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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 141 (Engine Controls Self-Diagnostics - 5.7L - Bi-Fuel) >> Diagnostic Tests >> DTC P0121: TP Sensor Angle Out Of Range >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic procedures.

  1. 5

    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.

  2. 6

    This step isolates the signal circuit from the other possible causes of the DTC condition.

  3. 7

    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.

  4. 8

    This step determines if the signal circuit is shorted to voltage or open.

  5. 9

    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.

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