Dodge RAM TRUCK 1500 1995 Service Manual page 464

8H-10 VEHICLE SPEED CONTROL SYSTEM
B R
POWERTRAIN CONTROL
MODULE (PCM) J9414-11
Fig. & Powertrain Control Module
(3) For the following tests, the ignition switch
must be in the ON position. See Fig. 7 for controller
terminal locations. Touch the positive lead of the
voltmeter to the terminal in cavity number 33. With
the speed control switch in the OFF position, the
voltmeter should read zero volts. With the speed con­
trol switch in the ON position, the voltmeter should
read battery voltage. If not, repair the main harness
as necessary.
Fig. 7 PCM 60-Way Connector - Terminal End
(4) Touch the positive lead of the voltmeter to the
terminal in cavity number 53. As in step (3), the volt­
meter should read zero volts with the switch in the
OFF position, and battery voltage with the switch in
the ON position.
(5) Touch the positive lead of the voltmeter to the
terminal in cavity number 48. With the speed control
switch in the OFF position, the voltmeter should
read zero volts. With the switch in the ON position,
the voltmeter should read battery voltage. Pressing
the SET/COAST button should cause the voltmeter to
change from battery voltage to zero volts for as long
as the switch is held. If not, perform the Speed Con­
trol Switch Test. If the switch is not at fault, then
check the main harness and repair as necessary.
(6) Touch the positive lead of the voltmeter to the
terminal in cavity number 50. The voltmeter should
read zero volts with the speed control switch in ei­
ther the OFF or ON position. With switch in either
RESUME or SET position, the voltmeter should read
battery voltage. If not, perform the Speed Control
Switch Test. If the switch is not at fault, then check
the main harness and repair as necessary.
(7) Touch the positive lead of the voltmeter to the
terminal in cavity number 49. The voltmeter should
read zero volts with the switch in the OFF position.
With the switch in the ON position, the voltmeter
should read battery voltage. The voltmeter will con­
tinue to read battery voltage when either the SET or
RESUME switch is pressed. If not, perform the
Speed Control Switch Test. If the switch is not at
fault, then check the main harness and repair as nec­
essary.
(8) Turn ignition switch OFF. Using an ohmmeter,
connect one lead to a good body ground and touch the
other lead to the terminal in cavity number 29. With
the brake pedal released, the meter should show con­
tinuity. When the pedal is depressed, the meter
should show an open circuit.
(9) The diesel engine PCM requires a signal from
the engine speed sensor to cavity number 24. To di­
agnosis the engine speed sensor, refer to the Power-
train Diagnostic Procedures manual.