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Code 13 - Atmospheric (Pa) Sensor

  1. Turn ignition off and remove hazard fuse at battery positive terminal 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 system checker harness between ECU and ECU connector. Turn ignition on. Measure voltage between terminals C13 (pos.) and C12 (neg.). If about 5 volts is read, go to step 3). If not, substitute a known good ECU. If condition is rectified, replace original ECU.
  3. Measure voltage between terminals C9 (pos.) and C12 (neg.). If about 3 volts is not present, go to step 4). If about 3 volts is present, substitute a known good ECU. If condition is rectified, replace original ECU.
  4. Disconnect connector from atmospheric pressure sensor. Measure voltage between terminals C9 (pos.) and C12 (neg.) on harness side. If about 5 volts is read, go to step 5). If about 5 volts is not indicated, repair short in Red wire between ECU terminal C9 and sensor.
  5. Measure voltage between Yellow/Red (pos.) and Brown/Black (neg.) wires. If reading is not about 5 volts, go to step 6). If about 5 volts is present, measure voltage between Red (pos.) and Brown/Black (neg.) terminals. If about 5 volts is not read, repair open Red wire between ECU terminal C9 and sensor. If about 5 volts is read, replace sensor.
  6. Measure voltage between ground and Yellow/Red wire of harness. If about 5 volts is not present, repair open in Yellow/Red wire between ECU terminal C13 and sensor. If about 5 volts is present, repair open Brown/Black wire between ECU terminal C12 and sensor.
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