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Home >> Acura >> 1989 >> Legend Base, 2D Coupe, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Tests W/Codes - V6 >> Trouble Codes >> Code 13 - Atmosphere Sensor >> Atmospheric (PA) Sensor

Atmospheric (PA) Sensor

  1. Turn ignition off. Disconnect alternator sense fuse in 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.
  2. If light is on, turn ignition off. Connect ECU test harness between ECU and ECU connector. Turn ignition on. Measure voltage between ECU terminals C13 (pos.) and C14 (neg.). See Figure . If about 5 volts is indicated, go to step 3). If not, substitute a known ECU and recheck. If specified voltage in now available, replace original ECU.
  3. Measure voltage between terminals C9 (pos.) and C14 (neg.). If about 3 volts is not indicated, go to step 4). If about 3 volts is indicated, substitute a known good ECU and recheck. If condition is rectified, replace original ECU.
  4. If about 5 volts was indicated instead of 3 volts, repair open in Red wire between ECU terminal C9 and PA sensor. If not, turn ignition off. Disconnect 3-wire PA sensor connector. Turn ignition on.
  5. Measure voltage between Yellow/White wire terminal and ground. If about 5 volts is present, go to next step. If not, repair open in Green/White wire between ECU terminal C14 and PA sensor.
  6. If about 5 volts is present from step 5), measure voltage between Red (pos.) and Green/White (neg.) terminals. If about 5 volts is present, replace PA sensor. If not, repair short in Red wire between ECU terminal C9 and PA sensor or replace ECU.
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