Dodge ram truck 3500 1996 Service Manual page 640

8W - 30 - 6 8W - 30 FUEL/IGNITION SYSTEMS BR
DESCRIPTION AND OPERATION
( C o n t i n u e d )
Circuit K38 provides ground for injector number
five. The K38 circuit connects to cavity B6 of the
PCM.
Circuit K58 provides ground for injector number
six. The K58 circuit connects to cavity B12 of the
PCM.
Circuit K26 provides ground for injector number
seven. The K26 circuit connects to cavity B2 of the
PCM.
Circuit K28 provides ground for injector number
eight. The K28 circuit connects to cavity B13 of the
PCM.
Circuit K115 provides ground for injector nine. The
K115 circuit connects to cavity B3 of the PCM.
Circuit K116 provides ground for injector ten. The
K116 circuit connects to cavity B14 of the PCM.
IGNITION COIL—V-6 AND V-8 ENGINES
When the Automatic Shut Down (ASD) relay con­
tacts close, they connect circuits A16 and A142. Cir­
cuit A142 splices to supply voltage to the ignition
coil. The Powertrain Control Module (PCM) controls
the ground path for the ignition coil on circuit K19.
Circuit K19 connects to cavity A7 of the PCM.
HELPFUL INFORMATION
Circuit A142 splices to supply voltage to the fuel
injectors, PCM, generator, and heated oxygen sen­
sors.
IGNITION COIL—V-10 ENGINES
V-10 engines use two ignition coil packs. One coil
pack supplies spark to cylinders 5, 8, 9, and 10. The
other coil pack connects to cylinders 1, 2, 3, 4, 6, and
7.
When the Powertrain Control Module (PCM)
grounds the Automatic Shut Down (ASD) relay, the
contacts close and connect circuits A16 and A142.
Circuit A142 supplies battery voltage to the ignition
coil packs. The PCM provides ground for each indi­
vidual coil.
The PCM controls the ground path for the coil that
supplies spark to cylinders 1 and 6 on circuit K19.
Circuit K19 connects to cavity A7 of the PCM.
The PCM controls the ground path for the coil that
supplies spark to cylinders 2 and 3 on circuit K43.
Circuit K43 connects to cavity A5 of the PCM.
The PCM controls the ground path for the coil that
supplies spark to cylinders 8 and 9 on circuit K18.
Circuit K18 connects to cavity A3 of the PCM.
The PCM controls the ground path for the coil that
supplies spark to cylinders 4 and 7 on circuit K32.
Circuit K32 connects to cavity A l of the PCM.
The PCM controls the ground path for the coil that
supplies spark to cylinders 5 and 10 on circuit K17.
Circuit K17 connects to cavity A9 of the PCM
IDLE AIR CONTROL MOTOR
The Powertrain Control Module (PCM) operates
the Idle Air Control motor through four circuits; K39,
K40, K59, and K60. Each circuit connects to separate
cavities in the PCM connector.
• Circuit K39 connects to cavity A19 of the PCM
connector.
• Circuit K40 connects to cavity A l l of the PCM
connector.
• Circuit K59 connects to cavity A20 of the PCM
connector.
• Circuit K60 connects to cavity A10 of the PCM
connector.
DUTY CYCLE EVAP/PURGE SOLENOID
The Powertrain Control Module (PCM) operates
the EVAP/Purge solenoid by providing a ground path
on circuit K52. Circuit K52 connects to PCM cavity
C20. Circuit F18 supplies battery voltage to the
EVAP/Purge solenoid.
HELPFUL INFORMATION
• I n the RUN or START position, the ignition
switch connects circuit A l from the Power Distribu­
tion Center (PDC) and circuit A21. Circuit A21 feeds
circuit F18 through fuse 9 in the fuse block.
• Circuit F18 splices to supply battery voltage to
the EGR solenoid and connects to cavity A2 of the
PCM.
EGR SOLENOID
The Powertrain Control Module (PCM) operates
the EGR solenoid by providing a ground path on cir­
cuit K35. Circuit K35 connects to PCM cavity B32.
Circuit F18 supplies battery voltage to the EGR sole­
noid.
HELPFUL INFORMATION
In the RUN or START position, the ignition switch
connects circuit A l from the Power Distribution Cen­
ter (PDC) to circuit A21. Circuit A21 feeds circuit F18
through fuse 9 in the fuse block.
Circuit F18 splices to supply battery voltage to the
EVAP/Purge solenoid and connects to cavity A2 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 C17 of the PCM. Circuit F14
provides voltage for the lamp. The M I L displays the
message CHECK ENGINE when illuminated.
For information regarding diagnostic trouble code
access using the M I L lamp, refer to Group 14, Fuel
Systems.