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Home >> Acura >> 1990 >> Legend Base, 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Code 14: Electronic Air Control Valve (EACV)

Code 14: Electronic Air Control Valve (EACV)

NOTE: For wiring diagrams, see WIRING DIAGRAMS article. For vacuum diagrams, see VACUUM DIAGRAMS article.
  1. Turn ignition off. Remove alternator sense fuse in under-hood fuse box for 10 seconds to reset ECU. Start engine and observe CHECK ENGINE and Red LED lights. If lights are off, problem is intermittent. Check for poor or loose connections at EACV wires, connectors C228-C127, C418-C256, C402-C313 and C403-C312. Test drive and check again.
  2. If CHECK ENGINE light is on and Red LED indicates Code 14, turn ignition off. Disconnect 2-pin connector at EACV. Measure resistance between EACV terminals. If resistance is not 8-15 ohms, replace EACV. If resistance is as specified, go to next step.
  3. Check continuity to ground between each EACV terminal. If continuity is present, replace EACV. If not, turn ignition on. Measure voltage between Yellow/Black (positive) and Blue/Red (negative) wire terminals. If battery voltage is present, go to next step. If battery voltage is not present, go to step 5).
  4. Disconnect ECU connector "A". If battery voltage is now present, repair short in Blue/Red wire between ECU terminal A11 and EACV. If battery voltage is not present, substitute a known good ECU and recheck. If condition goes away, replace original ECU.
  5. Measure voltage between Yellow/Black EACV wire terminal and ground. If battery voltage is now present, go to step 6). If not, repair open in Yellow/Black wire between the EACV and main relay.
  6. Turn ignition off. Reconnect 2-pin EACV connector. Connect ECU test harness connector "A" to ECU main harness side only. Turn ignition on. Measure voltage between ECU terminals A11 (positive) and A18 (negative). See Figure . If battery voltage is present, go to step 7). If not, repair open in Blue/Red wire between ECU terminal A11 and EACV.
  7. If battery voltage is now present, connect and disconnect ECU terminals A11 to A18. Listen for clicking from EACV valve. If clicking is not heard, replace EACV valve. If clicking is heard, go to step 8).
  8. Substitute a known good EACV and recheck EACV. If okay, substitute a known good ECU and recheck. If condition goes away, replace original ECU.
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