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Old 12-07-2016, 01:04 AM   #1
Jimmy123
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Default What Runs The Odometer

On the Pre 1998 (I Think) Saturns with the mechanical odometer, what does that run off of to make the mileage go up. The reason I am asking is because I am doing an engine swap and am trying to figure out how to make everything work. I know the S-Series doesn't have a speedometer cable, so it must run off something electronic but I can't seem to find that information.

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Old 12-07-2016, 01:15 AM   #2
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Default Re: What Runs The Odometer

5000pulses/mile from the PCM. Below from FSM.

SPEEDOMETER/ODOMETER
The speedometer receives vehicle speed information from the Powertrain Control Module (PCM ). The vehicle speed signal is passed through an RC filter to the input of the speedometer/odometer driver Integrated Circuit (IC ), located in the instrument panel cluster. The high-to-low edge of the square wave input triggers the IC to provide a well defined pulse of current to the coil of the speedometer gage. The IC also counts the input transitions and uses this information to drive the odometers. The vehicle completes one mile for every 5000 pulses received from the PCM.

There are two odometers in the instrument panel cluster. The odometer shows total mileage since the vehicle was built and cannot be reset. The trip odometer which shows total mileage since last reset, and can be reset to zero at any time. The two odometers are not synchronized. This means that even through one of the odometers may advance by a mile/kilometer the other one may or may not advance to the next mile/kilometer at the same time. The odometer is back lit by a single bulb to make it easier to read in all lighting conditions.

NOTE: The odometer always powers up in the season odometer mode, regardless of which mode was selected before turning ignition Off.

The button located next to the odometer allows you to switch from odometer (6 digit display) to trip odometer (4 digit display). By pressing this button, you can toggle between the odometer and the trip odometer. To reset the trip odometer to zero, select trip odometer and hold the button in for one to two more seconds .

NOTE: The odometer mileage remains readable for several minutes after ignition is turned Off.

TACHOMETER
The tachometer is directly controlled by the powertrain control module (PCM) using a Pulse Width Modulated (PWM ) signal based on the signal received from the Crankshaft Position (CKP ) sensor. The PWM signal to the cluster is passed through an RC filter and sent to the tachometer driver integrated circuit (IC). The high-to-low edge of the PWM signal triggers the IC to provide a well defined pulse of current to the coil of the tachometer. The engine completes one revolution for every six pulses received from the PCM. The PCM monitors circuit 121 for an open, short to ground or short to voltage and will set DTC P1693 if certain parameters are met.

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Old 12-07-2016, 05:33 PM   #3
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Default Re: What Runs The Odometer

^^ OldNuc, is this saying that the mechanical odometer display is controlled and toggled the same way as the digital? I believe the OP is asking for how just the mechanical one works.

Just a slight correction to the OP.
My 1998 SW2 has the mechanical display, not digital. Build date was 09/97 though.

Last edited by toggenburg; 12-07-2016 at 05:39 PM..

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Old 12-07-2016, 05:53 PM   #4
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Default Re: What Runs The Odometer

Identical inputs, the clusters will swap. The indication driver is different though, electronic vs. electro-mechanical.

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Old 12-07-2016, 11:54 PM   #5
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Default Re: What Runs The Odometer

As some of you know, I'm doing a TDI conversion on a Saturn and was trying to figure out a way to hook up the Saturn odometer to the VW somehow. Is there any way to generate that type of signal and make it read off the speedometer to generate the correct mileage?

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Old 12-08-2016, 12:07 AM   #6
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Default Re: What Runs The Odometer

Need to know what VW does and you know what Saturn does. Once you know both then you can worry about a solution.

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Old 12-08-2016, 08:41 AM   #7
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Default Re: What Runs The Odometer

I asked over on the the TDIclub forums and was told that the VW odometer works in a very similar manner, I haven't got the exact figure yet but it runs off of so many thousand pulses per mile from the VSS. I'll let you guys know when I get the exact number of pulses it takes.

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Old 12-08-2016, 10:25 AM   #8
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Default Re: What Runs The Odometer

The number of pulses is determined by the number of notches on the carrier. yhrn you have to figure the rest of the drivetrain to get the pulse/mile number.

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Old 12-08-2016, 09:56 PM   #9
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Default Re: What Runs The Odometer

Well I plan on running Dakota Digital Speedometer Signal Converters to mate the Saturn speedo with the VW VSS so I'm wondering if I get that to work correctly if the odometer will also work correctly. I found the speed signal wire in the Saturn cluster wiring diagram, so I would guess if I mate that with the VW VSS wire that would go to it's cluster and the signal converter I could get it to work 100% correctly.

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Old 12-10-2016, 11:00 PM   #10
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Default Re: What Runs The Odometer

there are companies that make nice GPS Boat Speedometers that run off the GPS Satellite. If you Google it, the manufactures will be listed. Some of them are quite nice.

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Old 12-11-2016, 12:58 AM   #11
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Default Re: What Runs The Odometer

Quote:
Originally Posted by Jimmy123 View Post
Well I plan on running Dakota Digital Speedometer Signal Converters to mate the Saturn speedo with the VW VSS so I'm wondering if I get that to work correctly if the odometer will also work correctly. I found the speed signal wire in the Saturn cluster wiring diagram, so I would guess if I mate that with the VW VSS wire that would go to it's cluster and the signal converter I could get it to work 100% correctly.
That green wire is direct from the PCM and is the shaped VSS signal. You can feed that into the Dakota converter. The odometer is driven by the same signal.

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Old 12-21-2016, 08:10 PM   #12
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Default Re: What Runs The Odometer

I suspect both cars' instrument clusters were Mfd by VDO.

My 1982 VWrabbit and my '97 Saturn both had VDO clusters.

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