Colt L4-1410cc 1.4L SOHC (1984)
5.
VALVE BODY AND VACUUM MOTOR TEST
A.
Turn ignition switch "ON" and speed control switch "ON". With V.O.M., set-up to measure IGN. voltage (12V), connect the negative lead of
the V.O.M. to a good chassis ground.
B.
Disconnect the four one-way "bullet" style connectors (bullet colors - yellow, black, red, black) going to the valve body. With the ignition
switch "ON" and the OFF/ON/RESUME switch "ON", the female valve body connectors with the white/red wire should measure IGN.
voltage on the V.O.M. If not, the harness is defective or there is a loose connection.
C.
Re-connect the white/red wired connector to the valve body. Now the other three female valve body connectors should all measure IGN.
voltage with the V.O.M. If this cannot be done, the valve body is defective, replace.
D.
Disconnect the hose connection from the vacuum servo-motor to the valve body and connect the hand vacuum test pump directly to the
vacuum servo motor. CAUTION: Be sure engine is OFF before completing this test as otherwise severe engine damage may result. With the
hand test pump, apply at least 10 in. Hg. of vacuum to the servo and note that the throttle is fully applied. If this cannot be done, either servo
or mechanical throttle linkage is defective. Replace, re-adjust as necessary.
E.
Re-connect the servo hose to the valve body and connect the vacuum hand pump to the inlet side of the vacuum reservoir. Pump 10 in. Hg.
into the reservoir.
F.
With jumper wires connect the female valve body electrical connectors with black and yellow/white wires to ground. Momentarily connect
the connector with the brown wire to ground. This should cause the servo to operate and hold. Removing the ground connection from either
the black or the yellow/white wires should cause the throttle to release. Both tests should be made. If this test cannot be accomplished, the
valve body is defective. Replace. NOTE: A very slow leak-down or leak-up of the
throttle servo position over the period of 2 or 3 minutes is acceptable. Any leakage rate faster than this indicates unacceptable valve body leakage.
G.
Reconnect all valve body wires and reconnect vacuum hose to reservoir.
6.
MODULE TEST
Electronic modules very seldom cause erratic performances and should not be replaced if speed can be maintained within +/- 5 mph of the selected
speed on a level road.
A.
Control switch, brake (and clutch if applicable) safety switches, speed sensor and valve body/vacuum system should be tested prior to this
test.
B.
Set up the V.O.M. to read IGN. voltage (12V), D.C. Connect the negative lead of the V.O.M. to a good chassis ground. Connect the positive
lead to the module connector connection on pin 7.
C.
Start the car and drive at a speed of from 40 to 50 mph.
D.
Turn the speed control switch to "ON". The V.O.M. should indicate IGN. voltage.
E.
Press the speed control switch "SET" button and release. The V.O.M. should indicate from +5 volts to +9 volts and will probably fluctuate
one or two volts at a fairly rapid rate. The Speed Control System should be performing throttle control at this time to maintain the "SET"
speed satisfactorily. If not, replace the electronic module.
