Which Sensor Drives the Speedometer?
Thread Starter
Instructor
Joined: May 2001
Posts: 159
Likes: 2
From: Central Florida
Which Sensor Drives the Speedometer?
Since I decided to install a standalone EMS I've been looking at the schematics to make sure all of the instruments are going to continue to work when the Motronics bow is removed. The speedo has me stumped. I can find a sensor for the Tip but not the 6 spd. Can someone run down the signal source and wiring , or at least enough to get me started tracing the circuit?
Thread Starter
Instructor
Joined: May 2001
Posts: 159
Likes: 2
From: Central Florida
For those that are dying to know:
The ABS control unit receives wheel speed information from sensors at each of the four wheels. Among the many inputs and outputs from the ABS, Pin 17 provides a signal to Pin 6 on the FCU or Frequency Converter Unit, also known as G16, located in the Central Electrics (AKA main fuse box). FCU Pin 5 is the output signal to the speedometer. Pins 2 and 7 are power and ground respectively.
The ABS control unit receives wheel speed information from sensors at each of the four wheels. Among the many inputs and outputs from the ABS, Pin 17 provides a signal to Pin 6 on the FCU or Frequency Converter Unit, also known as G16, located in the Central Electrics (AKA main fuse box). FCU Pin 5 is the output signal to the speedometer. Pins 2 and 7 are power and ground respectively.
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Thread Starter
Instructor
Joined: May 2001
Posts: 159
Likes: 2
From: Central Florida
My pleasure, Arash.
RD,
I don't know the answer to your question. We would have to know what the GPS is looking for and what the characteristics of the speedometer signal are. Unfortunately, I'm currently unable to measure the signal characteristics since my car's brain and central nervous system are hanging from hooks in my garage
RD,
I don't know the answer to your question. We would have to know what the GPS is looking for and what the characteristics of the speedometer signal are. Unfortunately, I'm currently unable to measure the signal characteristics since my car's brain and central nervous system are hanging from hooks in my garage
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Three Wheelin'
Joined: Dec 2004
Posts: 1,479
Likes: 0
From: Lawrenceville, GA
There is a fuse in the speedo circuit too. not sure what number but i could find it. Iy may have something to do with ABS, i can't recall, but when i bought my car, i had to remove the fuse to drive it back from memphis. it was causing shuddering under high speed braking, so it was likely the ABS control unit. As it turned out the POs indy had put wrong rotors on the car. he was told it was a 2k part that was bad. it was just the rotors being wrong size.
