• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
VSS Low Signal | -- | P0500 | -- | -- |
VSS High Signal | P0500 | P0500 | P0500 | -- |
The vehicle speed information is provided to the powertrain control module (PCM) by the vehicle speed sensor (VSS). The VSS is a permanent magnet generator that is mounted to the transmission and produces a pulsing voltage. The AC voltage amplitude and frequency increases with vehicle speed. The PCM converts the pulsing voltage into km/h (mph). The PCM supplies the VSS signal to the following components:
• | The instrument panel for speedometer and odometer operation |
• | The cruise control module |
All conditions are met for 2 seconds.
• | DTC P0016, P0106, P0107, P0108, P0120 or P0220 are not set. |
• | The engine coolant temperature is 35°C (95°F) or greater. |
• | The throttle position (TP) sensor is greater than 3.5 percent. |
• | The engine speed is greater than 1,000 RPM. |
• | Manifold absolute pressure (MAP) is 40-100 kPa (6-15 psi) with A/C OFF. |
• | MAP is 45-100 kPa (7-15 psi) with A/C ON. |
The PCM detects no vehicle speed for 50 seconds.
P0500 is a Type B DTC.
P0500 is a Type B DTC.
Manual Transmission Schematics
Transmission System Description and Operation
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
J 35616 GM-Approved Terminal Test Kit
⇒ | If the value is greater than 3,160 ohms test the VSS high signal circuit and the VSS low signal circuit for an open/high resistance. If the circuits/connections test normal, replace the vehicle speed sensor. |
⇒ | If the value is less than 1,680 ohms test the VSS high signal and the VSS low signal circuits for a shorted together condition. If the circuits/connections test normal, replace the vehicle speed sensor. |
⇒ | If the value is less than the specified range, repair the short to ground. |
⇒ | If the value is less than the specified range, repair the short to ground. |
⇒ | If all circuits/connections test normal, test or replace the VSS. |
Perform the Diagnostic Repair Verification after completing the repair.
• | Control Module References for PCM replacement, setup and programming |