Dodge Durango (HB). Manual — part 245
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Provides for the easy entry/exit feature.
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Provides the tilt mirrors in reverse feature
When a memory button is pressed (#1 or #2) on the memory switch, the driver door memory mirror module sends
a recall message to the memory seat module (MSM). Then the MSM will position the driver seat and adjustable
pedals to its preprogrammed location/setting. When the Remote Keyless Entry (RKE) Transmitter button is pressed,
depending on which transmitter (#1 or #2), the SKREEM (RKE Receiver) sends the recall request and FOB number
(#1 or #2) data message. This RKE transmitter function depends on if the MSM is programmed to trigger the recall
(linked FOBs).
A memory setting is saved by pressing the “set “ button, then pressing either the memory “1” or “2” button within 5
seconds of pressing the “set” button.
A memory setting is recalled by pressing either the memory “1” or “2” button, or by pressing the unlock button on
a “linked” Remote Keyless Entry (RKE) transmitter.
For driver safety, memorized settings can not be recalled if the transmission is in any position other than park or the
seat belt is latched.
A key FOB is “linked” to a memory setting by pressing the “set” button and then pressing either the memory “1” or
“2” button within 5 seconds of pressing the set button, then by pressing the “lock” button on the selected key FOB.
Easy Entry and Exit provides the driver with more room for entry or exit from the vehicle. The Easy Entry and Exit
feature is disabled when the vehicle leaves the factory. An authorized dealer can enable this feature. Operation of
the Easy Entry and Exit function is as follows:
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If the seat is in a memorized position, it will move back a predetermined distance when the driver removes the
key from the ignition switch. This new position for the seat is the Easy Exit position for that driver. The seat
may not move to an easy entry/exit position, if it is already position at or behind a predetermined point for the
seat. This limited travel avoids obstructed customer exit/entry from behind the driver’s rear door post.
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The seat will move forward to a memory position when the driver turns the vehicle’s ignition switch out of the
LOCK position.
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The tilt mirrors in reverse feature provides for tilting the sideview (outside) mirrors down a predetermined
angle, providing a better view of the ground next to the rear portion of the vehicle. The tilt mirrors in reverse
feature is disabled when the vehicle leaves the factory. An authorized dealer can enable this feature. Operation
of the tilt mirrors is as follows:
− Sideview mirrors will tilt down when the vehicle transmission is shifted into Reverse.
− Sideview mirrors will return to the original position when the vehicle transmission is shifted out of
Reverse.
ADJUSTABLE PEDALS
The pedals swing on a large arc, the radius and angle of which were selected on the basis of ergonomic studies,
that puts them in the proper position for use by the smaller driver - higher and angled upward as well as rearward.
Powered by the small electric motor driving a gear train at each pedal, adjustment is precise, quiet, and smooth
throughout the range. A paddle-type switch on the instrument panel to the left of the steering column actuates the
electric motor-driven mechanism through the memory seat module (MSM). Pushing up the paddle brings the pedals
closer and vice versa. Movement stops when the switch is released. MSM logic prevents pedal adjustment when the
automatic speed control (cruise control) is set (controlling speed), and when the transmission is in reverse. This
feature protects against a loss of reference position when neither foot is on the pedal.
DIAGNOSIS AND TESTING
MEMORY SEAT MODULE
Any diagnosis of the memory seat system/module should begin with, the use of a scan tool and the appro-
priate diagnostic service information.
Refer to the appropriate wiring information.
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ELECTRONIC CONTROL MODULES - SERVICE INFORMATION
8E - 201
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REMOVAL
1. Disconnect and isolate the battery negative cable.
2. Remove the driver seat cushion/cover (2) (Refer to
23
-
BODY/SEATS/SEAT
CUSHION/COVER
-
FRONT - REMOVAL).
3. Unsnap the memory seat module (4) from the side
brackets.
4. Pivot the module upward and disconnect the elec-
trical connectors (1).
5. Pull the module rearward to remove it from the
front of the seat frame (3).
INSTALLATION
1. Place the module (4) into position making sure the
front snaps into the seat frame (3).
2. Connect the memory seat module harness connec-
tors (1).
3. Pivot the module (4) downward and snap it into
place in the side brackets.
4. Install the driver seat cushion/cover (2) (Refer to 23
- BODY/SEATS/SEAT CUSHION COVER - FRONT
- INSTALLATION).
5. Connect the battery negative cable.
6. Verify system and vehicle operation.
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ELECTRONIC CONTROL MODULES - SERVICE INFORMATION
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MODULE-POWERTRAIN CONTROL
DESCRIPTION
DESCRIPTION
The PCM (2) is attached to the right-front inner fender
(1) located in the engine compartment.
MODES OF OPERATION
As input signals to the Powertrain Control Module (PCM) change, the PCM adjusts its response to the output
devices.
The PCM will operate in two different modes: Open Loop and Closed Loop.
During Open Loop modes, the PCM receives input signals and responds only according to preset PCM program-
ming. Input from the oxygen (O2S) sensors is not monitored during Open Loop modes.
During Closed Loop modes, the PCM will monitor the oxygen (O2S) sensors input. This input indicates to the PCM
whether or not the calculated injector pulse width results in the ideal air-fuel ratio. This ratio is 14.7 parts air-to-1
part fuel. By monitoring the exhaust oxygen content through the O2S sensor, the PCM can fine tune the injector
pulse width. This is done to achieve optimum fuel economy combined with low emission engine performance.
The fuel injection system has the following modes of operation:
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Ignition switch ON
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Engine start-up (crank)
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Engine warm-up
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Idle
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Cruise
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Acceleration
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Deceleration
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Wide open throttle (WOT)
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Ignition switch OFF
The ignition switch On, engine start-up (crank), engine warm-up, acceleration, deceleration and wide open throttle
modes are Open Loop modes. The idle and cruise modes, (with the engine at operating temperature) are Closed
Loop modes.
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ELECTRONIC CONTROL MODULES - SERVICE INFORMATION
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IGNITION SWITCH (KEY-ON) MODE
This is an Open Loop mode. When the fuel system is activated by the ignition switch, the following actions occur:
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The PCM pre-positions the idle air control (IAC) motor.
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The PCM determines atmospheric air pressure from the MAP sensor input to determine basic fuel strategy.
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The PCM monitors the engine coolant temperature sensor input. The PCM modifies fuel strategy based on this
input.
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Intake manifold air temperature sensor input is monitored.
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Throttle position sensor (TPS) is monitored.
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The auto shutdown (ASD) relay is energized by the PCM for approximately three seconds.
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The fuel pump is energized through the fuel pump relay by the PCM. The fuel pump will operate for approx-
imately three seconds unless the engine is operating or the starter motor is engaged.
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The O2S sensor heater element is energized via the ASD relay. The O2S sensor input is not used by the PCM
to calibrate air-fuel ratio during this mode of operation.
ENGINE START-UP MODE
This is an Open Loop mode. The following actions occur when the starter motor is engaged.
The PCM receives inputs from:
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Battery voltage
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Engine coolant temperature sensor
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Crankshaft position sensor
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Intake manifold air temperature sensor
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Manifold absolute pressure (MAP) sensor
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Throttle position sensor (TPS)
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Starter motor relay
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Camshaft position sensor signal
The PCM monitors the crankshaft position sensor. If the PCM does not receive a crankshaft position sensor signal
within 3 seconds of cranking the engine, it will shut down the fuel injection system.
The fuel pump is activated by the PCM through the fuel pump relay.
Voltage is applied to the fuel injectors with the ASD relay via the PCM. The PCM will then control the injection
sequence and injector pulse width by turning the ground circuit to each individual injector on and off.
The PCM determines the proper ignition timing according to input received from the crankshaft position sensor.
ENGINE WARM-UP MODE
This is an Open Loop mode. During engine warm-up, the PCM receives inputs from:
•
Battery voltage
•
Crankshaft position sensor
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Engine coolant temperature sensor
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Intake manifold air temperature sensor
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Manifold absolute pressure (MAP) sensor
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Throttle position sensor (TPS)
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Camshaft position sensor signal
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Park/neutral switch (gear indicator signal—auto. trans. only)
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Air conditioning select signal (if equipped)
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Air conditioning request signal (if equipped)
Based on these inputs the following occurs:
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Voltage is applied to the fuel injectors with the ASD relay via the PCM. The PCM will then control the injection
sequence and injector pulse width by turning the ground circuit to each individual injector on and off.
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The PCM adjusts engine idle speed through the idle air control (IAC) motor and adjusts ignition timing.
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The PCM operates the A/C compressor clutch through the clutch relay. This is done if A/C has been selected
by the vehicle operator and requested by the A/C thermostat.
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ELECTRONIC CONTROL MODULES - SERVICE INFORMATION
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