Dodge 2004 Neon SRT4, Diagnostic Manual

Page: 723 / 922

Reverse
Second Gear
No upshifts or downshifts are possible. The posi-
tion of the manual valve alone allows the three
ranges that are available. Although vehicle perfor-
mance is seriously degraded while in this mode, it
allows the owner to drive the vehicle in for service.
Once the DRBIII
t
is in the Transmission portion
of the diagnostic program, it constantly monitors
the PCM to see if the system is in Limp-in mode. If
the transaxle is in Limp-in mode, the DRBIII
t
will
flash the red LED.
3.2.1 AUTOSTICK FEATURE (IF
EQUIPPED)
This feature allows the driver to manually shift
the transaxle when the shift lever is pulled into the
AutoStick position. When in AutoStick mode, the
instrument cluster displays the current gear.
3.2.2 TRANSMISSION OPERATION AND
SHIFT SCHEDULING AT VARIOUS
OIL TEMPERATURES
The transmission covered in this manual has
unique shift schedules depending on the tempera-
ture of the transmission oil. The shift schedule is
modified to extend the life of the transmission while
operating under extreme conditions.
The oil temperature is measured with a Temper-
ature Sensor on the transmission. The Temperature
Sensor is an integral component of the Transmis-
sion Range Sensor (TRS). If the Temperature Sen-
sor is faulty, the transmission will default to a
calculated oil temperature. Oil temperature will
then be calculated through a complex heat transfer
equation
using engine coolant temperature,
battery/ambient temperature, and engine off time
from the Body Control Module (BCM). These inputs
are received from the PCI bus periodically and used
to initialize the oil temperature at start up. Once
the engine is started, the PCM updates the trans-
mission oil temperature based on torque converter
slip speed, vehicle speed, gear, and engine coolant
temperature to determine an estimated oil temper-
ature during vehicle operation. Vehicles using cal-
culated oil temperature track oil temperature rea-
sonably
accurate during normal operation.
However, if a transmission is overfilled, a transmis-
sion oil cooler becomes restricted, or if a customer
drives aggressively in low gear, the calculated oil
temperature will be inaccurate. Consequently the
shift schedule selected may be inappropriate for the
current conditions. The key highlights of the vari-
ous shift schedules are as folows:
Extreme Cold: Oil temperature at start up below
-26.6°C (-16°F)
> Goes to Cold schedule above -24°C (-12°F) oil
temperature
> Park, Reverse, Neutral and 2nd gear only
(prevents shifting which may fail a clutch
with frequent shifts)
Cold: Oil temperature at start up above -24°C
(-12°F) and below 2.2°C (36°F)
> Goes to Warm schedule above 4.4°C (40°F) oil
temperature
> Delayed 2-3 upshift approximately 35-50
Km/h (22 - 31 MPH)
> Delayed 3-4 upshift 72-85 Km/h (45-53 MPH)
> Early 4-3 coastdown shift approximately 48
Km/h (30 MPH)
> Early 3-2 coastdown shift approximately 27
Km/h (17 MPH)
> High speed 4-2, 3-2, 2-1 kickdown shifts are
prevented
> No EMCC
Warm: Oil temperature at start up above 2.2°
(36°F) and below 27°C (36°F)
> Goes to a Hot schedule above 27°C (80°F) oil
temperature
> Normal operation (upshifts, kickdowns, and
coastdowns)
> No EMCC
Hot: Oil temperature at start up above 27°C (80°F)
> Goes to a Overheat schedule above 115°C
(240°F) oil temperature
> Normal operation (upshifts, kickdowns, and
coastdowns)
> Full EMCC, No PEMCC except to engage
FEMCC, except at closed throttle at speeds
above 113-133 Km/h (70-83 MPH)
Overheat: Oil temperature above 115°C (240°F) or
engine coolant temperature above 115C° (240°F)
> Goes to a Hot below 110°C (230°F) oil temper-
ature or a Super Overheat above 135°C
(275°F) oil temperature
> Delayed 2-3 upshift 40-51 Km/h (25-32 MPH)
> Delayed 3-4 upshift 66-77 Km/h (41-48 MPH)
> 2nd gear PEMCC above 35 KM/h (22 MPH)
> Above 35 Km/h (22 MPH) the torque converter
will not unlock unless the throttle is closed
(i.e. at 80 Km/h (50 MPH) a 4th FEMCC to 3rd
FEMCC shift will be made during a part
throttle kickdown or a 4th FEMCC to 2nd
PEMCC shift will be made at wide open
throttle) or if a wide open throttle 2nd
PEMCC to 1 kickdown is made.
> 3rd gear FEMCC from 48-77 Km/h (30-48
MPH)
2
GENERAL INFORMATION