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No "CHECK ENGINE" Light

  1. Turn ignition on. If oil pressure light is on, go to step 2). If light is off, inspect fuse No 1 (Civic). If fuse is okay, repair open circuit in Yellow wire between fuse and combination meter.
  2. Turn ignition off. Connect ECU test harness between ECU and connector. See Figure . Connect terminal B6 to ground. Turn ignition on. If "CHECK ENGINE" light is now on, go to step 3). If light is off, replace light bulb or repair open in wire between ECU terminal B6 and combination meter.
  3. Measure voltage individually between ground and ECU terminals A2, A4, A16, and A18. If less than one volt is present, substitute a known good ECU and recheck. If condition is rectified, replace original ECU. If more than one volt is present, repair open in wire between ECU and thermostat housing.
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