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Home >> Saturn >> 1998 >> SC2 Automatic, MP6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1620 - Low Coolant Level Circuit >> Diagnostic Procedures
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Diagnostic Procedures

  1. Ensure coolant level is okay, add if necessary. Check coolant level reading using scan tool. If scan tool indicates that coolant level is okay, problem is intermittent. See DIAGNOSTIC AIDS. If scan tool indicates that coolant level is low, go to next step.
  2. Check if back-up lights are operating properly. If back-up lights illuminate, go to next step. If back-up lights does not illuminate, check back-up light or fuse. Replace as necessary. If fuse is faulty, check for short in circuit. If fuse is okay, check for open in circuit.
  3. Remove coolant recovery tank. Disconnect coolant level switch. Using a jumper wire, jumper coolant level switch terminals together. Observe status on scan tool. If scan tool indicates low coolant, go to next step. If scan tool does not indicate low coolant, replace coolant level switch.
  4. Disconnect jumper wire. Using test light connected to ground, probe low coolant level switch harness connector terminal "B". If test light illuminates, go to next step. If test light does not illuminate, repair open in circuit to switch.
  5. Using test light connected to battery voltage, probe low coolant switch terminal "A". If test light illuminates, repair short to ground in circuit. If test light does not illuminate, check for open in circuit.
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