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1-4 Upshift System Relay (Manual Transmission)

  1. Turn ignition off. Disconnect 2nd-3rd shift relay connector. Check for continuity between relay terminals No. 85 and No. 86. See Fig 1 . If continuity does not exist, replace relay. If continuity does exist, go to next step.
  2. Energize relay by applying battery voltage to terminal No. 85 of relay and grounding terminal No. 86. Check continuity between relay terminals No. 30 and No. 87. See Fig 1 . Continuity should exist while relay is energized. Replace relay if it does not test as described.
Fig 1: 1-4 Upshift Relay Schematic (Corvette)
G94D32261Courtesy of GENERAL MOTORS CORP.