Workshop

HYDRA-MATIC 6L80 (6 Speed)

Shift solenoids 1 and 2 are both identical, normally
closed, 3 port, ON/OFF type solenoids controlled by
the TCM. These shift solenoids work in combination
with the clutch pressure control solenoids to control
the various shift and clutch regulator valves in the
valve body.
When the TCM provides a path to ground for the
electrical circuit to energize (Turn ON) the solenoid,
current flows through the coil assembly in the
solenoid and creates a magnetic field. The magnetic
field moves the plunger and metering ball assembly to
the right, as shown in Figure 10, against the exhaust
seat, thereby blocking the exhaust passage and
creating solenoid control pressure.
Shift solenoids are de-energized (Turned OFF) when
the TCM opens the path to ground for the solenoid's
electrical circuit. With the solenoid OFF, solenoid
spring force moves the plunger and metering ball
assembly to the left, as shown in Figure 10, away from
the exhaust seat and against the feed seat. This blocks
actuator feed limit fluid from entering the solenoid
and allows any existing solenoid control pressure to
exhaust through the solenoid.
Shift Solenoids 1 and 2 are part of the Control
Solenoid Body and TCM Assembly, and are not
serviced seperately.
Actuator feed limit fluid feeds the shift solenoid 1
fluid circuit to control clutch select valve 2. When
shift solenoid 1 is energized (ON), actuator feed limit
fluid is allowed to pass through the solenoid, thereby
creating solenoid 1 control pressure, as shown in
Figure 10. Solenoid 1 control pressure acts against
clutch select valve 2 spring force, to move the valve to
the apply position.
When shift solenoid 1 is de-energized (OFF),
actuator feed limit fluid is blocked from feeding the
solenoid 1 circuit, and any existing solenoid 1 control
pressure exhausts through the solenoid, as shown in
Figure 10.
Actuator feed limit fluid feeds the shift solenoid 2
fluid circuit to control clutch select valve 3. When
shift solenoid 1 is energized (ON), actuator feed limit
fluid is allowed to pass through the solenoid, thereby
creating solenoid 2 control pressure, as shown in
Figure 10. Solenoid 2 control pressure acts against
clutch select valve 3 spring force, to move the valve to
the apply position.
When shift solenoid 2 is de-energized (OFF),
actuator feed limit fluid is blocked from feeding the
solenoid 2 circuit, and any existing solenoid 2 control
pressure exhausts through the solenoid, as shown in
Figure 10.
If for any reason, the entire electronic control system
of the transmission, or any one of the electrical
components within the Control Solenoid Body and
TCM Assembly becomes disabled, the transmission
will default to fail-safe mode. If the transmission is in
1st, 2nd or 3rd gear during an electrical failure, the
transmission will default to 3rd gear. If the
transmission is in 4th, 5th or 6th gear during an
electrical failure, the transmission will default to 5th
gear.
Fail-Safe or Protection Mode
SUPPLY
PRESSURE
(ACTUATOR
FEED LIMIT)
PLUNGER AND
METERING BALL
ASSEMBLY
CONTROL
PRESSURE
SPRING
HOUSING
CONNECTOR
COIL
ASSEMBLY
EXHAUST
ELECTRONIC COMPONENTS (CONT'D)
SHIFT SOLENOIDS 1 AND 2
SHIFT SOLENOID 1 AND 2
Figure 10
Shift Solenoid 1
Shift Solenoid 2
AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
11
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