195
20 08 CONTESSA
ELECTRICAL SYSTEMS - CHASSIS — 9
No Heating:
1. Verify A/C switch is turned off.
2. Verify blower switch is turned on.
3. Verify the proper engine coolant level.
4. Verify that the engine is reaching
operating temperature.
5. Verify engine coolant is reaching water
valve attached to unit.
6. Verify operation of water valve to
permit engine coolant to pass through
valve to heater core.
7. Check unit fuses.
8. Check power supply to water valve and
grounding.
9. Check wiring.
10. Engine thermostat faulty.
Blower Does Not Operate or Runs Slow:
1. Check fuses.
2. Check for loose or corroded
connection.
3. Check wiring.
4. Check to ensure ignition switch is on.
5. Check blower and select switch.
6. Motor shaft has seized.
7. Blower wheel is out of alignment.
Damper Doors DO NOT Operate:
1. Does the motorhome air tank have
pressure?
2. Is the vacuum generator being powered
and producing a vacuum?
3. Check the vacuum line entering the unit
for vacuum.
4. Check that the vacuum solenoid
mounted on unit is receiving power
from the mode switch. If operating
properly, the vacuum solenoid will feel
hot if current is engaging the solenoid.
5. Check the mode switch.
6. Check wiring.
7. Check for a pinch in the vacuum line
leading to the vacuum motor that
operates the damper door in question.
DIAGNOSTIC PLUG LOCATION
The ABS/ATC, engine and
transmission systems communicate
electronically over SAE J1939. J1587
is used to retrieve diagnostic codes
from a particular system. A diagnostic
plug is located to the left of the steering
wheel under the dash, and another
is located in the curbside rear bay.
Both diagnostic plugs have J1939 and
J1587. Power and ground for ABS/ATC
operate on J1587.
Engine Diagnostics:
The engine diagnostics will notify the operator
of deviations from the programmed limits of
the engine through the “Warning” lamp in the
dashboard. Should a system component with the
engine develop a deviation, the “Warning” lamp
will illuminate and a diagnostic code will be
logged and stored in the system memory. These
codes are accessed by a service technician using
special equipment.
060216f
Diagnostic Plug: Located in rear curbside bay
Diagnostic Plug
090304p
Diagnostic Plug: Located under dash
Diagnostic
Plug
Engine
Button
ABS
Button
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