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Home >> Saturn >> 2000 >> LS Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0480: Cooling Fan Control Relay No. 1 Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, command fan control No. 1 on and off. If cooling fans follow command, problem is intermittent. See DIAGNOSTIC AIDS . If cooling fans does not follow command, go to next step.
  3. Disconnect cooling fan control unit harness connector. Connect a test light between battery voltage and cooling fan control unit harness connector terminal "F" (Dark Green wire). Using scan tool, command fan control No. 1 on and off. Observe test light. If test light does not turn on, go to next step. If test light follows scan tool command, check for terminal tightness. Repair as necessary. If terminals are okay, replace cooling fan control unit. If test light stays on, check Dark Green wire circuit for short to ground. Repair as necessary. If circuit is okay, replace PCM.
  4. Connect test light between ground and cooling fan control unit harness connector terminal "F" (Dark Green wire). If test light illuminates, check circuit for short to voltage. Repair as necessary. If circuit is okay, replace PCM. If test light does not illuminate, check for open in circuit or terminal tightness. Repair as necessary. If circuit or terminals are okay, replace PCM.
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