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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 116 (Engine Controls - Self-Diagnostics - 4.0L) >> Diagnostic Tests >> DTC P0386: Crankshaft Position Sensor "B" Circuit Performance >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. 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. 2

    During normal operation, the PCM uses the Angle Mode in order to determine the engine position. In order to operate in this mode, the PCM must receive valid input from both CKP sensors. If the PCM detects a loss of the CKP "A" sensor signal, the PCM switches to a Time "B" Mode using the CKP "B" sensor input in order to determine the engine position. If the PCM detects a loss of the CKP "B" sensor, the PCM switches to a Time "A" Mode using the CKP "A" sensor input in order to determine the engine position. If the PCM detects a loss of the CKP "A" sensor signal, DTC P0335 will set. DTC P0386 will only set if a problem occurs with the CKP "B" sensor in Time "B" Mode. DTC P0335 must be diagnosed first.

  2. 6

    In order to properly verify any repair to the CKP "A" sensor harnesses and/or connectors, the system must be commanded to operate in Time "B" mode. This procedure forces the PCM to use CKP "B" sensor in order to determine engine position. If the system is functioning normally, DTC P0386 should not reset.
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