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Home >> Oldsmobile >> 2003 >> Bravada AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.2L >> Diagnostic Tests >> DTC P1516: Commanded Vs. Actual Throttle Position Performance (TAC Module) >> Test Description

Test Description

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

  1. 8 -  The throttle valve is spring loaded in a slightly open position and should move in either direction without binding. The throttle valve should always be under spring pressure.
  2. 11 -  When ignition is turned on, the PCM operates the throttle control motor to verify the integrity of the system prior to start-up. This can be seen by the momentary flash of the test light as the ignition is turned on.