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Upshift Indicator Test

WARNING: This page is about a different car, the 1994 Chevrolet Lumina. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect Powertrain Control Module (PCM) White connector "B". Turn ignition switch to RUN position. Using voltmeter, measure voltage between PCM White connector terminal "B" (Tan/Black wire) and ground.
  2. If battery voltage is present, see appropriate article in ENGINE PERFORMANCE for PCM diagnosis. If battery voltage is not present, check bulb and Tan/Black wire for open circuit or short to ground. If bulb and wire are okay, replace IPC.
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