Code 4: TDC/Crank Sensor
- Turn ignition off. Remove clock fuse in the under-hood relay box for 10 seconds to reset ECU. Start engine and observe "CHECK ENGINE" light. If light is off, problem is intermittent. Test drive and check again.
- If light is on, turn ignition off. Disconnect TDC/CRANK sensor connector nearest the sensor. Measure resistance across terminals "C" and "D" at sensor. See Fig 1
. If reading is not 700-1000 ohms, replace distributor assembly. If reading is within specification, proceed to next step.
- Check continuity between ground and sensor terminals "C" and "D". If continuity exists, sensor is shorted to ground. Replace distributor assembly. If no continuity exists, proceed to next step.
- Reconnect sensor connector. Connect ECU test harness to main harness side only. See Figure
. Check resistance between connector terminals B10 and B12. Resistance should be 700-1000 ohms.
- If resistance is not within specification, repair open in Blue/Yellow and/or Blue/Green wire. If resistance is within specification, substitute a known good ECU and recheck. If condition is rectified, replace original ECU.
Courtesy of AMERICAN HONDA MOTOR CO., INC.