Where are the Vss sensors in my 02 Grand Am and which is input and which is output

well lost the service manual, id not own any kia.
some transmissions have 3 speed sensors.
some cars have 3 engines, and 3 different transmission.
none old. Trans-axle i it is . FWD
the 3.5 L Hyundai V6????? and had 4 or 5 speed box.
and are not the same. not diesel, not 2.5L
no only the rear VSS sensor is road speed.
on my car ABS is the VSS road speed sensor only.
so learn to read the service manual and not guess.
ok no ABS so car is not in USA ,?

the VSS in on the OUTPUT main shaft of the tranny.
what I do is ask Kia which tranny box is there.the real name.
like Aisin a340 or? the like then look up that box.
or go to the parts houses for your transmission and page one shows VSS output, clear as day.

NO VIN told and no dealer sells parts lacking that
nor will I help you with exact answers.
no engine told but is in VIN #8 digit
I see KIA USA has no tranny parts for this car. zip.

Trans-Axle - Kia (45000-39560R) good luck finding parts, yes car stores have the sensor once real model transmission is told above is for 3.5L

The 1994 Shadow came with a standard 3 speed automatic (A413), and with an optional 4 speed automatic (A604). If your shadow has the 3 speed, it has only one - the output sensor (VSS). Only if you have the 4 speed it does have both the output sensor and input sensor. The input sensor is about six inches to the left of the output sensor at the same level on the transmission.

taking your vehicle to a qualified reair shop to have it diagnosed would be a good thing to do . You could not have traced all wires ! Because i'm sure you haven't any idea how this works . An a factory scan tool is a must to diagnose this .Do you know what ford SCP data network is ?
Speedometer
The instrument cluster receives the vehicle speed signal from the powertrain control module (PCM) over the standard corporate protocol (SCP) network and displays it on the speedometer gauge. If the instrument cluster receives no vehicle speed signal after one second, the speedometer defaults to 0.0 km/h (0.0 mph).

Vehicle Speed Sensor
The vehicle speed sensor (VSS) (Figure 52) is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.

P0500 - Vehicle Speed Sensor (VSS) Malfunction Indicates the powertrain control module (PCM) detected an error in the vehicle speed information. Vehicle speed data is received from either the vehicle speed sensor (VSS), the transfer case speed sensor (TCSS) or the anti-lock brake system (ABS) control module. If the engine RPM is above the torque converter stall speed (automatic transmission) and the engine load is high, it can be inferred that the vehicle must be moving. If there is insufficient vehicle speed data input, a malfunction is indicated and a DTC is set. On most vehicle applications the malfunction indicator lamp (MIL) is triggered when this DTC is set.

• Open in the VSS+/VSS- harness circuit.
• Open in the TCSS signal or the TCSS signal return harness circuit.
• Short to GND in the VSS harness circuit.
• Short to GND in the TCSS harness circuit.
• Short to PWR in the VSS harness circuit.
• Short to PWR in the TCSS harness circuit.
• Damaged drive mechanism for VSS or TCSS.
• Damaged VSS or TCSS.
• Damaged wheel speed sensors.
• Damaged wheel speed sensor harness circuits.
• Damage in the module(s) connected to the VSC/VSS circuit.
• Open or short in the vehicle speed circuit VSS signal between the ABS VSS signal output and the VSS signal inputs to the PCM and other modules (Excursion and F-Super Duty).

Monitor the VSS PID while driving vehicle. This DTC is set when the PCM detects a sudden loss of vehicle speed signal over a period of time. If vehicle speed data is lost, check the source of where the vehicle speed input originates from: VSS, TCSS or ABS. Note: On some MSOF applications, VSS and TCSS PID can be monitor. However if no TCSS PID is available and VSS PID is zero, TCSS circuitry frequency must be checked for loss of sensor signal. If another vehicle electronic module has generated the P0500 and the vehicle does not receive its vehicle speed input from one of the above mention sources (VSS, TCSS or ABS). Check the PCM for Output Shaft Speed Sensor (OSS) DTCs. On OSS applications the PCM uses the OSS to calculated the vehicle speed. If no OSS DTCs are found check for correct PCM configuration. Check PCM configuration for correct tire size and axle ratio. P0501 - Vehicle Speed Sensor (VSS) Range/Performance Indicates the powertrain control module (PCM) detected an error in the vehicle speed information. This DTC is set the same way as P0500, however the malfunction indicator lamp (MIL) is not triggered.

• Refer to possible causes for P0500.

Refer to Diagnostic Aids for P0500. P0503 - Vehicle Speed Sensor (VSS) Intermittent Indicates poor or noisy VSS performance. Vehicle speed data is received from either the vehicle speed sensor (VSS), the transfer case speed sensor (TCSS), or the anti-lock brake system (ABS) control module.

• Noisy VSS/TCSS input signal from the radio frequency interference / electro-magnetic interference (RFI/EMI) external sources, such as ignition components or the charging circuit.
• Damaged VSS or driven gears.
• Damaged TCSS.
• Damaged wiring harness or connectors.
• Malfunction in the module(s) or circuit connected to the VSS/TCSS circuit.
• After market add-on.

Monitor the VSS PID while driving the vehicle. Check for intermittent vehicle speed indication. Verify the ignition and charging system are functioning correctly.

What make , model and year vehicle ? Most vehicles the VSS - vehicle speed sensor is a input to the engine computer (PCM/ECM) The PCM sends a message via a serial data communication network to the instrument cluster ,which interpits the message and controls the speedometer ! If the VSS was bad the transmission wouldn't shift correctly . Is the check engine light lit on the instrument cluster.

to check VSS operation back probe two terminals of the vss connector using voltmeter probes.you can check VSS sensor while still in vechicle.to check vss sensor connect voltmeter probes to vss sensor two wire terminals set voltmeter on the AC scale turn on the ignition to on position rotate front wheel by hand watching voltmeter vss sensor should produce a minimum of 0.5 volts and the voltage should increase as the transaxle out put shaft rotates faster.

P0500 Vehicle Speed Sensor "A"
P0501 Vehicle Speed Sensor "A" Range/Performance
P0502 Vehicle Speed Sensor "A" Circuit Low Input
P0503 Vehicle Speed Sensor "A" Intermittent/Erratic/High
Vehicle Speed Sensor Removal & Installation Automatic Transmission To Remove:

1. Remove or disconnect the following:
   • Output shaft speed (OSS) sensor electrical connector.
   • Bolt and OSS sensor

To Install:

1. Apply a light coat of petroleum jelly to the O-ring before installation
2. Install or connect the following:
   • OSS sensor torque bolt to 89 in-lbs (10 Nm)
   • OSS sensor electrical connector

Manual Transmission To Remove:

1. Remove or disconnect the following:
   • Vehicle Speed Sensor (VSS) electrical connector.
   • Retaining pin.
   • VSS.

To Install:

1. Install or connect the following:
• VSS.
• Retaining pin.
• VSS connector.

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The VSS is on the transmission near the output shaft. It will not be a wheel speed sensor on the hub.

Good luck on this repair, tommy.

If the odometer and tripmeter stop incrementing their mile values, then the VSS or vehicle speed sensor is bad or has become disconnected.

Vehicle Speed Sensor OPERATION The Vehicle Speed Sensor (VSS) is a magnetic pick-up sensor that sends a signal to the Powertrain Control Module (PCM) and the speedometer. The sensor measures the rotation of the transmission output shaft or the ring gear on the differential and sends an AC voltage signal to the PCM which determines the corresponding vehicle speed.
TESTING

1. Disconnect the negative battery cable.
2. Disengage the wiring harness connector from the VSS.
3. Using a Digital Volt-Ohmmeter (DVOM), measure the resistance (ohmmeter function) between the sensor terminals. If the resistance is 190-250 ohms, the sensor is okay.

REMOVAL & INSTALLATION Fig. 1: Detach the connector for the VSS sensor
Fig. 2: Remove the retaining bolt for the VSS sensor and . . .
Fig. 3: . . . remove the VSS sensor from the transmission
Fig. 4: Pry the retainer for the VSS gear off and . . .
Fig. 5: . . . remove the gear from the VSS

1. Disconnect the negative battery cable.
2. Raise and safely support the vehicle securely on jackstands.
3. Detach the connector for the VSS.
4. Remove the VSS retaining bolt and remove the VSS from the transmission.
5. Remove the driven gear retainer and the drive gear. To install:
   
6. Inspect the O-ring on the sensor and replace if necessary.
7. Install the driven gear and the retainer.
8. Place the VSS into the transmission.
9. Tighten the retaining bolt to 98-115 inch lbs. (11-13 Nm).
10. Attach the VSS electrical connector.
11. Lower the vehicle.
12. Connect the negative battery cable.

The vss is mounted on the rt axle shaft housing at the top of the housing on an automatic and man trans.

if this helps, please rate as fixya. thanks.

Vehicle Speed Sensor The vehicle speed sensor (VSS) (Figure 43) is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.



For the 4R70W trans vehicles

Vehicle Speed Sensor (VSS)

The vehicle speed sensor (VSS) is model dependent. Possible sources of vehicle speed input are, anti-lock brake sensor (ABS), a gear-driven vehicle speed sensor (VSS), or the transmission output shaft speed (OSS) sensor. On 4x4 applications with a manual shift transfer case, the transfer case speed sensor is the source of vehicle speed. The VSS signal is either an AC signal whose frequency changes with vehicle speed, or an SCP data message depending on the source. Some vehicles have both. The vehicle speed signal is an input to various vehicle sub-systems such as the powertrain control module (PCM), instrument cluster (speedometer and odometer), speed control systems, etc. The vehicle speed source must be operational to enter output state control mode for diagnostics.

If you have a 4R100 trans, it is different.

The VSS sensor is located on the transaxle .
If the VSS is defective replace the instrument cluster