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Electronic Self-Diagnostics & Electronic Testing

NOTE: See AUTO TRANS DIAGNOSIS - HYDRA-MATIC 4L80-E CONTROLS - 1995 article or AUTO TRANS DIAGNOSIS - HYDRA-MATIC 4L80-E CONTROLS - 1996 article.
NOTE: Models with gasoline engines use Powertrain Control Module (PCM) computer. Models with Diesel engines use Transmission Control Module (TCM) computer. These computers control hydraulic line pressure, shift solenoids "A" and "B", and TCC.
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