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.
2002 Pontiac Aztek AWDFACTORY OEM SERVICE PROCEDURE
On-Board Diagnostics: Monitors
- Comprehensive Component Monitor
Monitors PCM systems for opens, shorts grounds and out-of-range sensors. Also monitors rationality of sensors. Rationality is whether the sensor value is consistent with the operating conditions of the other sensors. - Misfire Monitor
Monitors engine misfire using crankshaft sensor to determine location and severity of misfire. A catalyst damaging misfire will flash the MIL, and a non-catalyst damaging misfire is a normal type "B" code. - Fuel Trim Monitor
Monitors short and long term fuel trim for being at maximum lean or rich limit. - Oxygen Sensor Monitor
Monitors all oxygen sensors for maximum voltage level, minimum voltage level and lean-rich/rich-lean switching rate. - Oxygen Sensor Heater Monitor
Monitors oxygen sensor heater by watching sensor's time-to-activity after a cold start. - Catalyst Monitor
Monitors catalyst efficiency by comparing activity rate of precatalyst oxygen sensor and postcatalyst oxygen sensor. - EGR Monitor
Monitors operation and flow rate of EGR system. - EVAP Monitor
Monitors EVAP system for large leaks, small leaks and purge flow. - Secondary Air Monitor
Monitors secondary air operation.
Factory Service Tools
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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.
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