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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P1273-P1536DTC P1416DTC P1416: AIR SYSTEM BANK 2 (5.0L & 5.7L "C" & "K" SERIES)AIR PASSIVE TEST ENABLE
1999 GMC Forward Control 5.7 R, Automatic
AIR Passive Test Enable
1999 GMC Forward Control 5.7 R, AutomaticSECTION AIR Passive Test Enable
- No ECT, EVAP, HO2S, IAC, IAT, MAF, MAP or TP sensor DTCs are set.
- No misfire DTCs are set.
- No fuel trim DTCs are set.
- System voltage greater than 10 volts for greater than 3 seconds.
- IAT greater than 32°F (0°C).
- Engine run time greater than 3 seconds.
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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.