MCi Crusader II 1989 Maintenance Manual page 328

Date 1-1-89 Page
9-20
MC-9 MAINTENANCE MANUAL
TROUBLE
SYSTEM DROPS OUT OF CRUISE MODE BY
ITSELF. AND SPEED MUST BE RESET
SYSTEM INTERMITTENTLY DROPS OUT OF
CRUISE MODE BUT RESUMES ORIGINAL SPEED
OR GLOSE TO IT; DOES NOT REQUIRE MANUAL
RESETTING OF.THE SYSTEM.
SYSTEM DROPS OUT OF A SMOOTH CONTROL
AND OSCILLATES ABOVE AND BELOW SPEED
SETTING. RETURNS BY ITSELF TO SMOOTH
CONTROL MODE.
SYSTEM OSCILLATES ABOVE AND BELOW SPEED
SETTING; WILL NOT HOLD SET SPEED WITHIN
.:t. 1 MPH ON LEVEL HIGHWAY.
CAUSE
1. Shorted stop lamp switch or wiring.
2. Power to control module intermittent Inspect wiring and on/ off
switch and replace as needed.
3. Speed sensor switch defective or improperly adjusted. Switch
wiring faulty.
4. Defective CA-1 control module; replace if 1,2 or 3 are not the
cause of the trouble.
1. Set switch has internal mechanical fault - replace.
2. On standard transmission coach. clutch switch faulty or
improperly adjusted.
3. Defective control module; replace if 1 or 2 is notthe cause of
the trouble.
1. Intermittent shorting or breaking of the air cylinder potentiom-
eter wiring. Inspect for faulty wiring; replace potentiometer.
2. Defective control module or wiring. Replace module if source of
trouble was not potentiometer.
1. Speed sensor defective or improperly adjusted. Test sensor
output as described in 9 above.
2. Air cylinder improperly installed. Check the travel of the throttle
cable in relation to the full travel of the engine throttle. The air
cylinder should increase engine rpm from idle to governed rpm
in not less than 1'/4" (31 mm).
3. Air cylinder potentiometer or associated wiring defective. Visu-
ally inspect for broken or damaged wiring. Disconnect connec-
tor number 3 and check the resistance between the sockets and
terminals. Resistance values are shown in f,6. above. If these
readings are not obtained, replace the air cylinder poten-
tiometer.
4. Faulty control module. If the cause of the trouble was not iso-
lated in the previous tests, replace the control module.