Initial Inspection and Diagnostic Overview

PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS
1. If DTC P0500, Vehicle Speed Sensor Signal Problem, is set, the following occurs:
^ The SERVICE ENGINE SOON Indicator turns on.
^ The SPEED SENSOR FAULT message appears on the driver information center.
^ Cruise control operation is disabled.
^ The PCM disables the torque converter clutch (TCC) signal.
^ The PCM calculates vehicle speed based on transaxle input speed and current gear enabled.
2. Before component replacement, check that system connections are clean and tight.
^ Check for a broken (or partially broken) wire inside of the insulation which could cause system malfunction but prove "GOOD" in a continuity/voltage check with a system disconnected. These circuits may he intermittent or resistive when loaded, and if possible, should be checked by monitoring for a voltage drop with the system operational (under load).
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems.