Volvo All Engines (2010 Emissions) Fault Code: SPN 647 FMI 4 PID: SID 33 Engine Fan Clutch Output Device Driver

Electronic Viscous Fan: The Electronic Fan Drive contains a solenoid that controls the flow of fluid between reservoirs in the fan drive housing and cover. The Engine Control Module (ECM) provides a (PWM) Pulse Width Modulation signal to the solenoid and controls solenoid operation to optimize fan speed, based on coolant temperature, intake air temperature and A/C load.

Conditions for diagnostic trouble code (DTC):
1) The fan solenoid valve is activated because the control wire is shorted to ground
2) Short circuit to ground on A14.EB:49

Observable symptoms
1) Engine fan permanently disengaged
2) High engine coolant temperature (ECT)

Probable cause
1) Solenoid valve, engine fan
2) Wiring harness
3) Connector
4) Engine control module (ECM)