SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L & 2.4LDIAGNOSTIC TESTSDTC P0481: COOLING FAN RELAY NO. 2 CONTROL CIRCUIT (2.4L "N" BODY)DIAGNOSTIC PROCEDURES
2001 Chevrolet Cavalier LS, 2.4 T

Diagnostic Procedures

2001 Chevrolet Cavalier LS, 2.4 TSECTION Diagnostic Procedures
  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK (GASOLINE)  under SELF-DIAGNOSTIC SYSTEM. After performing powertrain diagnostic system check, go to next step.
    2. NOTE: Before PCM changes speed of cooling fans, a 3-second delay will occur.
  2. Install scan tool. Turn ignition on, engine off. Using scan tool, command FANS HIGH SPEED on and off. If cooling fan S/P and cooling fan 3 relays turn on and off with each command, see DIAGNOSTIC AIDS  . If cooling fan S/P and cooling fan 3 relays turn on and off with each command, go to next step.
  3. Turn ignition off. Disconnect cooling fan 3 relay. Cooling fan relays are located in underhood fuse block. Turn ignition on, engine off. Using test light connected to ground, probe battery voltage circuit of cooling fan 3 relay. If test light is on, go to next step. If test light is off, go to step  8 .
  4. Connect test light between control circuit (Dark Blue wire) of cooling fan 3 relay and battery voltage circuit of cooling fan 3 relay. 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 on with each command, go to step  7 . If test light does not remain on with each command, go to next step.
  6. Check control circuit (Dark Blue wire) of cooling fan S/P relay and cooling fan 3 relay for short to voltage or open. If problem was found, repair as necessary. After repairs, go to step  12 . If problem was not found, go to step  9 .
  7. Check control circuit (Dark Blue wire) of cooling fan S/P relay and cooling fan 3 relay for short to ground. If problem was found, repair as necessary. After repairs, go to step  12 . If problem was not found, go to step  9 .
  8. Check battery voltage circuit of cooling fan S/P relay and cooling fan 3 relay for open or short to ground. If problem was found, repair as necessary. After repairs, go to step  12 . If problem was not found, go to step  10 .
  9. Check PCM connectors for poor connections. If problem was found, repair as necessary. After repairs, go to step  12 . If problem was not found, go to step  11 .
  10. Repair short to ground in cooling fan motor supply voltage circuit (Gray wire). After repairs, go to step  12 .
  11. Replace PCM. See POWERTRAIN CONTROL MODULE in appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to next step.
  12. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. If DTC does not reset, system is okay.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.