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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 112 (Engine Controls - Self-Diagnostics - 3.0L) >> Diagnostic Tests >> DTC P2138: App Sensor Correlation >> DTC Parameters

DTC Parameters

WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

DTC sets if APP sensor 2 are does not change by more than 40 mV from when APP sensor 1 transitioned from under 1.27 volts to over 1.27 volts when stored APP sensor 1 reading below 1.27 volts was present for longer than 100 ms and the stored APP sensor 1 reading above 1.27 volts was present for longer than 100 ms, main relay voltage is greater than 7.0 volts, and ignition is on; or DTC sets if the difference between APP sensor 1 and APP sensor 2 are greater than 0.21 volts for low throttle, greater that 0.27 volts for part throttle or greater than 1.05 volts for full throttle for longer than 160 ms when neither APP sensor value has been substituted.

NOTE: The MIL will only illuminate if the fault is present for longer than 5 seconds.