Your De Soto Firesweep engine control system detects a problem, the computer stores the diagnostic trouble
code B3121 in its memory.
To figure out what is wrong with your vehicle you must first extract the B3121 DTC For De Soto Firesweep.
A good ground connection is also extremely important. B3121 De Soto Firesweep 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).
B3121 De Soto Firesweep DTC Meaning
Body Code - Problem is antilock brake system, electronic suspension and steering systems.
SAE - Generic
Fuel And Air Metering
Cruise Control Servo Indicates Low
PCM Stack Overrun
There are currently two main types of cylinder deactivation used today, depending on the type of engine. B3121 De Soto Firesweep 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.