Speedometer & Trip Odometer Malfunctioning

If speedometer and trip odometer are malfunctioning, check for the following and repair as necessary:

• Vehicle Speed Sensor (VSS). See VEHICLE SPEED SENSOR SIGNAL (FROM COMBINATION METER)  under COMPONENT TESTS.
• Faulty VSS circuit. See SPEEDOMETER & VSS CIRCUIT TEST  under SYSTEM TESTS.
• Faulty power and/or ground circuits. See POWER SUPPLY & GROUND CIRCUIT CHECK  under SYSTEM TESTS.
• Faulty unified meter.