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A/T Gear Position Signal

NOTE: This signal informs the PCM when the transmission is in Park or Neutral.
  1. Turn ignition on. Observe A/T position indicator on instrument panel while selecting each gear position separately. If A/T position indicator functions properly, go to next step. If A/T position indicator does not function properly, see SHIFT INTERLOCK SYSTEM article in ACCESSORIES/SAFETY EQUIPMENT section.
  2. Turn ignition off. Disconnect gauge assembly 16-pin connector. Disconnect Transmission Control Module (TCM) 26-pin connector "A". TCM is located in passenger side footwell, next to PCM. Turn ignition on. Measure voltage between PCM connector terminal A9 and terminal C29. See Figure. If about 5 volts does not exist, go to next step. If about 5 volts exists, go to step 4).
  3. Turn ignition off. Disconnect PCM 31-pin connector "C". Check for continuity between ground and PCM connector terminal C29. If continuity exists, repair short in wire between PCM connector terminal C29 and gauge assembly. See WIRING DIAGRAMS article. If continuity does not exist, substitute known-good PCM and recheck. If about 5 volts now exists, replace original PCM.
  4. Turn ignition off. Reconnect gauge assembly and TCM connectors. Place transmission in Park or Neutral position. Start engine. Measure voltage between PCM connector terminal A9 and terminal C29. If less than one volt exists, go to next step. If less than one volt does not exist, repair open in Light Green wire between gauge assembly and PCM connector. See WIRING DIAGRAMS article.
  5. Measure voltage between PCM connector terminal A9 and terminal C29 with transmission in any gear position except Park or Neutral. If 5 volts or more exists, A/T gear position signal is okay. If less than 5 volts exists, repair short in Light Green wire between PCM connector terminal C29 and gauge assembly. See WIRING DIAGRAMS article.
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