DF309 Mercury Mountaineer DTC Code

Mercury Mountaineer Engine Specifications:

Engine Type :	Multi-Cylinder Engine
Cylinder Type :	W-Type Engine
Engine Air Intake Process :	Turbocharged Engine

Your Mercury Mountaineer engine control system detects a problem, the computer stores the diagnostic trouble code DF309 in its memory. To figure out what is wrong with your vehicle you must first extract the DF309 DTC For Mercury Mountaineer.

A good ground connection is also extremely important. DF309 Mercury Mountaineer engine problem because the presence of voltage at the panel harness won't make the panel work if there is a bad ground connection. Since the instrument cluster is mounted in a plastic dash, a separate ground wire or ground circuit through the wiring harness is usually needed to complete the power circuit. Refer again to the wiring diagram to find the ground path, and then check it with your ohmmeter. Do not use a self-powered test light because it cannot measure resistance (any resistance will lower circuit voltage).

DF309 Mercury Mountaineer DTC Meaning

D	Chassis Code - Problem is controller area network wiring bus and modules.
F	SAE - Generic
3	IC Module 4X Ref Circuit Intermittent, No Pulses
0	Air Conditioning (A/C) Clutch Feedback Circuit High Voltage
9	A/C System High Pressure High Temperature

There are currently two main types of cylinder deactivation used today, depending on the type of engine. DF309 Mercury Mountaineer code for the pushrod design which uses solenoids to alter the oil pressure delivered to the lifters. In their collapsed state, the lifters are unable to elevate their companion pushrods under the valve rocker arms, resulting in valves that cannot be actuated and remain closed.