometimes they may be on the transfer case. It's not on the manual transmission. It's not on the transfer case. After much research, I found out that the speedometer uses data from the ABS sensors and the sensor in the axle.

It's not on the mechanical gearbox

It's not on the transfer case

Through long studies, I found out that the speed on the speedometer is taken from the abs sensors and the sensor in the work

 

[BobSacamano]

Starting in 2001, the Ranger gets its raw speed signal from the OSS (Output Shaft Speed) sensor on the transmission/transfer case. The OSS sensor is a magnetic pickup that provides transmission output shaft rotation speed information to the PCM (Powertrain Control Module) where it is corrected for tire diameter and axle ratio.

The PCM uses the OSS sensor signal to help determine EPC (Electronic Pressure Control) pressure, shift scheduling and TCC (Torque Converter Clutch) operation. The PCM outputs the corrected VSS pulse to the speed control and the cluster. In this system the PCM is the correction and distribution point for the VSS signal.

https://www.therangerstation.com/tech/speedometers-how-they-work/#gsc.tab=0

 

[lowspeedpursuit]

I assume you have a US ranger because you put 4.0, but based on location, you're not talking about an international Ranger, right?

 

[DimitriyCustom]

I assume you have a US ranger because you put 4.0, but based on location, you're not talking about an international Ranger, right?

Да машина сша
Поставили механику вместо автомата на мотор 4.0

 

[lowspeedpursuit]

Interesting. So like everyone's already covered, only '98-'00 should be deriving speed from the rear diff ABS sensor. Earlier is a gear-driven sensor on the trans/tcase, and later is a magnetic pickup on the same.

But, for a trans swap, I guess they could have built whatever.

 

[DimitriyCustom]

Interesting. So like everyone's already covered, only '98-'00 should be deriving speed from the rear diff ABS sensor. Earlier is a gear-driven sensor on the trans/tcase, and later is a magnetic pickup on the same.

But, for a trans swap, I guess they could have built whatever.

If it takes the speed from the output sensor on the gearbox, then what speed it shows in reduced gear it means that the speed is not taken from it

 

[SenorNoob]

It's not unusual for the speedometer to be pulled before the transfer case. Can be kinda funny sometimes. Things like reading 90mph while actually doing 38ish.

 

[lowspeedpursuit]

If it takes the speed from the output sensor on the gearbox, then what speed it shows in reduced gear it means that the speed is not taken from it

Can't say I take your meaning. In these the old trucks 2wd will be on the trans and 4wd on the tcase, so you're always after any variable gears, but I agree it's also not that weird for a speedo to just be off in 4low.

 

[DimitriyCustom]

Can't say I take your meaning. In these trucks 2wd will be on the trans and 4wd on the tcase, so you're always after any variable gears, but I agree it's also not that weird for a speedo to just be off in 4low.

Датчик на механике стоит меж раздаточной коробкой и кпп
На выходном валу , а значит на пониженной передаче он врет на 2.43
Но он так не делает, значит не он мерит на машинах с 2002-2009

 

[SenorNoob]

Electronic speedometers are usually adjustable for final drive ratio. Any chance Ford used the same method for low range? Just use the switch on the transfer case to know when to do the extra math?

 

[Curious Hound]

Датчик на механике стоит меж раздаточной коробкой и кпп
На выходном валу , а значит на пониженной передаче он врет на 2.43
Но он так не делает, значит не он мерит на машинах с 2002-2009

The sensor on a manual transmission is located between the transfer case and the gearbox. It's on the output shaft, which means it reads 2.43 in low gear. But it doesn't do that, so it's not the one measuring it on cars from 2002-2009.

On a 4x4 truck, the speed sensor is on the output of the transfer case. It should read correctly in any gear.

 

[DimitriyCustom]

On a 4x4 truck, the speed sensor is on the output of the transfer case. It should read correctly in any gear.

But it's not on the transfer case on these trucks

 

[lowspeedpursuit]

This is a silly argument.

A lot of people who are active here drive older trucks, hence the general answers, but there's a wealth of info available across years:

"The 2001+ Ford Ranger gets its raw speed signal from the OSS (Output Shaft Speed) sensor located on top of the transmission (not on the transfer case)"

So yes, apparently on '01+ it is before the transfer case. If the speedo on these trucks is correct in 4low, I assume the computer was smart enough by '01+ to correct for being in 4low.

I would not assume the article is wrong, conventional understanding is wrong, the OSS is unrelated to the speedometer, and every truck '98+ uses the RABS sensor and no-one ever noticed.