Dodge RAM TRUCK 1500 1995 Service Manual page 581

B R
8W-30 FUEL/IGNITION—DIESEL ENGINES 8W - 30 - 9
INTAKE AIR TEMPERATURE SENSOR
The intake air temperature sensor provides an input
to the Powertrain Control Module (PCM) on circuit K21.
Circuit K21 connects to cavity 21 of the PCM.
From circuit K21, the intake air temperature sen­
sor draws voltage from the PCM. The sensor is a
variable resistor. As intake air temperature changes,
the resistance in the sensor changes, causing a
change in current draw.
The PCM provides a ground for the intake air tem­
perature sensor signal (circuit K21) through circuit
K4. Circuit K4 connects to cavity 4 of the PCM.
HELPFUL
INFORMATION
Circuit K4 splices to supply ground for the signals
from the following:
• throttle position sensor
• vehicle speed sensor
• engine speed sensor
• water-in-fuel sensor
WATER-IN-FUEL SENSOR
The water-in-fuel sensor provides an input to the
Powertrain Control Module (PCM) on circuit Kl. Cir­
cuit Kl connects to cavity 1 of the PCM.
• From circuit Kl,' the water-in-fuel sensor draws
voltage from the PCM. The sensor is a variable resis­
tor. As the amount of water in the fuel separator
changes, the resistance in the sensor changes, caus­
ing a change in current draw.
The PCM provides a ground for the water-in-fuel
sensor signal (circuit Kl) through circuit K4. Circuit
K4 connects to cavity 4 of the PCM.
HELPFUL INFORMATION
Circuit K4 splices to supply ground for signals from
the following:
• intake air temperature sensor
• vehicle speed sensor
® engine speed sensor
• throttle position sensor
VEHICLE SPEED SENSOR
Circuit K7 supplies 8 volts from the Powertrain Con­
trol Module (PCM) to the vehicle speed sensor. The K7
circuit connects to cavity 7 of the PCM connector.
Circuit G7 from the vehicle speed sensor provides
an input signal to the PCM. The G7 circuit connects
to cavity 47 of the PCM connector.
The PCM provides a ground for the vehicle speed
sensor signal (circuit G7) through circuit K4. Circuit
K4 connects to cavity 4 of the PCM connector.
HELPFUL INFORMATION
Circuit G7 splices to connect to the speedometer in
the instrument cluster.
Circuit K4 splices to supply ground for the signals
from the following:
• throttle position sensor
• water-in-fuel sensor
• engine speed sensor
• intake air temperature sensor
ENGINE SPEED SENSOR
' Circuit K7 supplies 8 volts from the Powertrain Con­
trol Module (PCM) to the engine speed sensor. The K7
circuit connects to cavity 7 of the PCM connector.
Circuit K24 from the engine speed sensor provides
an input signal to the PCM. The K24 circuit connects
to cavity 24 of the PCM connector.
The PCM provides a ground for the engine speed
sensor signal (circuit G7) through circuit K4. Circuit
K4 connects to cavity 4 of the PCM connector.
HELPFUL INFORMATION
Circuit K4 splices to supply ground for the signals
from the following:
• throttle position sensor
• water-in-fuel sensor
• engine speed sensor
• intake air temperature sensor
DIAGRAM INDEX—DIESEL ENGINE
Component Page
ABS Control Module . .8W-30-42
Airbag Control Module .8W-30-12
ASD Relay 8W-30-43
Circuit Breaker (Cavity 1, Fuse Block) 8W-30-12
Data Link Connector .8W-30-42
Fuel Heater 8W-30-45
Fuel Heater Relay . . . . 8W-30-45
Fuel Pump Relay .8W-30-48
Fuel Shut Down Relay .8W-30-45
Fuel Shut Down Solenoid .8W-30-45
Fuel Tank Gauge Level Sending Unit 8W-30-48
Fuse 2 (Fuse Block) 8W-30-12
Fuse 2 (PDC) .8W-30-10
Fuse 3 (PDC) . . . . . . . . . . . . . . . . . . .8W-30-10, 44
Fuse 5 (Fuse Block) 8W-30-10
Fuse 6 (Fuse Block) 8W-30-10
Fuse 7 (Fuse Block) . 8W-30-10
Fuse 8 (Fuse Block) .8W-30-10
Fuse 9 (Fuse Block) 8W-30-11, 44
Fuse 10 (Fuse Block) .8W-30-11
Fuse 11 (Fuse Block) 8W-30-11
Fuse 12 (Fuse Block) 8W-30-11
Fuse 14 (Fuse Block) 8W-30-12
Fuse 15 (Fuse Block) .8W-30-12
Fuse 16 (Fuse Block) 8W-30-12
Ignition Switch 8W-30-11, 12, 44
Intake Air Heater Relays . .8W-30-41
Intake Air Temperature Sensor .8W-30-46
Powertrain Control Module 8W-30-41 thru 47
RWAL Control Module . 8W-30-12
Throttle Position Sensor .8W-30-46
Water-ln-Fuel Sensor .8W-30-46