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DTC P0720/9: Countershaft Speed Sensor

WARNING: This page is about a different car, the 1998 Honda Odyssey, 1998 Honda Accord, and 1998 Acura 2.3CL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Using scan tool, retrieve A/T freeze data. Clear fault codes and road test vehicle under same conditions freeze data was recorded. If fault code returns, go to next step. If fault code does not return, problem is intermittent, check mainshaft speed sensor and PCM connections.
  2. Ensure countershaft speed sensor is installed properly. See COUNTERSHAFT SPEED SENSOR  under REMOVAL & INSTALLATION. Disconnect countershaft speed sensor harness connector. Using a DVOM, measure resistance between sensor terminals. See COUNTERSHAFT SPEED SENSOR  under COMPONENT TESTING.
  3. If resistance is not 400-600 ohms, replace countershaft speed sensor. If resistance is 400-600 ohms, disconnect 16-pin PCM harness connector "D". Check for continuity between ground and 16-pin PCM harness connector "D", terminals No. 16 (Green wire) and No. 10 (Blue wire). See Figure .
  4. If continuity is present, repair short to ground in Green wire or Blue wire between PCM and countershaft speed sensor. If continuity is not present, reconnect countershaft speed sensor harness connector. Measure resistance between 16-pin PCM harness connector "D", terminals No. 16 (Green wire) and No. 10 (Blue wire).
  5. If resistance is 400-600 ohms, check for loose PCM harness connectors. Replace PCM with a known-good unit if necessary. If resistance is not 400-600 ohms, repair loose connection or open in Green wire or Blue wire between 16-pin PCM harness connector "D" and countershaft speed sensor harness connector.
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