Workshop

HYDRA-MATIC 6L80 (6 Speed)

ELECTRONIC COMPONENTS (CONT'D) NORMALLY-HIGH PRESSURE CONTROL SOLENOID
PRESSURE CONTROL SOLENOIDS
CONTROL
PRESSURE
(PCS LINE)
SUPPLY
PRESSURE
(ACTUTOR
FEED LIMIT)
COIL
ASSEMBLY
HOUSING
EXHAUST
SPRING
VARIABLE
RESTRICTION
CONNECTOR
Line Pressure Control (PC) Solenoid
The line pressure (PC) solenoid is a precision
electronic pressure regulator that controls line
pressure based on current flow through its coil
windings. The TCM varies current to the "normally-
high" line pressure control (PC) solenoid from
approximately 0.1 amp (maximum line pressure), to
1.0 amps (minimum line pressure). As current flow is
increased, the magnetic field produced by the coil
moves the solenoid's variable restriction further
away from the exhaust port, as shown in Figure 11.
Opening the exhaust port decreases the control
pressure, which is routed to the isolator (boost) valve,
as shown in Figure 11, which ultimately decreases
line pressure. As the current flow is decreased, the
reduced magnetic field allows the spring force to
move the variable restriction to the left, as shown in
Figure 11, closer to the exhaust port, increasing
control pressure from the solenoid, which ultimately
increases line pressure.
As the throttle position (engine torque) increases, the
current flow is decreased by the TCM, which
increases the pressure output of the line pressure (PC)
solenoid. If the TCM detects a line pressure control
solenoid electrical malfunction, a DTC will be
activated.
ISOLATOR
PCS LINE
LINE
EXHAUST
LINE
CONV FEED
DECREASE
PRESSURE REGULATOR VALVE
Figure 11
The line pressure control (PC) solenoid is part of
the Control Solenoid Body And TCM Assembly and
is not serviced seperately.
If for any reason, the entire electronic control system
of the transmission fails, the line pressure control
solenoid will be OFF, and maximum line pressure will
be the result. This will create harsh engagements.
AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
12
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