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DTC P0715/Flash Code 15: MAINSHAFT Speed Sensor

  1. Ensure mainshaft speed sensor is properly installed. Reinstall as necessary. See REMOVAL & INSTALLATION  . If installation is okay, go to next step.
  2. Turn ignition off. Disconnect mainshaft speed sensor harness connector. Check resistance between sensor connector terminals. If resistance is 400-600 ohms, go to next step. If resistance is not 400-600 ohms, replace mainshaft speed sensor.
  3. Disconnect PCM harness connector "E" (26-pin). Check continuity between ground and PCM harness connector "E" terminals No. 4 (White/Green wire) and No. 17 (White/Blue wire). See Figure . If continuity does not exist, go to next step. If continuity exists, repair short in circuit between PCM harness connector "E" terminals No. 4 and No. 17 and mainshaft speed sensor. See WIRING DIAGRAMS  .
  4. Reconnect mainshaft speed sensor harness connector. Check resistance between PCM harness connector "E" terminals No. 4 (White/Green wire) and No. 17 (White/Blue wire). If resistance is not 400-600 ohms, go to next step. If resistance is 400-600 ohms, use DTC P0720/FLASH CODE 9  test to diagnose problem. Check for loose PCM connectors. Repair as necessary. If connectors are okay, substitute with a known-good PCM and recheck system. If symptom or problem goes away, replace original PCM.
  5. Disconnect mainshaft speed sensor harness connector. Check continuity between PCM harness connector "E" terminal No. 4 (White/Green wire) and sensor terminal No. 1 (Orange wire). If continuity exists, go to next step. If continuity does not exist, repair open in circuit between PCM and mainshaft speed sensor.
  6. Check continuity between PCM harness connector "E" terminal No. 17 (White wire) and mainshaft speed sensor harness connector terminal No. 2 (White wire). See WIRING DIAGRAMS  . If continuity exists, go to next step. If continuity does not exist, repair open in circuit between PCM harness connector "E" terminal No. 17 and mainshaft speed sensor terminal No. 2.
  7. Check for loose PCM connectors. Repair as necessary. If connectors are okay, substitute with a known-good PCM and recheck system. If symptom or problem goes away, replace original PCM.
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