Dodge RAM TRUCK 1500 1995 Service Manual page 578

8W - 30 - 6
8W-30 FUEL/IGNITION—GASOLINE ENGINES
B R
IGNITION CONTROL MODULE—V-10 ENGINES
The Ignition Control Module (ICM) and Powertrain
Control Module (PCM) communicate on circuits K137
and K138. Circuit K137 connects to cavity 7 of the
ICM and Cavity 37 of the PCM. Circuit K138 con­
nects to cavity 8 of the ICM and Cavity 38 of the
PCM.
MALFUNCTION INDICATOR LAMP (MIL)
The PCM provides ground for the instrument clus­
ter malfunction indicator lamp on circuit G3. Circuit
G3 connects to cavity 32 of the PCM. Circuit F14
provides voltage for the lamp. The MIL displays the
message CHECK ENGINE when illuminated.
For information regarding diagnostic trouble code
access using the MIL lamp, refer to Group 14, Fuel
Systems.
TACHOMETER
The tachometer module in the instrument cluster
operates the tachometer. The Powertrain Control
Module (PCM) supplies the signal for the tachometer
on circuit G21. Circuit G21 connects to cavity 43 of
the PCM.
SERVICE REMINDER INDICATOR LAMP
The Powertrain Control Module (PCM) provides
ground for the Service Reminder Indicator (SRI)
lamp on circuit G24. Circuit G24 connects to cavity
56 of the PCM. Circuit F14 provides voltage for the
lamp. The SRI lamp displays the message MAINT
REQ'D.
DATA LINK CONNECTOR
Circuit F18 supplies battery voltage to the data
link connector. When the ignition switch is in the
START or RUN positions, it connects circuit Al from
the Power Distribution Center (PDC) with circuit
A21. Circuit A21 feeds circuit F18 through fuse 9 in
the fuse block.
Circuit D20 connects to cavity 45 of the PCM. Cir­
cuit D20 is the SCI receive circuit for the PCM.
Circuit D21 connects to cavity 25 of the PCM. Cir­
cuit D21 is the SCI transmit circuit for the PCM.
Circuit Z12 provides ground for the data link con­
nector.
HELPFUL INFORMATION
If the system loses ground for the Z12 circuits, the
vehicle will not operate.
POWER (DEVICE) GROUND
Circuit Z12 connects to cavities 11 and 12 of the
Powertrain Control Module (PCM). The Z12 circuit
provides ground for PCM internal drivers that oper­
ate high current devices like the injectors and igni­
tion coil.
Internal to the PCM, the power (device) ground cir­
cuit connects to the PCM sensor return circuit (from
circuit K4).
HELPFUL
INFORMATION
If the system loses ground for the Z12 circuits, the
vehicle will not operate.
DIAGRAM INDEX—GASOLINE ENGINE
Component
;
Page
ABS Control Module . . .8W-30-15, 24, 34
Airbag Control Module . . . . . . . . . . . . . . . . . . . . .8W-30-12
ASD Relay . . . . . . . . . . . . . . . . . . . . . . .8W-30-20, 27, 39
Camshaft Position Sensor 8W-30-16, 25, 35
Circuit Breaker (Cavity 1, Fuse Block) 8W-30-12
Crankshaft Position Sensor. 8W-30-18, 27, 37
Data Link C o n n e c t o r . . . . . . . . . . . . . . . . .8W-30-15, 24, 33
EGR Solenoid . 8W-30-17, 26, 36
Engine Coolant Temperature Sensor 8W-30-16, 25, 35
EVAP/Purge Solenoid 8W-30-17, 26, 36
Fuel Pump Relay. . . . . . . . . . . . . . . . . . . . . . . . .8W-30-48
Fuel Tank Gauge Level Sending U n i t . . . . . . . . . . . .8W-30-48
Fuse 2 (Fuse Block) . . .8W-30-12
Fuse 2 (PDC) 8W-30-10
Fuse 3 (PDC) 8W-30-10, 21, 30, 40
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, 21, 30, 40
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
Heated Oxygen Sensor(s) 8W-30-20, 27, 39
Idle Air Control Motor 8W-30-13, 22, 36
Ignition Coil(s). 8W-30-14, 23, 34
Ignition Switch . . . . . . . . . . . 8W-30-11, 12, 21, 30, 40
Injectors (3.9L) .8W-30-13, 14
Injectors (5.2L/5.9L) . . .8W-30-22, 23
Injectors (8.0L) 8W-30-31, 32
Intake Air Temperature Sensor 8W-30-16, 25, 35
Manifold Absolute Pressure (MAP) Sensor. . .8W-30-18, 27, 37
Powertrain Control Module. . . . . . . . . . . . .8W-30-13 thru 39
RWAL Control Module 8W-30-12
Throttle Position Sensor 8W-30-18, 27, 37
Vehicle Speed Sensor . 8W-30-19, 27, 38