Dodge ram truck 3500 1996 Service Manual page 638

8W - 3 0 - 4
8W - 31 FUEL/IGNITION
SYSTEMS
BR
D E S C R I P T I O N A N D O P E R A T I O N ( C o n t i n u e d )
• Intake air temperature sensor
• Throttle position sensor
• Manifold absolute pressure sensor
• Engine coolant temperature sensor
• Vehicle speed sensor
CAMSHAFT POSITION SENSOR
The Powertrain Control Module (PCM) supplies 5
volts to the camshaft position sensor on circuit K6.
Circuit KB connects to cavity A17 of the PCM.
The PCM receives the camshaft position sensor sig­
nal on circuit K44. Circuit K44 connects to cavity
A18 of the PCM.
The PCM provides a ground for the camshaft posi­
tion sensor (circuit K44) through circuit K4. Circuit
K4 connects to cavity A4 of the PCM connector.
HELPFUL INFORMATION
• Circuit K 6 splices to supply 5 volts to the crank­
shaft position sensor.
Circuit K4 splices to supply ground for the signals
from the following:
• Heated oxygen sensors
» Crankshaft position sensor
• Intake air temperature sensor
• Throttle position sensor
• Manifold absolute pressure sensor
• Engine coolant temperature sensor
• Vehicle speed sensor
ENGINE COOLANT TEMPERATURE SENSOR
The engine coolant temperature sensor provides an
input to the Powertrain Control Module (PCM) on
circuit K2. From circuit K2, the engine coolant tem­
perature sensor draws up to 5 volts from the PCM.
The sensor is a variable resistor. As engine coolant
temperature changes, the resistance in the sensor
changes, causing a change in current draw. The K2
circuit connects to cavity A16 of the PCM.
The PCM provides a ground for the engine coolant
temperature sensor signal (circuit K2) through circuit
K4. Circuit K4 connects to cavity A4 of the PCM.
HELPFUL INFORMATION
Circuit K4 splices to supply ground for the signals
from the following:
• Heated oxygen sensors
• Camshaft position sensor
• Crankshaft position sensor
• Intake air temperature sensor
• Throttle position sensor
• Manifold absolute pressure sensor
• Vehicle speed sensor
THROTTLE POSITION SENSOR
From the Powertrain Control Module (PCM), cir­
cuit K6 supplies 5 volts to the Throttle Position Sen­
sor (TPS). Circuit K6 connects to cavity A17 of the
PCM.
Circuit K22 delivers the TPS signal to the PCM.
Circuit K22 connects to cavity A23 of the PCM.
The PCM provides a ground for the TPS signal
(circuit K22) through circuit K4. Circuit K4 connects
to cavity A4 of the PCM.
HELPFUL INFORMATION
Refer to Group 14 for TPS operation.
Circuit K6 splices to supply 5 volts to the manifold
absolute pressure sensor, crankshaft position sensor
and camshaft position sensor.
Circuit K4 splices to supply ground for the signals
from the following:
• Heated oxygen sensors
• Camshaft position sensor
• Crankshaft position sensor
• Intake air temperature sensor
• Manifold absolute pressure sensor
• Engine coolant temperature sensor
• Vehicle speed sensor
THROTTLE POSITION SENSOR—DIESEL ENGINE
From the Powertrain Control Module (PCM), cir­
cuit K6 supplies 5 volts to the Throttle Position Sen­
sor (TPS). Circuit K6 connects to cavity A17 of the
PCM.
Circuit K22 delivers the TPS signal to the PCM.
Circuit K22 connects to cavity A23 of the PCM. Cir­
cuit K22 also splices to cavity 3 of the EGR control
module.
The PCM provides a ground for the TPS signal
(circuit K22) through circuit K4. Circuit K4 connects
to cavity A4 of the PCM.
HELPFUL INFORMATION
Refer to Group 14 for TPS operation.
Circuit K4 splices to supply ground for the signals
from the following:
• Battery Temperature Sensor
• Crankshaft Position Sensor
• Water-In-Fuel Sensor
• Vehicle speed sensor
MANIFOLD ABSOLUTE PRESSURE SENSOR
From the Powertrain Control Module (PCM), cir­
cuit K6 supplies 5 volts to the Manifold Absolute
Pressure (MAP) sensor. Circuit K6 connects to cavity
A17 of the PCM.
Circuit K l delivers the MAP signal to the PCM.
Circuit K l connects to cavity A27 of the PCM.
The PCM provides a ground for the MAP sensor
signal (circuit K l ) through circuit K4. Circuit K4 con­
nects to cavity A4 of the PCM.