Dodge RAM TRUCK 1500 1995 Service Manual page 576

8W - 30 - 4
8W-30 FUEL/IGNITION—GASOLINE ENGINES
The PCM provides a ground for the heated oxygen
sensor signals (circuit K141 and K41) through circuit
K4. Circuit K4 connects to cavity 4 of the PCM con­
nector. Circuit Z l l provides a ground for the heater
circuit in each sensor.
HELPFUL INFORMATION
Circuit A142 splices to supply voltage to the fuel
injectors, ignition coil, and heated oxygen sensor.
Circuit K4 splices to supply ground for the signals
from the following:
• Camshaft position sensor
• Crankshaft position sensor
® 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 8
volts to the camshaft position sensor (in distributor)
on circuit K7. Circuit K7 connects to cavity 7 of the
PCM.
The PCM receives the camshaft position sensor sig­
nal on circuit K44. Circuit K44 connects to cavity 44
of the PCM.
The PCM provides a ground for the camshaft posi­
tion sensor signal (circuit K44) through circuit K4.
Circuit K4 connects to cavity 4 of the PCM connector.
HELPFUL INFORMATION
• Circuit K7 splices to supply 8 volts to the crank­
shaft position sensor and the vehicle speed sensor.
• Circuit K4 splices to supply ground for the signals
from the following:
• Heated oxygen sensor(s)
• Crankshaft position sensor
® Intake air temperature sensor
• Throttle position sensor
o Manifold absolute pressure sensor
• Engine coolant temperature sensor
• Vehicle speed sensor
CRANKSHAFT POSITION SENSOR
The Powertrain Control Module (PCM) supplies 8
volts to the crankshaft position sensor on circuit K7.
Circuit K7 connects to cavity 7 of the PCM.
The PCM receives the crankshaft position sensor
signal on circuit K24. Circuit K24 connects to cavity
24 of the PCM.
The PCM provides a ground for the crankshaft po­
sition sensor (circuit K24) through circuit K4. Circuit
K4 connects to cavity 4 of the PCM connector.
HELPFUL INFORMATION
Circuit K7 splices to supply 8 volts to the camshaft
position sensor and the vehicle speed sensor.
Circuit K4 splices to supply ground for the signals
from the following:
• Heated oxygen sensor
® Camshaft 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 (ECT) sensor pro­
vides an input to the powertrain control module
(PCM) on circuit K2. From circuit K2, the engine
coolant temperature sensor draws up to 5 volts from
the PCM. The sensor is a variable resistor. As coolant
temperature changes, the resistance in the sensor
changes, causing a change in current draw. The K2
circuit connects to cavity 2 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 4 of the PCM con­
nector.
HELPFUL INFORMATION
Circuit K4 splices to supply ground for the signals
from the following:
• Heated oxygen sensor(s)
• 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 6 of the
PCM.
Circuit K22 delivers the TPS signal to the PCM.
Circuit K22 connects to cavity 22 of the PCM.
The PCM provides a ground for the throttle posi­
tion sensor signal (circuit K22) through circuit K4.
Circuit K4 connects to cavity 4 of the PCM.
HELPFUL INFORMATION
Refer to Group 14 for throttle position sensor oper­
ation.
Circuit K6 splices to supply 5 volts to the manifold
absolute pressure sensor.
Circuit K4 splices to supply ground for the signals
from the following:
• Heated oxygen sensor(s)
• Camshaft position sensor
• Crankshaft position sensor
® Intake air temperature sensor
& Manifold absolute pressure sensor