F 100 2WD Pickup V8-255 4.2L (1982)
Cruise Control Module: Testing and Inspection
Use only a multi-meter of 5000 ohm/volt rating or higher when performing amplifier test.
``On'' Circuit Test
1.
Turn ignition ``On.''
2.
Connect a voltmeter between light blue wire w/black hash and ground on models exc. 1983-87 Ranger, 1984-87 Bronco II and 1986-87 Aerostar
or white wire w/purple stripe and ground on 1983-87 Ranger, 1984-87 Bronco II and 1986-87 Aerostar.
3.
Battery voltage should be indicated when ``On'' switch on steering column is depressed and held. If battery voltage is not indicated, check horn
relay and perform control switch test.
4.
Release ``On'' button. Voltmeter should indicate 7.8 volts indicating ``On'' circuit is engaged. If voltage does not remain, check amplifier ground,
fuses or circuit breakers or replace amplifier with known good amplifier and repeat test.
5.
Replace as necessary.
``Off'' Circuit Test
1.
Turn ignition ``On.''
2.
Connect a voltmeter between light blue wire w/black hash and ground.
3.
Depress ``Off'' button. Voltage should drop to zero indicating ``On'' circuit is de-energized.
4.
If voltage does not drop to zero, perform ``Control Switch Test.''
``Set-Accelerate'' Circuit Test
1.
Turn ignition ``On.''
2.
Connect a voltmeter between light blue wire w/black hash and ground.
3.
Depress ``On'' switch, then hold ``Set-Accel'' button on steering wheel. Voltmeter should indicate 4.5 volts. Rotate steering wheel back and forth
and check for voltmeter fluctuations. If reading varies more than .5 volts, perform ``Control Switch Test.''
``Coast'' Circuit Test
1.
Turn ignition ``On.''
2.
Connect a voltmeter between light blue wire w/black hash and ground.
3.
Depress ``On'' switch, then depress and hold ``Coast'' button on steering wheel. Voltmeter should indicate 1.5 volts. Rotate steering wheel back
and forth and check for voltage fluctuations. If reading varies more than .5 volts, perform ``Control Switch Test.''
``Resume'' Circuit Test
1.
Turn ignition ``On.''
2.
Connect a voltmeter between light blue wire w/black hash and ground.
3.
Depress and hold ``Resume'' button. Voltmeter should indicate 6.5 volts.
If all circuits are functioning properly, perform ``Servo Assembly
Test'' using a known good amplifier. Do not replace amplifier before performing servo test.
