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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 117 (Engine Controls - Self-Diagnostics - 3.0L) >> Diagnostic Tests >> DTC P0480: Cooling Fan Control Relay Circuit No. 1 >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Allow ECT to drop at least below 176°F (80°C). Turn ignition off for 10 seconds. Turn A/C button off on console. Start engine. Using scan tool, monitor status of DTC P0480. If DTC P0480 has run and failed LAST TEST, go to next step. If DTC P0480 has not run and failed LAST TEST, problem is intermittent. See DIAGNOSTIC AIDS  .
  2. Check COOL-HI fuse (40-amp) or COOL FAN 1 fuse (40-amp) in underhood fuse block. Replace and retest if open. Turn ignition off. Replace cooling fan relay 1 with wiper relay or a known-good relay. Start engine. Using scan tool, monitor status of DTC P0480. If DTC P0480 has run and failed LAST TEST, go to next step. If DTC P0480 has not run and failed LAST TEST, check cooling fan relay 1 connector. If connector is okay, replace cooling fan relay 1.
    3. NOTE: 2.6-4.6 volts on Dark Green wire from ECM with ignition on, engine off is normal.
  3. Turn ignition on, engine off. Connect test light between relay coil battery voltage cavity and ground at underhood fuse block. See Figure . If test light is on, check Dark Green wire for open between underhood fuse block and ECM. If wire is okay, replace ECM. If test light is off, replace underhood fuse block.
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