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 MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 764 (ENGINE CONTROL SYSTEM)ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTIONNOTES
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Accelerator Pedal Position (App) Sensor Inspection: Notes
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Notes
WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- Before performing the following inspection, make sure to follow the troubleshooting flowchart. (See FOREWORD .)
- Connect the WDS or equivalent to the DLC-2.
- Turn the ignition switch to ON position.
- Select APP1 and APP2 PID on the WDS or equivalent.
- Verify that the APP1 and APP2 PID is within the specification when the accelerator pedal not depressed. (See PCM INSPECTION .)
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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.