Dodge ram truck 3500 1996 Service Manual page 637

8W - 30 FUEL/IGNITION SYSTEMS
8W - 30 - 3
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 )
VEHICLE SPEED SENSOR
Circuit K7 supplies 5 volts from the Powertrain
Control Module (PCM) to the vehicle speed sensor.
The K7 circuit connects to cavity B31 of the PCM
connector.
Circuit G7 from the vehicle speed sensor provides
an input signal to the PCM. The G7 circuit connects
to cavity B27 of the PCM.
The PCM provides a ground for the vehicle speed
sensor signal (circuit G7) 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
• Throttle position sensor
• Manifold absolute pressure sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
HEATED OXYGEN SENSORS
When the Automatic Shut Down (ASD) relay con­
tacts CLOSE, they connect circuits A16 and A142.
Circuit A142 splices to supply voltage to the heated
oxygen sensors.
V-6 AND V-8 LIGHT DUTY ENGINES
Circuit K141 delivers the signal from the upstream
heated oxygen sensor to the Powertrain Control Mod­
ule (PCM). Circuit K141 connects to cavity A24 of the
PCM. Circuit K341 delivers the signal from the
downstream sensor and connects to cavity A25 of the
PCM.
The PCM provides a ground for the heated oxygen
sensor signals (circuits K141 and K341) through cir­
cuit K4. Circuit K4 connects to cavity A4 of the PCM
connector.
Circuit Z l l provides a ground for the heater circuit
in the sensors.
5.9L V-8 HEAVY DUTY ENGINE
Circuit K41 delivers the signal from the upstream
heated oxygen sensor to the Powertrain Control Mod­
ule (PCM). Circuit K41 connects to cavity A24 of the
PCM. Circuit K241 delivers the signal from the
downstream sensor and connects to cavity A26 of the
PCM.
The PCM provides a ground for the heated oxygen
sensor signals (circuits K41 and K241) through cir­
cuit K4. Circuit K4 connects to cavity A4 of the PCM
connector.
Circuit Z l l provides a ground for the heater circuit
in the sensors.
V - f O ENGINES
Vehicles with the V-10 engine built for sale in the
State of California use four heated oxygen sensors.
All other V-10 equipped vehicles use two heated oxy­
gen sensors.
Circuit K141 delivers the signal from the left
heated oxygen sensor to the Powertrain Control Mod­
ule (PCM). Circuit K141 connects to cavity A24 of the
PCM. Circuit K41 delivers the signal from the right
sensor and connects to cavity A26 of the PCM.
On California vehicles, Circuit K441 delivers the
signal from the pre-catalyst heated oxygen sensor to
the PCM. Circuit K441 connects to cavity A29 of the
PCM. Circuit K341 delivers the signal from the post
catalyst sensor and connects to cavity A25 of the
PCM. ,
The PCM provides a ground for the heated oxygen
sensor signals (circuits K41, K141, K341 and K441)
through circuit K4. Circuit K4 connects to cavity A4
of the PCM connector.
Circuit Z l l provides a ground for the heater circuit
in the sensors.
HELPFUL INFORMATION
• Along with supplying voltage to the ASD relay
contacts, circuit A14 connects to cavity A22 of the
PCM.
• Circuit A142 splices to supply voltage to the fuel
injectors and ignition coil(s).
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
CRANKSHAFT POSITION SENSOR
The Powertrain Control Module (PCM) supplies 5
volts to the crankshaft position sensor on circuit KB.
Circuit K6 connects to cavity A17 of the PCM.
The PCM receives the crankshaft position sensor
signal on circuit K24. Circuit K24 connects to cavity
A8 of the PCM.
The PCM provides a ground for the crankshaft
position sensor (circuit K24) through circuit K4. Cir­
cuit K4 connects to cavity A4 of the PCM connector.
HELPFUL INFORMATION
• Circuit KB splices to supply 5 volts to the cam­
shaft position sensor.
Circuit K4 splices to supply ground for the signals
from the following:
• Heated oxygen sensors
• Camshaft position sensor