Dodge Ram Truck 1500-2500-3500. Manual — part 1484
REMOVAL
REMOVAL/INSTALLATION
The cascade overflow valve is not serviced separately.
SENSOR-WATER IN FUEL
DESCRIPTION
The Water-In-Fuel (WIF) sensor (5) is located on the
side of the fuel filter/water separator canister.
OPERATION
The sensor sends an input to the Engine Control Module (ECM) when it senses water in the fuel filter/water sep-
arator. As the water level in the filter/separator increases, the resistance across the WIF sensor decreases. This
decrease in resistance is sent as a signal to the ECM and compared to a high water standard value. Once the value
reaches 30 to 40 kilohms, the ECM will activate the water-in-fuel warning lamp through CCD bus circuits. This all
takes place when the ignition key is initially put in the ON position. The ECM continues to monitor the input while
the engine is running.
REMOVAL
The Water-In-Fuel (WIF) sensor is located at the side of fuel filter/water separator canister. Refer to Fuel Filter/
Water Separator Removal/Installation for WIF sensor removal/installation procedures.
CIRCUIT - FUEL DRAIN
OPERATION
The Fuel Drain Circuit incorporates several sources of fuel return. Fuel travels from the fuel tank (via the fuel trans-
fer pump) and is forced through the fuel filter. This fuel then travels into the fuel injection pump. It then goes to a
fuel drain line and returns back to the fuel tank.
The fuel that flows to the fuel pump is pressurized by a gear pump and internally transferred to the fuel injection
pump. At this point the fuel is channeled into two passages. One passage sends fuel to the FCA (Fuel Control
Actuator). The other passage sends fuel to the cascade overflow valve. The overflow valve sends some fuel to a
lubrication passage. The rest of the fuel is sent to a drain passage which connects to an external fuel line.
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FUEL DELIVERY - DIESEL
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Fuel that travels through the FCA is pressurized by the fuel injection pump and sent through an external high pres-
sure fuel line to the fuel rail. At the fuel rail, fuel is sent to the fuel injectors. If fuel pressure in the fuel rail becomes
excessive, the pressure limiting valve opens and sends fuel through an external fuel line.
At the fuel injector, fuel that is not injected is used for lubrication of the fuel injectors. This fuel then travels through
an internal passage that is connected to the rear of the cylinder head, an then into an external fuel line. This line is
connected to the vehicles fuel return line, and returns excess fuel back into the fuel tank.
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FUEL INJECTION - DIESEL
TABLE OF CONTENTS
page
page
SENSOR-ACCELERATOR PEDAL POSITION
. . . . . . . . . . . . . . . . . . . . . . . . 127
. . . . . . . . . . . . . . . . . . . . . . . . . . 127
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
. . . . . . . . . . . . . . . . . . . . . . . . 128
SENSOR-CAMSHAFT POSITION
. . . . . . . . . . . . . . . . . . . . . . . . 128
. . . . . . . . . . . . . . . . . . . . . . . . . . 128
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
. . . . . . . . . . . . . . . . . . . . . . . . 129
SENSOR-CRANKSHAFT POSITION
. . . . . . . . . . . . . . . . . . . . . . . . 129
. . . . . . . . . . . . . . . . . . . . . . . . . . 130
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
. . . . . . . . . . . . . . . . . . . . . . . . 131
ACTUATOR - FUEL CONTROL
. . . . . . . . . . . . . . . . . . . . . . . . 131
. . . . . . . . . . . . . . . . . . . . . . . . . . 132
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
INJECTOR - FUEL (EARLY)
. . . . . . . . . . . . . . . . . . . . . . . . 132
. . . . . . . . . . . . . . . . . . . . . . . . . . 133
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
. . . . . . . . . . . . . . . . . . . . . . . . 137
INJECTOR - FUEL (LATE)
. . . . . . . . . . . . . . . . . . . . . . . . 138
. . . . . . . . . . . . . . . . . . . . . . . . . . 139
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
. . . . . . . . . . . . . . . . . . . . . . . . 143
RAIL - FUEL INJECTOR
. . . . . . . . . . . . . . . . . . . . . . . . 144
. . . . . . . . . . . . . . . . . . . . . . . . . . 144
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
. . . . . . . . . . . . . . . . . . . . . . . . 145
SENSOR-TEMPERATURE/PRESSURE-INTAKE
. . . . . . . . . . . . . . . . . . . . . . . . 146
. . . . . . . . . . . . . . . . . . . . . . . . . . 146
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
. . . . . . . . . . . . . . . . . . . . . . . . 147
HEATER - INTAKE AIR
. . . . . . . . . . . . . . . . . . . . . . . . 148
. . . . . . . . . . . . . . . . . . . . . . . . . . 148
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
. . . . . . . . . . . . . . . . . . . . . . . . 150
RELAY - INTAKE AIR HEATER
. . . . . . . . . . . . . . . . . . . . . . . . 150
. . . . . . . . . . . . . . . . . . . . . . . . . . 151
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
. . . . . . . . . . . . . . . . . . . . . . . . 151
SENSOR-TEMPERATURE/PRESSURE-MAP
. . . . . . . . . . . . . . . . . . . . . . . . 152
. . . . . . . . . . . . . . . . . . . . . . . . . . 152
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
. . . . . . . . . . . . . . . . . . . . . . . . 153
SENSOR-MAP
. . . . . . . . . . . . . . . . . . . . . . . . 153
SWITCH - PTO
. . . . . . . . . . . . . . . . . . . . . . . . 153
. . . . . . . . . . . . . . . . . . . . . . . . . . 153
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FUEL INJECTION - DIESEL
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SENSOR-ACCELERATOR PEDAL POSITION
DESCRIPTION
The Accelerator Pedal Position Sensor (APPS) (1) is
located inside the vehicle. It is attached to the accel-
erator pedal assembly (3).
OPERATION
The Accelerator Pedal Position Sensor (APPS) provides the Engine Control Module (ECM) with two DC voltage
signals which change as the position of the accelerator pedal changes. One of the DC voltage signals will be half
the voltage of the other signal.
REMOVAL
CAUTION: Do not attempt to separate or remove the Accelerator Pedal Position Sensor (APPS) from the
accelerator pedal assembly. The APPS is replaced as an assembly along with the pedal. If sensor is
removed from pedal, its electronic calibration may be destroyed.
1. Disconnect 6–way electrical connector at top of
APPS (2).
2. Remove APPS lower mounting bolt (4) and two
mounting nuts.
3. Remove pedal and APPS assembly from vehicle.
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