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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Controls - System/Component Tests) >> Miscellaneous ECM Controls >> Chart C-12C, Cooling Fan, No Puller Fan (3 Of 4) 3.8L

Chart C-12C, Cooling Fan, No Puller Fan (3 Of 4) 3.8L

WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 1992 Pontiac Trans Sport, 1992 Oldsmobile Silhouette, 1992 Oldsmobile Bravada, 1992 GMC Yukon, and 1992 GMC Vandura Special. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Test numbers refer to test numbers on diagnostic charts.
  1. Checks for battery voltage at relay harness connector.
  2. Jumpering cooling fan relay terminals "A" and "E" by-passes relay, causing fans to operate, if fan motors and wiring are okay.
  3. Grounding test terminals should cause PCM to ground circuit No. 335. At this point, test light should illuminate, if PCM is good and circuit No. 335 is not open.
  4. Checks for battery voltage and ground to fan motor. Test light illuminated at this point indicates a faulty fan motor connection or motor.
Fig 1: Cooling Fan Circuit Schematic (3.8L)
G92B15918Courtesy of GENERAL MOTORS CORP.
Fig 2: Cooling Fan Circuit Flow Chart, (3.8L) (3 Of 4)
G92G15921Courtesy of GENERAL MOTORS CORP.
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