MBE 900 4000 Troubleshooting – Section 5.1 Description of PID 84 — Vehicle Speed Sensor Fault

Section 5.1
Description of PID 84 — Vehicle Speed Sensor Fault

PID 84 indicates that during engine operation the vehicle speed that is measured by the Vehicle Speed Sensor (VSS) is less than the expected value for the current engine speed/conditions. See Figure "Vehicle Speed Sensor" . The road speed limiter (if equipped) will use top gear ratio and limit engine speed.‪

Figure 1. Vehicle Speed Sensor

This diagnostic condition is typically:‪

• Open Sensor Signal Circuit (084 03)
• Short to Ground (084 04)