Escort L4-116 1.9L SOHC HO (1989)
Cruise Control Module: Testing and Inspection
Use only a voltmeter of 5000 ohm/volt rating or higher when performing the following amplifier test. Use of a test lamp may damage
amplifier due to excess current draw.
``On'' Circuit Test
1.
Turn ignition switch to the On position.
2.
Connect a voltmeter between white/purple (circuit 296) and ground in the amplifier six pin connector at the amplifier. Battery voltage should be
measured.
3.
If battery voltage is not measured, check fuse voltage. Repair as necessary.
4.
Connect a voltmeter to light blue/black (circuit 151) and ground at the amplifier. Voltmeter should read battery voltage when speed control switch
is in the On position, depressed and held. If voltage is not measured, refer to
CONTROL SWITCH TEST.
5.
Release On button. Voltmeter should read approximately 7.8 volts, indicating the On circuit is engaged. If voltmeter reads zero, check ground and
amplifier (either black wire on amplifier six pin connector). If there is no ground on the amplifier, check system ground wiring and connections.
Also check the number 6, 20 amp fuse and circuit breaker.
6.
If voltmeter still reads zero, substitute, but do not install a know good amplifier, then check for proper On circuit operation.
Brake Circuit Test
1.
Connect an ohmmeter between red/light green wire on the six pin connector and ground.
2.
Resistance should measure less than 5 ohms.
3.
If resistance is greater than 5 ohms, check for burned out stop lamps, improper wiring, or clutch malfunction.
Horn Relay Test (Escort, Tempo, Tracer & Topaz)
1.
Connect a voltmeter between yellow/light blue dot wire of relay and ground.
2.
Voltmeter should indicate battery voltage.
3.
If voltmeter does not indicate battery voltage, check for voltage at supply lead.
The supply lead is light blue with a white stripe on Escort and
Tracer, or dark blue on Tempo and Topaz.
4.
If voltage is indicated at supply lead, replace the relay.
5.
If no voltage is indicated at supply lead, check fuse and wiring for an open or short and repair or replace as necessary.
Off Circuit Test
1.
Turn ignition switch to the Run position.
2.
Connect a voltmeter to the light blue/black wire (circuit 151), depress Off switch on steering wheel, then read voltage.
3.
Voltage should drop to zero indicating On circuit is de-energized.
4.
If voltage does not drop to zero, perform
CONTROL SWITCH TEST.
5.
If switches are checked and found to be good, substitute a known good amplifier, then repeat procedure.
Set-Accelerate Circuit Test
1.
Turn ignition switch to the On position.
2.
Connect a voltmeter between the light blue/black wire (circuit 151) in the six pin connector and ground.
3.
Depress and hold Set-Acc button on steering wheel. The voltmeter should read approximately 4.5 volts.
4.
Rotate steering wheel and watch the voltmeter for fluctuations. If voltage varies more than 0.5 volts, perform
CONTROL SWITCH TEST.
Coast Circuit Test
1.
Turn ignition switch to the On position.
2.
Connect a voltmeter between light blue/black wire (circuit 151) and ground.
3.
Depress and hold Coast button on steering wheel. The voltmeter should read approximately 1.5 volts.
Resume Circuit Test
1.
Turn ignition switch to the On position.
2.
Connect a voltmeter between light blue/black wire (circuit 151) and ground.
3.
Depress and hold Resume button on steering wheel. The voltmeter should read approximately 6.5 volts.
4.
If all circuits are satisfactory, perform the
SERVO ASSEMBLY TEST. substituting a known good amplifier. Do not substitute a known good
amplifier until the servo assembly test has been successfully completed.
