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 MANUALSPONTIAC19832000 LE, 4D SEDAN, 2.0 PREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMTBI TESTS W/CODESBASIC DIAGNOSTIC PROCEDURESFIELD SERVICE MODE CHECK DESCRIPTION
1983 Pontiac 2000 LE, 4D Sedan, 2.0 P
Field Service Mode Check Description
1983 Pontiac 2000 LE, 4D Sedan, 2.0 PSECTION Field Service Mode Check Description
- This test confirms proper operation of fuel system and verifies Closed Loop operation. Clear codes and perform this test after any repair is completed.
- When performing this check, always engage parking brake and block DRIVE wheels. Parking brake on front-wheel drive models does not hold drive wheels.
- On some engines, the oxygen sensor will cool off after only a short period of time while engine is idling. This will cause engine to go into open loop. To restore closed loop mode, run engine at part throttle several minutes and accelerate from idle to part throttle several times. See Figure .
NOTE:
Although there are many charts connected with CCC diagnosis, only 2 charts are needed to prove the system is operating properly. Normally, only 3 charts are necessary to find a problem, if one exists.
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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.