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DTC P0129: Barometric Pressure Out-Of-Range Low: Testing

  1. Ignition on, engine not running. With the DRBIII® scan tool, read the MAP sensor voltage. Is the voltage below 2.2 volts? If yes, go to next step. If no, go to step  11.
  2. Turn the ignition off. Disconnect the MAP sensor harness connector. Ignition on, engine not running. Measure the voltage of the 5-volt supply circuit in the MAP sensor harness connector. Is the voltage between 4.5 and 5.2 volts? If yes, go to next step. If no, go to step  7.
  3. Turn the ignition off. Disconnect the MAP sensor harness connector. Ignition on, engine not running. With the DRBIII® scan tool, monitor the MAP sensor voltage. Is the voltage above 2.2 volts? If yes, replace the MAP sensor. If no, go to next step.
    4. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  4. Turn the ignition off. Disconnect the MAP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K1) MAP signal circuit at the MAP sensor harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the (K1) MAP signal circuit for an open.
  5. Turn the ignition off. Disconnect the MAP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the MAP signal circuit in the MAP sensor harness connector to ground. Is the resistance below 100 ohms? If yes, repair the MAP signal circuit for a short to ground. If no, go to next step.
    6. NOTE: Before continuing, disconnect the PCM harness connectors and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.
  6. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
  7. Turn the ignition off. Disconnect the MAP sensor harness connector. Reconnect the PCM harness connectors. Ignition on, engine not running. Measure the voltage of the (K6) 5-volt supply circuit in the MAP sensor harness connector. Is the voltage above 5.2 volts? If yes, repair the (K6) 5-volt supply circuit for a short to battery voltage. If no, go to next step.
  8. Turn the ignition off. Disconnect the MAP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K6) 5-volt supply circuit in the MAP sensor harness connector to ground. Is the resistance below 100 ohms? If yes, repair the 5-volt supply circuit for a short to ground. If no, go to next step.
    9. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  9. Turn the ignition off. Disconnect the MAP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K6) 5-volt supply circuit between the MAP sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the (K6) 5-volt supply circuit for an open.
    10. NOTE: Before continuing, disconnect the PCM harness connectors and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.
  10. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
    11. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  11. Turn the ignition off. Reconnect the PCM harness connectors. Start the engine. If the engine will not idle, maintain an engine speed between 800 and 1500 RPM. Allow the engine to idle. With the DRBIII® scan tool, read the IAC Current. Is the IAC current below 146 milliamps? If yes, refer to DTC P0508: IAC VALVE SENSE CIRCUIT LOW . If no, go to next step.
    12. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  12. Start the engine. If the engine will not idle, maintain an engine speed between 800 and 1500 RPM. Allow the engine to idle. With the DRBIII® scan tool, read the IAC current. Is the IAC current above 999 milliamps? If yes, refer to DTC P0509: IAC VALVE SENSE CIRCUIT HIGH . If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
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