Chrysler RAM TRUCK 2500 1994 Service Manual page 372

• — — — — IGNITION SYSTEMS 80 - 15
OHMMETER
M A K E OHMMETER
C O N N E C T I O N S AT
C O R R E S P O N D I N G CYLINDERS
(5/10
OR
9/8).
FRONT
O F
E N G I N E
J948D 15
Fig. 13 Checking Coil Secondary Resistance—Rear
Coils—8*01 V-10 Engine
TO B+ TERMINAL
FRONT
O F
E N G I N E
TO
CENTER-
COIL
TO
RIGHT
COIL J948D-16
Fig. 14 Checking Coil Primary Resistance—Front
Coils—8.0L V-10 Engine
For removal and installation of the ICM, refer to
the Component Removal/Installation section of this
group.
ENGINE COOLANT TEMPERATURE SENSOR TEST
To perform a complete test of this sensor and its
circuitry, refer to the DRB scan tool. Also refer to the
appropriate Powertrain Diagnostics Procedures man­
ual. To test the sensor only, refer to the following:
On the 3.9L V-6 or 5.2/5.9L V-8 engines, the sensor
is installed i n the intake manifold near the thermo­
stat housing (Fig. 18).
On the 8.0L V-10 engine, the sensor is installed i n
the thermostat housing (Fig. 19).
TO LIFT
COIL
TO RIGHT
COIL
B+
TERMINAL
FRONT
OF
ENGINE
J948D-17
Fig. 15 Checking Coil Primary Resistance—Rear
Coils—8.0L V-10 Engine
* P r i m a r y Resistance: 0 . 5 3 t o 0 . 6 5 o h m s
* * S e c o n d a r y Resistance: 1 0 . 9 t o 14 7 K o h m s
* Test across the p r i m a r y c o n n e c t o r .
Refer t o text f o r test p r o c e d u r e s .
* * Test across the i n d i v i d u a l c o i l t o w e r s .
Refer t o text f o r test p r o c e d u r e s .
J 9 4 8 D - 1 3
Fig. 16 Ignition Coil Resistance Specifications—8.0L
V-10 Engine
I G N I T I O N CONTROL
MODULE (ICM)
C O O L A N T
RESERVE/OVERFLOW
TANK
ICM M O U N T I N G
BOLTS (2)
TANK
M O U N T I N G
BOLTS (3)
J948D-21
Fig. 17 Ignition Control Module Location—8.0L V-10
Engine
(1) Disconnect wire harness connector from sensor.
On 3.9L V-6 or 5.2/5.9L V-8 engines with air
conditioning, do not pull directly on wiring harness.
Fabricate an L-shaped hook tool from a coat hanger
(approximately eight inches long). Place the hook
part of tool under the connector for removal. The con­
nector is snapped onto the sensor. I t is not equipped
with a lock type tab.