LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 1991 >> Civic Base, 2D Hatchback >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Codes >> Code 13 - Atmospheric Pressure (Pa) Sensor
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Code 13 - Atmospheric Pressure (Pa) Sensor

  1. Turn ignition off. Remove ECU fuse for 10 seconds to reset. Turn ignition on. Verify if CHECK ENGINE light is on and if LED is flashing Code 13. If LED is flashing Code 13, go to next step. If LED is not flashing Code 13, problem is intermittent. Check connectors at PA sensor.
  2. Turn ignition off. Disconnect harness from PA sensor. Measure voltage at harness between Yellow/White (+) terminal and ground. If reading is about 5 volts, go to next step. If reading is not about 5 volts, repair open in Yellow/White wire between ECU terminal C13 and PA sensor. If wire is okay, substitute a known good ECU, and recheck. If condition is corrected, replace original ECU.
  3. Measure voltage between Yellow/White (+) and Green/White (-) terminals. If reading is about 5 volts, go to next step. If reading is not about 5 volts, repair open in Green/White wire between ECU terminal C12 and PA sensor. If wire is okay, substitute a known good ECU, and recheck. If condition is corrected, replace original ECU.
  4. Measure voltage between Red/White (+) and Green/White (-) terminals. If reading is about 5 volts, go to next step. If reading is not about 5 volts, repair open in Red/White wire between ECU terminal C9 and PA sensor. If wire is okay, substitute a known good ECU, and recheck. If condition is corrected, replace original ECU.
  5. Turn ignition off. Remove ECU fuse for 10 seconds to reset ECU. Turn ignition on. Verify if CHECK ENGINE light is on and if LED is flashing Code 13. If LED is flashing Code 13, replace PA sensor. If LED is still flashing Code 13, substitute a known good ECU, and recheck. If condition is corrected, replace original ECU.
scientia non olet · About LEMON Manuals