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Home >> Pontiac >> 2008 >> Grand Prix Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.8L - DTC P0385 To DTC P2108 >> DTC P0386 >> Circuit/System Testing
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Circuit/System Testing

  1. Test for less than 1 ohm of resistance on the low resolution engine speed signal circuit.
    • If greater than the specified value, test the low resolution engine speed signal circuit for an open/high resistance.
  2. Ignition OFF, inspect the CKP sensor for looseness and correct installation.
    • If the sensor is loose, inspect the sensor and the O-ring for damage, replace as necessary.
  3. Inspect the engine for the following conditions:
    • Engine oil for debris and contamination
    • Crankshaft reluctor wheel for damage
    • The timing chain, tensioner, and sprockets for wear or damage
    • If debris is found in the engine oil, inspect the internal engine components to determine the cause. Repair or replace any worn or damaged components.
  4. If the low resolution engine speed signal circuit, CKP Sensor and engine timing components test normal, replace the IC Module.
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