Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1982CAVALIER L4-112 1.8LREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSA/C - PUREGUARD 2 OPERATING ALERTPUREGUARD 2 ERROR CODES
1982 Chevrolet Cavalier L4-112 1.8L
Pureguard 2 Error Codes
1982 Chevrolet Cavalier L4-112 1.8LSECTION Pureguard 2 Error Codes
^ Code 1
Indicates the sensors inside the PureGuard 2 are not properly stabilized. This error code can be caused by high levels of electrical interference, sudden changes in pressure or temperature, or component failure. The error may self-clear by turning the tester off and on. If this does not clear the error, internal parts may require service.
^ Code 2
Indicates one or more of the sensors are outputting voltage outside of the calibration range. This error code can be caused by a sudden change in ambient temperature or operation of the PureGuard 2 out of the temperature range of 32 - 120°F (0 - 49°C). Allow the tester to stabilize in the desired temperature range while powered off. After turning tester on, if the error code does not clear, internal parts may require service.
^ Code 3 (with no red in top panel filter)
Indicates one or more of the sensors did not reach the correct sensitivity level during calibration. This error code can be caused by a sudden change in ambient temperature, poor airflow to the sensors or contaminated calibration air at the sensors. Verify the surrounding air in the area is not contaminated by refrigerant vapors or gas fumes (hydrocarbons). Ventilate the area to bring in fresh air. Inspect the tester's air intake port to verify no obstructions or clogging exist. Power the tester and verify flow out the exhaust port during calibration. The exhaust port is a 1/16 in. (1.5 mm) hole located on the left side of the tester. After turning tester on, if the error code does not clear, internal parts may require service.
^ InfoCode 3 (with red in top panel filter)
Indicates oil or liquid refrigerant was charged into the vehicle and has contaminated the filter and the sensors in the PureGuard 2. The tester is damaged and must be serviced or replaced.
Indicates the sensors inside the PureGuard 2 are not properly stabilized. This error code can be caused by high levels of electrical interference, sudden changes in pressure or temperature, or component failure. The error may self-clear by turning the tester off and on. If this does not clear the error, internal parts may require service.
^ Code 2
Indicates one or more of the sensors are outputting voltage outside of the calibration range. This error code can be caused by a sudden change in ambient temperature or operation of the PureGuard 2 out of the temperature range of 32 - 120°F (0 - 49°C). Allow the tester to stabilize in the desired temperature range while powered off. After turning tester on, if the error code does not clear, internal parts may require service.
^ Code 3 (with no red in top panel filter)
Indicates one or more of the sensors did not reach the correct sensitivity level during calibration. This error code can be caused by a sudden change in ambient temperature, poor airflow to the sensors or contaminated calibration air at the sensors. Verify the surrounding air in the area is not contaminated by refrigerant vapors or gas fumes (hydrocarbons). Ventilate the area to bring in fresh air. Inspect the tester's air intake port to verify no obstructions or clogging exist. Power the tester and verify flow out the exhaust port during calibration. The exhaust port is a 1/16 in. (1.5 mm) hole located on the left side of the tester. After turning tester on, if the error code does not clear, internal parts may require service.
^ InfoCode 3 (with red in top panel filter)
Indicates oil or liquid refrigerant was charged into the vehicle and has contaminated the filter and the sensors in the PureGuard 2. The tester is damaged and must be serviced or replaced.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.