Chrysler RG Voyager. Manual — part 701
be obtained by dividing the Input Speed Sensor value
by the Output Speed Sensor value.
For example, if the input shaft is rotating at 1000
rpm and the output shaft is rotating at 500 rpm,
then the PCM can determine that the gear ratio is
2:1. In direct drive (3rd gear), the gear ratio changes
to 1:1. The gear ratio changes as clutches are applied
and released. By monitoring the length of time it
takes for the gear ratio to change following a shift
request, the PCM can determine the volume of fluid
used to apply or release a friction element.
The volume of transmission fluid needed to apply
the friction elements are continuously updated for
adaptive controls. As friction material wears, the vol-
ume of fluid need to apply the element increases.
Certain mechanical problems within the clutch
assemblies (broken return springs, out of position
snap rings, excessive clutch pack clearance, improper
assembly, etc.) can cause inadequate or out-of-range
clutch volumes. Also, defective Input/Output Speed
Sensors and wiring can cause these conditions. The
following chart identifies the appropriate clutch vol-
umes and when they are monitored/updated:
CLUTCH VOLUMES
Clutch
When Updated
Proper Clutch
Volume
Shift Sequence
Oil Temperature
Throttle Angle
L/R
2-1 or 3-1 coast
downshift
> 70°
< 5°
35 to 83
2/4
1-2 shift
> 110°
5 - 54°
20 to 77
OD
2-3 shift
48 to 150
UD
4-3 or 4-2 shift
> 5°
24 to 70
SHIFT SCHEDULES
As mentioned earlier, the PCM has programming
that allows it to select a variety of shift schedules.
Shift schedule selection is dependent on the follow-
ing:
• Shift lever position
• Throttle position
• Engine load
• Fluid temperature
• Software level
As driving conditions change, the PCM appropri-
ately adjusts the shift schedule. Refer to the follow-
ing chart to determine the appropriate operation
expected, depending on driving conditions.
Schedule
Condition
Expected Operation
Extreme Cold
Oil temperature at start-up below
-16° F
Park, Reverse, Neutral and 2nd
gear only (prevents shifting which
may fail a clutch with frequent
shifts)
Cold
Oil temperature at start-up above
-12° F and below 36° F
– Delayed 2-3 upshift
(approximately 22-31 mph)
– Delayed 3-4 upshift (45-53 mph)
– Early 4-3 costdown shift
(approximately 30 mph)
– Early 3-2 coastdown shift
(approximately 17 mph)
– High speed 4-2, 3-2, 2-1 kickdown
shifts are prevented
– No EMCC
Warm
Oil temperature at start-up above
36° F and below 80 degree F
– Normal operation (upshift,
kickdowns, and coastdowns)
– No EMCC
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ELECTRONIC CONTROL MODULES
8E - 17
POWERTRAIN CONTROL MODULE (Continued)
Schedule
Condition
Expected Operation
Hot
Oil temperature at start-up above
80° F
– Normal operation (upshift,
kickdowns, and coastdowns)
– Full EMCC, no PEMCC except to
engage FEMCC (except at closed
throttle at speeds above 70-83 mph)
Overheat
Oil temperature above 240° F or
engine coolant temperature above
244° F
– Delayed 2-3 upshift (25-32 mph)
– Delayed 3-4 upshift (41-48 mph)
– 3rd gear FEMCC from 30-48 mph
– 3rd gear PEMCC from 27-31 mph
Super Overheat
Oil temperature above 260° F
– All
9
Overheat
9
shift schedule
features apply
– 2nd gear PEMCC above 22 mph
– Above 22 mph the torque
converter will not unlock unless the
throttle is closed or if a wide open
throttle 2nd PEMCC to 1 kickdown
is made
OPERATION - SENSOR RETURN - PCM INPUT
The sensor return circuit provides a low electrical
noise ground reference for all of the systems sensors.
The sensor return circuit connects to internal ground
circuits
within
the
Powertrain
Control
Module
(PCM).
DATA BUS COMMUNICATION RECEIVE - PCM
INPUT
The PCM uses the SCI communication bus to pre-
form engine diagnostics and flash operations. The
transmission side of the PCM uses the SCI commu-
nication bus to flash new software. However, diagnos-
tics is performed via the vehicles J1850 bus for the
transmission side of the PCM.
OPERATION - IGNITION SENSE - PCM INPUT
The ignition sense input informs the Powertrain
Control Module (PCM) that the ignition switch is in
the crank or run position.
PCM GROUND
Ground is provided through multiple pins of the
PCM connector. Depending on the vehicle there may
be as many as two different ground pins. There are
power grounds and sensor grounds.
The power grounds are used to control the ground
side relays, solenoids, ignition coil or injectors. The
signal ground is used for any input that uses sensor
return for ground, and the ground side of any inter-
nal processing component.
The PCM case is shielded to prevent RFI and EMI.
The PCM case is grounded and must be firmly
attached to a good, clean body ground.
Internally all grounds are connected together, how-
ever there is noise suppression on the sensor ground.
For EMI and RFI protection the housing and cover
are also grounded separately from the ground pins.
OPERATION
5 VOLT SUPPLY - PCM OUTPUT
The PCM supplies 5 volts to the following sensors:
• A/C pressure transducer
• Ambient Temperature sensor
• Battery temperature
• Camshaft Position Sensor (NGC)
• Crankshaft Position Sensor (NGC)
• Engine coolant temperature sensor
• Inlet Air Temperature Sensor
• Knock sensor
• Linear EGR solenoid (if equipped)
• Manifold absolute pressure sensor
• Oil Pressure Switch
• Throttle position sensor
8E - 18
ELECTRONIC CONTROL MODULES
RS
POWERTRAIN CONTROL MODULE (Continued)
STANDARD PROCEDURE
STANDARD PROCEDURE - OBTAINING
DIAGNOSTIC TROUBLE CODES
BULB CHECK
Key on: Bulb illuminated until vehicle starts, as
long as all once per trip (readiness) monitors com-
pleted. If monitors have not been completed, then:
Key on: bulb check for about 5 to 8 seconds, lamp
then flashes if once per trip (readiness) monitors
have not been completed until vehicle is started,
then MIL is extinguished.
OBTAINING DTC’S USING SCAN TOOL
(1) Connect the scan tool to the data link (diagnos-
tic) connector. This connector is located in the pas-
senger compartment; at the lower edge of instrument
panel; near the steering column.
(2) Turn the ignition switch on and access the
“Read Fault” screen.
(3) Record all the DTC’s and “freeze frame” infor-
mation shown on the scan tool.
(4) To erase DTC’s, use the “Erase Trouble Code”
data screen on the scan tool. Do not erase any
DTC’s until problems have been investigated
and repairs have been performed.
STANDARD PROCEDURE - PINION FACTOR
SETTING
NOTE: This procedure must be performed if the
PCM has been replaced with a NEW or replacement
unit. Failure to perform this procedure will result in
an inoperative or improperly calibrated speedome-
ter.
The vehicle speed readings for the speedometer are
taken from the output speed sensor. The PCM must
be calibrated to the different combinations of equip-
ment (final drive and tires) available. Pinion Factor
allows the technician to set the Powertrain Control
Module initial setting so that the speedometer read-
ings will be correct. To properly read and/or reset the
Pinion Factor, it is necessary to use a scan tool.
(1) Plug the scan tool into the diagnostic connector
located under the instrument panel.
(2) Select the Transmission menu.
(3) Select the Miscellaneous menu.
(4) Select Pinion Factor. Then follow the instruc-
tions on the scan tool screen.
STANDARD PROCEDURE - QUICK LEARN
PROCEDURE
The quick learn procedure requires the use of the
DRBIII
t scan tool. This program allows the PCM to
recalibrate itself. This will provide the best possible
transaxle operation.
NOTE: The quick learn procedure should be per-
formed if any of the following procedures are per-
formed:
• Transaxle Assembly Replacement
• Powertrain Control Module Replacement
• Solenoid/Pressure Switch Assembly Replacement
• Clutch Plate and/or Seal Replacement
• Valve Body Replacement or Recondition
To perform the Quick Learn Procedure, the follow-
ing conditions must be met:
• The brakes must be applied
• The engine speed must be above 500 rpm
• The throttle angle (TPS) must be less than 3
degrees
• The shift lever position must stay until
prompted to shift to overdrive
• The shift lever position must stay in overdrive
after the Shift to Overdrive prompt until the
DRBIII
t indicates the procedure is complete
• The calculated oil temperature must be above
60° and below 200°
(1) Plug the DRBIII
t scan tool into the diagnostic
connector. The connector is located under the instru-
ment panel.
(2) Go to the Transmission screen.
(3) Go to the Miscellaneous screen.
(4) Select Quick Learn Procedure. Follow the
instructions of the DRBIII
t to perform the Quick
Learn Procedure.
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ELECTRONIC CONTROL MODULES
8E - 19
POWERTRAIN CONTROL MODULE (Continued)
REMOVAL
REMOVAL - SBEC CONTROLLER
(1) Disconnect the negative battery cable.
(2) Remove the battery shield, refer to the Battery
section for more information.
(3) Remove the 2 upper PCM bracket bolts (Fig.
19).
(4) Remove the 2 PCM connectors.
(5) Remove the headlamp, refer to the Lamps sec-
tion for more information.
(6) Remove the lower PCM mounting bolt (Fig. 20).
(7) Remove PCM.
REMOVAL - NGC CONTROLLER
The PCM engine control strategy prevents reduced
idle speeds until after the engine operates for 320 km
(200 miles). If the PCM is replaced after 320 km (200
miles) of usage, update the mileage and vehicle iden-
tification number (VIN) in the new PCM. Use the
DRBIII
t scan tool to change the millage and VIN in
the PCM. If this step is not done a Diagnostic Trou-
ble Code (DTC) may be set. Refer to the appropriate
Powertrain Diagnostic Manual and the DRBIII
t scan
tool.
Fig. 19 PCM
1 - Attaching Bolts
Fig. 20 PCM LOWER BOLT
NGC CONTROLLER LOCATION
8E - 20
ELECTRONIC CONTROL MODULES
RS
POWERTRAIN CONTROL MODULE (Continued)
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