1987 Acura Integra LS, 2D Hatchback, AutomaticFACTORY OEM SERVICE PROCEDURE

Code - 9 CRK/CYL Sensor

  1. Turn ignition off. Disconnect hazard fuse at battery positive terminal for 10 seconds to reset ECU. Start engine and check for PGM-FI warning light on or off. If light is off, test drive and check again.
  2. If light is on, turn engine off. Disconnect sensor connector nearest the sensor. Measure resistance between sensor connector and sensor, Red terminal and White terminal, with an ohmmeter. If ohm reading is not 650-850 ohms, replace sensor. If ohm reading is within specifications, proceed to next step.
  3. Check continuity between ground and Red terminal. Check continuity between ground and White terminal. If continuity exists, replace sensor. If no continuity exists, proceed to next step.
  4. Reconnect sensor connector. Attach system checker harness to main wire harness only, not to ECU. Using an ohmmeter, check resistance between connector terminal No. C1 and C2. Resistance should be 650-850 ohms.
  5. If resistance not within specifications, repair open in Red and/or White wire. If resistance is within specifications, connect a known good ECU and recheck. Replace ECU if original is defective.
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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.