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 MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 2 (ENGINE CONTROLS - TESTS W/CODES - 5.7L)DIAGNOSTIC TROUBLE CODESDTC P1509 - IDLE AIR CONTROL SYSTEM HIGH RPMPASSIVE TEST
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
Passive Test
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Passive Test
WARNING: This page is about a different variant/trim than selected.
- No ECT, MAP, TP or VSS sensor DTCs are set.
- ECT greater than 162°F (72°C).
- IAT greater than -13°F (-25°C).
- BARO greater than 70 kPa (less than 10,300 ft.).
- Vehicle speed is less than 2 MPH.
- System voltage is greater than 10 volts but less than 18 volts.
- Engine run time is greater than 30 seconds.
- Throttle position is less than one percent.
- Conditions are met for greater than 3 seconds.
- Change in calculated airflow is greater than 2 counts.
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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.