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Home >> Acura >> 1991 >> Legend Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Code 59: Crank/CYL Sensor
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Code 59: Crank/CYL Sensor

NOTE: For wiring diagrams, see WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section. For vacuum diagrams, see VACUUM DIAGRAMS article in the ENGINE PERFORMANCE Section.
  1. Turn ignition off. Remove ACG fuse in underdash fuse box for 10 seconds to reset ECU. Start engine, and connect jumper wire to diagnostic connector. Observe CHECK ENGINE light. If light is not flashing, problem is intermittent. Check for poor and loose connections at CRANK/CYL sensor connector and connector C353 at right shock tower. Test drive, and check again.
  2. If CHECK ENGINE light is flashing Code 59, turn ignition off. Disconnect 8-pin CRANK/CYL sensor connector nearest sensor. Measure resistance across White and Orange terminals at sensor. See Figure . If reading is not 650-900 ohms, replace sensor. If reading is within specification, go to next step.
  3. Check continuity between ground and sensor Orange wire terminal. Check continuity between ground and sensor White terminal. If continuity exists, sensor is shorted to ground. Replace sensor. If no continuity exists, go to next step.
  4. Reconnect sensor connector. Attach ECU test harness to main wire harness side only. Measure resistance between harness terminals B9 and B10. See Figure . Resistance should be 650-900 ohms.
  5. If resistance is not within specification, repair open in Orange and/or White wire. If resistance is within specification, check continuity of harness terminal B9 to ground. If continuity is not present, substitute a known good ECU. If condition goes away, replace ECU.
  6. If continuity exists, repair short to ground in Orange wire between harness terminal B9 and 8-pin CRANK/CYL sensor connector.
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