Page 56 - Hydra-matic 6 Speed RWD Technician's Guide (October 2005)

ELECTRICAL COMPONENTS

Clutch Pressure Control (PC) Solenoids 2, 3, 4 & 5:
The clutch pressure control (PC) solenoids 2 and 3 are nor- CONTROL
COIL
mally-high PC solenoids and are identical to the line PC sole- PRESSURE ASSEMBLY
noid (page 46). The clutch PC solenoids 4 and 5 are normally- SUPPLY HOUSING
low and are the same as the TCC PC solenoid (page 45). PRESSURE EXHAUST
(ACTUATOR
The clutch PC solenoid 2 controls fluid flow to the 3-5 and FEED LIMIT)
reverse clutch regulator and 3-5 and reverse clutch boost valves.
When commanded, the PC solenoid controls the flow of ex-
haust fluid out of the solenoid to maintain a specific com-
manded control pressure. This allows the TCM to control the CONNECTOR
apply and release of the 3-5 and reverse clutch.
CLOSED END
The clutch PC solenoid 3 controls fluid flow to the 4-5-6 clutch FEATURE O-RING VARIABLE
regulator and 4-5-6 clutch boost valves. When commanded, the RESTRICTION
PC solenoid controls the flow of exhaust fluid out of the sole- NORMALLY-LOW PRESSURE CONTROL SOLENOID
noid to maintain a specific commanded control pressure. This
allows the TCM to control the apply and release of the 4-5-6
clutch. CONTROL COIL
PRESSURE
ASSEMBLY
The clutch PC solenoid 4 controls fluid flow to the 2-6 clutch SUPPLY HOUSING
PRESSURE
regulator valve. When commanded, the PC solenoid controls (ACTUATOR EXHAUST
the flow of exhaust fluid out of the solenoid to maintain a FEED LIMIT)
specific commanded control pressure. This allows the TCM to
control the apply and release of the 2-6 clutch.
The clutch PC solenoid 5 controls fluid flow to the 1-2-3-4
clutch regulator and 1-2-3-4 clutch boost valves. When com- CONNECTOR
manded, the PC solenoid controls the flow of exhaust fluid out CLOSED END
of the solenoid to maintain a specific commanded control pres- FEATURE O-RING VARIABLE SPRING
sure. This allows the TCM to control the apply and release of RESTRICTION
the 1-2-3-4 clutch.
NORMALLY-HIGH PRESSURE CONTROL SOLENOID

Clutch Pressure Control (PC) Solenoid Logic
LINE
PC Sol 5 PC Sol 4 PC Sol 2 PC Sol 3 PS5 DRIVE 1-6
Gear 38
N.L. N.L N.H. N.H. CBR1/C456 CL REG VALVE
Park OFF OFF OFF ON ACT FD LIM
CBR1/C456 39 EX EX 37
PRESSURE PCS CBR1/456 CL EX BF
Reverse OFF OFF ON ON CONTROL
SOLENOID 3 CBR1/456 CL FD CBR1 FDBK
Neutral OFF OFF OFF ON N.H. ON
Drive 1 Engine Braking ON OFF OFF ON
31
Drive 1 ON OFF OFF OFF CBR1/456 CL FD
456 CL BOOST VALVE
Drive 2 ON ON OFF OFF
EX
Drive 3 ON OFF ON OFF
Drive 4 ON OFF OFF ON
Drive 5 OFF OFF ON ON 35R CL BOOST VALVE
Drive 6 OFF ON OFF ON 40 EX
35 REV CL FDBK
Transmission Adapt Function: PS1
Programming within the TCM also allows for automatic PCS 35 REV CL 35 REV CL
adjustments in shift pressure that are based on the changing EX
characteristics of the transmission components. As the apply 3-5 REV CL REGULATOR VALVE
components within the transmission wear or change over time, 47 46 EX
shift time (the time required to apply a clutch) increases or ACT FD LIM 48 ACT FD LIM
decreases. In order to compensate for these changes, the TCM EX BF 35R FD
adjusts the pressure commands to the various PC solenoids, to
maintain the originally calibrated shift timing. The automatic ACT FD LIM ACT FD LIM
C35R
adjusting process is referred to as “adaptive learning” and it is PRESSURE
CONTROL
SOLENOID 2 1234 CL
used to ensure consistent shift feel plus increase transmission N.H. OFF ACT FD LIM
durability. The TCM monitors the A/T ISS and the A/T OSS
1234 CL BOOST VALVE
during commanded shifts to determine if a shift is occurring too
29
fast (harsh) or too slow (soft) and adjusts the corresponding PC EX
solenoid signal to maintain the set shift feel. EX 1234 CL
456 CL ACT FD LIM SHTL 1-2-3-4 CL REGULATOR VALVE PCS 1234 CL 1234 CL FDBK
26 CL/1234 CL FD
42 43 36 35 34 33 PS4 EX 50
ACT FD LIM
2-6 CLUTCH REG
EX BACKFILL 1234 CL FD
CB26 44 1234 CL DFLT
PRESSURE 2-6 GAIN EX BF 26 CL PS3 EX 26 CL 41 C1234
CONTROL PCS 26 CL PRESSURE PCS 1234 CL
SOLENOID 4 CONTROL
SOLENOID 5
N.L. OFF 26 CL N.L. OFF
Figure 43 47