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Home › Saturn › 2000 › SW2 Automatic › Repair and Diagnosis › Engine Performance › System › Engine Control System - Testing & Engine Component Testing › Engine Sensors & Switches › Engine Coolant Level Switch › 2.2L (Cavalier & Sunfire) & 2.4L

2.2L (Cavalier & Sunfire) & 2.4L

  1. Turn ignition on, with engine off. Install scan tool and retrieve DTCs. If no DTCs are set, go to next step. If any DTCs are set, perform appropriate DTC test. See appropriate SELF-DIAGNOSTICS article.
    2. CAUTION: DO NOT remove pressure cap from surge tank while engine is at normal operating temperature.
  2. Turn ignition off and wait 10 seconds. Turn ignition on, with engine off. If coolant level indicator illuminates for about 3 seconds, and then turns off and remains off, go to next step. If coolant level indicator does not illuminate for about 3 seconds, and then turn off and remain off, go to step  4.
  3. Drain coolant from surge tank. If coolant level indicator does not illuminate, go to step  5. If coolant level indicator illuminates, go to step  19.
  4. Check coolant level in surge tank. If coolant level is not okay, go to step  7. If coolant level is okay, go to step  6.
  5. Disconnect engine coolant level switch harness connector. Using a test light connected to battery voltage, probe engine coolant level switch ground circuit (Black/White wire) at engine coolant level switch harness connector. If test light illuminates, go to step  8. If test light does not illuminate, go to step  9.
  6. Disconnect engine coolant level switch harness connector. If coolant level indicator does not illuminate, go to step  16. If coolant level indicator illuminates, go to step  10.
  7. Fill surge tank and go to step  1.
  8. Using DVOM connected to ground, probe engine coolant level switch signal circuit (Yellow/Black wire) at engine coolant level switch harness connector. If battery voltage exists, go to step  11. If battery voltage does not exist, go to step  12.
  9. Repair poor connection or open in engine coolant level switch ground circuit (Black/White wire). After repairs, go to step  19.
  10. Using a test light connected to battery voltage, probe engine coolant level switch signal circuit (Yellow/Black wire) at engine coolant level switch harness connector. If test light illuminates, go to step  13. If test light does not illuminate, go to step  14.
  11. Using a test light connected to ground, probe engine coolant level switch signal circuit (Yellow/Black wire) at engine coolant level switch harness connector. If test light illuminates, go to step  15. If test light does not illuminate, go to step  16.
  12. Check for poor connection or open in engine coolant level switch signal circuit (Yellow/Black wire). If problem does not exist, go to step  18. If problem exists, repair as necessary and go to step  19.
  13. Check for short to ground in engine coolant level switch signal circuit (Yellow/Black wire). If problem does not exist, go to step  18. If problem exists, repair as necessary and go to step  19.
  14. Install scan tool. Using scan tool, observe engine coolant level display. If scan tool displays LOW, go to step  18. If scan tool does not display LOW, go to step  17.
  15. Check for short to voltage in engine coolant level switch signal circuit (Yellow/Black wire). If problem does not exist, go to step  18. If problem exists, repair as necessary and go to step  19.
  16. Turn ignition off. Replace engine coolant level switch. After repairs, go to step  19.
  17. Turn ignition off. Replace instrument cluster. After repairs, go to step  19.
  18. Turn ignition off. Check for poor electrical connections at PCM. If connections are okay, replace PCM. After repairs, go to next step.
  19. Operate vehicle under conditions which original symptom was noted. If system operates properly, system is okay. If system does not operate properly, go to step  1.
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