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DTC P0720: Countershaft Speed Sensor Circuit: 3.2TL

  1. Check countershaft speed sensor installation. If countershaft speed sensor is properly installed, go to next step. If countershaft speed sensor is not properly installed, repair as necessary and retest system.
  2. Disconnect countershaft speed sensor 2-pin connector. Measure resistance between countershaft speed sensor terminals. If resistance is 400-600 ohms, go to next step. If resistance is not 400-600 ohms, replace countershaft speed sensor.
  3. Disconnect PCM 16-pin harness connector. Check continuity between ground and PCM 16-pin harness connector terminal No. 10 (Blue wire). See Figure. If continuity is present, repair short to ground in Blue wire between PCM 16-pin harness connector terminal No. 10 and countershaft speed sensor 2-pin harness connector terminal No. 1. If continuity is not present, go to next step. See WIRING DIAGRAMS article. Repair as necessary.
  4. Measure continuity between ground and PCM 16-pin harness connector terminal No. 16 (Green wire). If continuity is present, repair short to ground in Green wire between PCM 16-pin harness connector terminal No. 16 and countershaft speed sensor 2-pin harness connector terminal No. 2. If continuity is not present, go to next step.
  5. Connect countershaft speed sensor connector. Measure resistance between PCM 16-pin harness connector terminals No. 10 (Blue wire) and No. 16 (Green wire). Resistance should be 400-600 ohms. If resistance is not as specified, repair open in wire(s) between PCM 16-pin harness connector and countershaft speed sensor 2-pin harness connector. If resistance is as specified, check PCM harness connectors for loose, damaged or corroded terminals. If problem is present, repair harness connector. If problem is not present, replace PCM with known-good PCM and retest system. If symptom or indication goes away, replace original PCM.
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