Dodge RAM 1500 1998 Owner's Manual page 1637

14 - 68 FUEL INJECTION - DIESEL
ACCELERATOR PEDAL POSITION SENSOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 68
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 71
CAMSHAFT POSITION SENSOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 71
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 72
CRANKSHAFT POSITION SENSOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 72
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 73
FUEL CONTROL ACTUATOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 74
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
FUEL INJECTOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 74
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 77
FUEL INJECTOR RAIL
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 78
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 78
ACCELERATOR PEDAL
POSITION SENSOR
DESCRIPTION
Engine Mounted Sensor: The APPS assembly is
located at the top-left-front of the engine. A plastic
cover is used to cover the assembly. The actual sen-
sor is located behind its mounting bracket.
Battery Tray Mounted Sensor: The Accelerator
Pedal Position Sensor (APPS) assembly is located
under the vehicle battery tray. A cable connects the
assembly to the accelerator pedal. A plastic cover
with a movable door is used to cover the assembly.
OPERATION
Engine Mounted Sensor: The Accelerator Pedal
Position Sensor (APPS) is a linear potentiometer. It
FUEL INJECTION - DIESEL
TABLE OF CONTENTS
page
INLET AIR TEMPERATURE SENSOR/
PRESSURE SENSOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 79
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 79
INTAKE AIR HEATER
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 80
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 80
INTAKE AIR HEATER RELAY
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 82
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 82
INTAKE AIR TEMPERATURE SENSOR/MAP
SENSOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 82
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 82
MAP SENSOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 83
THROTTLE CONTROL CABLE
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 84
PTO SWITCH
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 85
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
provides the Engine Control Module (ECM) with a
DC voltage signal proportional to the angle, or posi-
tion of the accelerator pedal.
Battery Tray Mounted Sensor: The APPS pro-
vides the ECM with two DC voltage signals which
change as the position of the accelerator changes.
One of the DC voltage signals will be half the voltage
of the other signal.
REMOVAL
Engine Mounted Sensor :
The APPS is serviced (replaced) as one assembly
including the lever, brackets and sensor. The APPS is
calibrated to its mounting bracket. The APPS assem-
bly is located at left-front of engine below plastic
cable/lever/linkage cover (Fig. 1).
DR
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