LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P0481: Cooling Fan No. 2 & 3 Relays Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different variant/trim than selected.
  1. If powertrain diagnostic system check was performed, go to next step. If powertrain diagnostic system check was not performed, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under DIAGNOSTIC SYSTEM TESTS. After performing powertrain diagnostic system check, go to next step.
    NOTE: A 3-second delay will occur before PCM changes cooling fan speed.
  2. Locate cooling fan No. 2 and 3 relays. See Figure and Figure . Turn ignition on. Using scan tool, command fans high speed on and off. If cooling fan No. 2 and 3 relays turn on and off with each command, go to DIAGNOSTIC AIDS . If cooling fan No. 2 and 3 relays do not turn on and off with each command, go to next step.
  3. Turn ignition off. Remove cooling fan No. 3 relay from top underhood fuse block. Turn ignition on. Using test light connected to ground, probe cooling fan No. 3 relay connector terminal B8 (Orange wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  8.
  4. Connect test light between cooling fan No. 3 relay connector terminals B8 (Orange wire) and C10 (Dark blue wire). Using scan tool, command fans high speed on and off. If test light turns on and off with each command, go to step  9. If test light does not turn on and off with each command, go to next step.
  5. If test light remains illuminated with each command, go to step  7. If test light does not remain illuminated with each command, go to next step.
  6. Check for open or short to voltage in Dark Blue wire between cooling fan No. 2 relay connector terminal B4, cooling fan No. 3 relay connector terminal C10 and PCM connector C2 terminal No. 33. See Figure. Repair as necessary. After repairs, go to step  12. If circuit is okay, go to step  9.
  7. Check for short to ground in Dark Blue wire between cooling fan No. 2 relay connector terminal B4, cooling fan No. 3 relay connector terminal C10 and PCM connector C2 terminal No. 33. See Figure. Repair as necessary. After repairs, go to step  12. If circuit is okay, go to step  9.
  8. Check for open or short to ground in Orange wire between cooling fan No. 2 relay connector terminal C6, cooling fan No. 3 relay connector terminal B8 and COOL FAN fuse (10-amp) located in top underhood fuse block. Repair as necessary. After repairs, go to step  12. If circuit is okay, go to step  10.
  9. Check for poor connections at PCM. Repair as necessary. After repairs, go to step  12. If connections are okay, go to step  11.
  10. Repair open in White wire between right cooling fan motor and cooling fan No. 2 relay connector terminal B6 or cooling fan No. 3 relay connector terminal B9. If circuit is okay, repair short to ground in Red wire between cooling fan No. 2 relay connector terminal C4 and splice S169. S169 is located in headlight harness approximately 2.4" from main branch of engine harness to bottom underhood fuse block breakout. After repairs, go to step  12.
  11. Replace PCM. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. After replacing PCM, go to next step.
  12. Using scan tool, clear DTCs. Turn ignition off for at least 30 seconds. Start engine and allow it to reach normal operating temperature. Operate vehicle within conditions for setting this DTC. If DTC does not reset, system is okay. If DTC resets, go to step  2.
scientia non olet · About LEMON Manuals