Corrections to Pages 6E1-C16-3, 4, 5, 6, 7

DRIVEABILITY AND EMISSIONS 1.5L (VIN 7) 6E1-C16-3

FIGURE C16-5 - ALTITUDE SOLENOID OPERATIONAL CHECK:

DIAGNOSIS

RESULTS OF INCORRECT OPERATION

^ Stalling
^ Rough idle
^ Black smoke from exhaust

vInspect

^ For cracked hoses or restrictions

vRemove or Disconnect

1. All three hoses from the Altitude Solenoid Valve. (Figure C16-5)
2. Blow into Hose "A" and, 3. Apply 12 volts to the Altitude Solenoid connectors.
4. Check for air flow out of all three hoses (indicating properly opening valve).
5. Remove voltage, valve should close. Replace any valves that do not operate as indicated with proper voltage applied.
6. See CHART C-16A & 16B on following pages, for additional diagnosis of High Altitude Emissions Control System problems.
ON-CAR SERVICE

Replace all cracked or deformed hoses. Be sure to use Hose Routing Diagram, Figure A-5, in Section "A".



CHART C-16A

HIGH ALTITUDE EMISSION CONTROL SYSTEM (ALTITUDE SWITCH CIRCUIT CHECK)

Circuit Description: 1.5L (VIN 7) "R" CARLINE (CARB) At high altitudes (above 4000 ft.) the Altitude Sensing Switch will close the circuits between the battery and the Altitude Mixture Bypass Solenoid and the Altitude Solenoid. The Altitude Solenoid Valve will open the passage between the air cleaner and the carburetor. At this time the Mixture Bypass Solenoid Valve will be activated and will open the port for additional air/fuel mixture to stabilize RPM. The Altitude Switch is:
^ Closed at high altitude and, ^ Open at low altitude.

CHART C-16A:

Test Description: Numbers below refer to circled numbers on the diagnostic chart.
1. Determines whether Altitude Switch is functioning normally.
2. Determines if Altitude Switch circuit is open or grounded or if ECM is faulty.
3. Looks for faulty Altitude Solenoid circuit or Altitude Solenoid, or B + on ECM terminal "18".
Diagnostic Aids:

If High Altitude circuit malfunctions at very high altitude, Code 45 may be stored.
^ If engine operation is badly affected, carburetor passages may be plugged. See Section "6C".






CHART C-16B

HIGH ALTITUDE EMISSION CONTROL SYSTEM (ALTITUDE SWITCH CIRCUIT CHECK)

Circuit Description: 1.5L (VIN 7) "R" CARLINE (CARB) At high altitudes (above 4000 ft.) the Altitude Sensing Switch will close the circuits between the battery and the Altitude Mixture Bypass Solenoid and the Altitude Solenoid. The Altitude Solenoid Valve will open the passage between the air cleaner and the carburetor. At this time the Mixture Bypass Solenoid Valve will be activated and will open the port for additional air/fuel mixture to stabilize RPM. The Altitude Switch is:
^ Closed at high altitude and, ^ Open at low altitude.



Diagnostic Aids:

If High Altitude circuit malfunctions at very high altitude, Code 45 may be stored.
^ If engine operation is badly affected, carburetor passages may be plugged. See Section "6C".