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Symptom Troubleshooting Index

SYMPTOM TROUBLESHOOTING CHART

Symptom Diagnostic procedure Also check for
Excessive engine oil consumption
  1. Verify the engine oil filler cap, the oil drain bolt, and the oil filter are tight.
  2. Check for oil leaks.
  3. Check for worn valve guide(s) (see VALVE INSPECTION ) or worn valve stem seal(s) (see VALVE, SPRING, AND VALVE SEAL REMOVAL ).
  4. Check for damaged or worn piston ring(s) (see PISTON RING REPLACEMENT ).
  5. Check for damaged or worn engine internal parts (cylinder wall, pistons, etc.) (see BLOCK AND PISTON INSPECTION ).
  
Low oil pressure indicator does not come on with the ignition switch in ON (II)
  1. Do the low oil pressure indicator circuit troubleshooting (Open) (see LOW OIL PRESSURE INDICATOR CIRCUIT TROUBLESHOOTING (OPEN) ).
  2. Test the oil pressure switch (see OIL PRESSURE SWITCH TEST ).
 An open in the wire between the powertrain control module (PCM) and the oil pressure switch
Low oil pressure indicator stays on
  1. Check the engine oil level.
  2. Do the low oil pressure indicator circuit troubleshooting (Short) (see LOW OIL PRESSURE INDICATOR CIRCUIT TROUBLESHOOTING (SHORT) ).
  3. Test the oil pressure switch (see OIL PRESSURE SWITCH TEST ).
  4. Check the engine oil pressure (see OIL PRESSURE TEST ).
  5. Check the oil filter for clogging.
  6. Check the oil screen for clogging.
  7. Check the relief valve (see OIL PUMP OVERHAUL ).
  8. Test the oil pump (see INSPECTION ).
 A wire shorted to ground between the powertrain control module (PCM) and the oil pressure switch
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