1999 Acura 2.3CL AutomaticFACTORY OEM SERVICE PROCEDURE

Automatic Transmission Gear Position Signal: Integra

  1. Turn ignition on. While observing gear indicator, move transmission gear selector lever to each position. If gear indicator does not indicate correct gear position, perform gear indicator test. See appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS. If gear indicator indicates correctly for all positions, go to next step.
  2. Turn ignition off. Disconnect gauge assembly Blue 10-pin connector located behind gauge assembly. Disconnect Transmission Control Module (TCM) Gray, 26-pin connector located behind left kick panel. Turn ignition on. Backprobing, measure voltage between PCM 32-pin connector terminal No. 9 (Brown/Black wire) and PCM 31-pin connector terminal No. 29 (Light Green/Black wire). See Figure. If voltage is about 5 volts, go to step  4. If voltage is not about 5 volts, go to next step.
  3. Turn ignition off. Disconnect PCM 31-pin connector. Check for continuity between ground and PCM 31-pin harness connector terminal No. 29 (Light Green/Black wire). See Figure. If continuity exists, repair short in Light Green/Black wire between PCM and gauge assembly 10-pin connector. See WIRING DIAGRAMS article. If continuity does not exist, substitute a known-good PCM, then recheck. If symptom or indication goes away, replace original PCM.
  4. Turn ignition off. Reconnect 10-pin gauge assemble connector and TCM 26-pin connector. Start engine. Backprobing, measure voltage between PCM 32-pin connector terminal No. 9 (Brown/Black wire) and PCM 31-pin connector terminal No. 29 (Light Green/Black wire). See Figure. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair open in Light Green/Black wire between PCM 31-pin connector terminal No. 29 and gauge assembly 10-pin connector terminal No. 3. If wire is okay, repair open in Green wire between gauge assembly 10-pin connector terminal No. 6 and A/T gear position switch Gray, 14-pin connector terminal No. 14, located on right front side of center console.
  5. Backprobing, measure voltage between PCM 32-pin connector terminal No. 9 (Brown/Black wire) and PCM 31-pin connector terminal No. 29 (Light Green/Black wire). See Figure. If voltage is less than one volt, A/T gear position signal is functioning properly. If voltage is one volt or more, repair open in Green/White wire between gauge assembly 10-pin connector terminal No. 4 and A/T gear position switch 14-pin connector terminal No. 12.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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