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DTC P1299: Vacuum Leak Found (IAC Fully Seated): Testing

  1. Inspect intake manifold and power brake booster for vacuum leaks. Check Positive Crankcase Ventilation (PCV) for proper operation and vacuum leaks. Repair PCV system as necessary. If no vacuum leaks are found and PCV system functions properly, go to next step.
  2. Turn ignition on. Ensure throttle is fully closed (throttle against throttle stop). Using scan tool, read TP sensor voltage. If voltage is 1.5 volts or less, go to next step. If voltage is more than 1.5 volts, replace TP sensor.
  3. Turn ignition off. Connect a vacuum gauge to an intake manifold vacuum source. Start engine and allow it to idle. If engine will not idle, maintain a constant engine RPM above idle. Using scan tool, read MAP sensor vacuum. If scan tool reading is within one in. Hg of vacuum gauge reading, turn ignition off and go to next step. If scan tool reading is not within one in. Hg of vacuum gauge reading, replace MAP sensor.
  4. Turn ignition on. Using scan tool, monitor TP sensor voltage while slowly opening throttle to Wide Open Throttle (WOT) position. If voltage is 3.4 volts or more at WOT, no problem is indicated at this time. Test is complete. If voltage is less than 3.4 volts at WOT, replace TP sensor.
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