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Home >> Oldsmobile >> 2000 >> Intrigue GL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0480: Cooling Fan Relay No. 1 Control 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 cooling fan relay on and off. If cooling fan relay No. 1 turns on and off, go to next step. If cooling fan relay No. 1 does not turn on and off, go to step  5.
  3. Turn ignition off. Disconnect PCM harness connector. Turn ignition on. Using DVOM in 10-amp scale, check current from cooling fan relay No. 1 control circuit in PCM connector to ground for 2 minutes. If current draw is 0.10-0.75 amp, see DIAGNOSTIC AIDS . If current draw is 0.10-0.75 amp, go to next step.
  4. Turn ignition off. Disconnect cooling fan relay. Check resistance between ground and fan relay control circuit at PCM harness connector. If resistance is infinite, go to step  11. If resistance is not infinite, go to step  9.
  5. Turn ignition off. Disconnect cooling fan relay. Connect test light between relay control terminal and battery feed terminal in relay harness connector. Turn ignition on. Using scan tool, command relay on and off. If test light turns on and off with each command, go to step  8. If test light does not turn on and off, go to next step.
  6. Connect test light between ground and relay battery feed circuit in harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  10.
  7. Turn ignition off. Reconnect cooling fan relay. Disconnect PCM harness connector. Turn ignition on. Using a fused jumper wire, connect jumper between ground and cooling fan relay control circuit at PCM connector. If relay operates, go to step  12. If relay does not operate, go to step  9.
  8. Check connections at cooling fan control relay. Repair as necessary. After repairs, go to step  14. If connections are okay, go to step  11.
  9. Repair relay control circuit. After repairs, go to step  14.
  10. Repair ignition feed circuit to relay. After repairs, go to step  14.
  11. Replace cooling fan relay. After replacing relay, go to step  14.
  12. Check for poor terminal connection at PCM harness connector. Repair as necessary. After repairs, go to step  14. If connections are okay, go to next step.
  13. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  14. Using scan tool, clear DTCs. Start and warm engine to normal operating temperature. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step  2.
  15. Using scan tool, select CAPTURED INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. If no additional DTCs are set, system is okay.
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