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)
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