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 MANUALSCHEVROLET1987STEP VAN P20, 6.2 J, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISCCC TBI TESTS W/CODESDIAGNOSTIC CHARTSCODE 45 - RICH EXHAUST INDICATION ("SCAN" DIAGNOSTICS)TEST DESCRIPTION
1987 Chevrolet Step Van P20, 6.2 J, Standard
Test Description
1987 Chevrolet Step Van P20, 6.2 J, StandardSECTION Test Description
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- Code 45 is set when the O2 signal on circuit No. 412 remains above .7 volts for 50 seconds, the system is operating in "Closed Loop", time since engine start has been one minute or longer, and throttle angle is greater than 2% (about .2 volt above idle voltage).
RENDER: 1.0x
NO RELATED
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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.