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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P0481: Cooling Fan Relays No. 2 & 3 Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
  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. If complaint is that fans are on all time, go to next step. If complaint is that fans are not on all time, go to step  4.
  3. Turn ignition off. Disconnect PCM harness connector. Turn ignition on. If fans are on, go to step  7. If fans are not on, go to step  10.
  4. Turn ignition off. Remove cooling fan relays No. 2 and 3. Connect a test light between ground and relay No. 2 coil terminal in relay harness connector. If test light illuminates, go to step  8. If test light does not illuminate, go to next step.
  5. Turn ignition off. Reinstall both relays. Disconnect PCM harness connector. Connect test light between ground and relay No. 2 and 3 control circuit at PCM connector. If test light illuminates, go to step  9. If test light does not illuminate, go to next step.
  6. Repair open circuit between PCM and splice. After repairs, go to step  11.
  7. Repair short to ground in relay No. 2 and 3 control circuit. After repairs, go to step  11.
  8. Repair short to battery voltage in relay No. 2 and 3 control circuit. After repairs, go to step  11.
  9. Check connections at PCM. Repair as necessary. After repairs, go to step  11. If connections are okay, go to next step.
  10. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  11. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. 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.
  12. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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