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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 114 (ENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L CNG)DIAGNOSTIC TESTSDTC P0121: TP SENSOR ANGLE OUT OF RANGETEST DESCRIPTION
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Test Description
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Test Description
WARNING: This page is about a different car, the 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
The number below refer to the step number on the diagnostic procedure.
- 6
This step indicates this sensor is currently functioning correctly. If you were sent to this diagnostic procedure from other service information return to that procedure now. - 7
This step isolates the signal circuit from the other possible causes of the DTC condition. - 8
This step determines if the 5-volt reference circuit has the proper voltage. The amperage available on the 5-volt reference circuit should be about 180 mA. - 9
This step determines if the signal circuit is shorted to voltage or open. - 10
This step determines if the sensor ground circuit has good continuity. With the TP signal circuit (5 volts) grounded through the sensor ground circuit terminal, very little voltage should be available at TP signal circuit.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.