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Home >> Chevrolet >> 1998 >> Malibu Base, 2.4 T >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Control System Testing & Engine Component Testing - 2.4L >> Engine Sensors & Switches >> Engine Control System Testing & Engine Component Testing - 2.4L >> Engine Coolant Level Sensor

Engine Coolant Level Sensor

  1. If powertrain OBD system check has been performed, go to next step. If powertrain OBD system check has not been performed, perform powertrain OBD system check. See POWERTRAIN OBD SYSTEM CHECK in TESTS W/CODES - 2.4L article.
  2. Retrieve DTCs. If DTCs do not exist, go to next step. If DTCs exist, perform appropriate DTC test. See TESTS W/CODES - 2.4L article.
  3. Turn ignition switch to RUN position. If coolant level light illuminates for approximately 3 seconds then turn off, go to next step. If coolant level light does not illuminate for approximately 3 seconds then turn off, go to step 5).
  4. Drain coolant from surge tank. Ensure ignition switch is in RUN position. If coolant level light does not illuminate, go to step 6). If coolant level light illuminates, go to step 20).
  5. Check coolant level in surge tank. If coolant level is not okay, go to step 8). If coolant level is okay, go to step 7).
  6. Disconnect coolant level sensor harness connector. Using a test light connected to battery voltage, probe coolant level ground circuit (Black/White wire) at coolant level sensor harness connector. If test light illuminates, go to step 9). If test light does not illuminate, go to step 10).
  7. Disconnect coolant level sensor harness connector. Ensure ignition switch is in RUN position. If coolant level light does not illuminate, go to step 17). If coolant level light illuminates, go to step 11).
  8. Fill surge tank and go to step 2).
  9. Measure voltage at coolant level sensor signal circuit (Yellow/Black wire) at coolant level sensor harness connector. If battery voltage exists, go to step 12). If battery voltage does not exist, go to step 13).
  10. Repair poor connection at or open in coolant level sensor ground circuit. After repair is complete, go to step 20).
  11. Using a test light connected to battery voltage, probe coolant level sensor signal circuit (Yellow/Black wire) at cool level sensor harness connector. If test light illuminates, go to step 14). If test light does not illuminate, go to step 15).
  12. Using a test light connected to ground, probe coolant level sensor signal circuit (Yellow/Black wire) at coolant level sensor harness connector. If test light illuminates, go to step 16). If test light does not illuminate, go to step 17).
  13. Check for poor connection at or open in coolant level sensor signal circuit. If problem does not exist, go to step 19). If problem exists, repair as necessary and go to step 20).
  14. Check for short to ground in coolant level sensor signal circuit. If problem does not exist, go to step 19). If problem exists, repair as necessary and go to step 20).
  15. Connect scan tool to data link connector. Observe coolant level on scan tool. If LOW is displayed, go to step 19). If LOW is not displayed, go to step 18).
  16. Check for short to voltage in coolant level sensor signal circuit. If problem does not exist, go to step 19). If problem exists, repair as necessary and go to step 20).
  17. Replace coolant level sensor and go to step 20).
  18. Replace or repair instrument cluster as necessary. After repairs are complete, go to step 20).
  19. Replace PCM and go to next step.
  20. Operate vehicle under conditions which original symptom was noted. If system operates properly, system is okay at this time. If system does not operate properly, go to step 2).
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