Dodge RAM TRUCK 1500 1995 Service Manual page 463

B R
VEHICLE SPEED CONTROL SYSTEM 8H - 9
stall and check adjustment. Refer to Group 5
Brakes for installation and adjustment procedures.
PULL RUNGER
INDEX KEY
948H-6
Fig. 3 Stop Lamp Switch
VACUUM SUPPLY TEST
(1) Disconnect vacuum hose at the servo and in­
stall a vacuum gauge in the hose.
(2) Start engine and observe gauge at idle. Vacuum
gauge should read at least ten inches of mercury.
(3) If vacuum does not meet this requirement,
check for vacuum leaks or poor engine performance.
For diesel engine models, refer to Group 5 - Brakes
for vacuum pump diagnosis.
SPEED CONTROL SERVO
(1) Check fuse 10 in fuseblock module. If OK, go to
next step. If not OK, replace fuse.
(2) Turn ignition switch to the ON position. Check
for battery voltage at fuse 10, If OK, go to next step.
If not OK, repair open circuit to ignition switch as re­
quired.
(3) Connect the negative lead of a voltmeter to a
good chassis ground near the servo. Unplug the
4-way connector going to the servo (Fig. 4). Push the
speed control switch to the ON position. Check for
battery voltage at servo harness connector cavity for
pin 2 (Fig. 5). If OK, go to next step. If not OK, see
diagnosis for Stop Lamp Switch.
(4) Connect a jumper wire between servo harness
connector cavity for pin 2 and pin 2 of the servo.
Check for battery voltage at pins 1, 3 and 4 of the
servo. If OK, go to next step. If not OK, replace the
servo.
(5) Turn ignition switch to OFF position. Check for
continuity between servo harness connector cavity for
pin 1 and a good ground. There should be continuity.
If not OK, repair open circuit to ground as required.
J948H-5
" SERVO BRACKET
SCREWS (3)
Fig. 4 Speed Control Servo
PIN 3 PIN 2
PIN 4 PIN
1
CONNECTOR SHOWN
FROM TERMINAL END
PIN 1 PIN 4
PIN 2 PIN 3
898H-5
Fig. 5 Servo Harness Connector
POWERTRAIN CONTROL MODULE
(1) Disconnect 60-way connector from the PCM, lo­
cated on the right dash panel in the engine compart­
ment (Fig. 6).
(2) Connect negative lead of voltmeter to a good
body ground near the module.