Volvo Engine D12D AE E3 (Tier 3) Fault Code: PID84 FMI 9 Road Speed
Volvo Engine D12D AE E3 (Tier 3) Fault Code: PID84 FMI 9 Road Speed
DETECTION CONDITIONS:
The engine control unit (E-ECU) registers that the machine speed signal (PID 84) is missing or is not arriving often enough
SYMPTOM:
None
POSSIBLE CAUSES:
1. Defective machine speed sensor.
2. Defective information bus (SAE J1708).
3. Defective vehicle control unit (V-ECU).
