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Home >> Dodge and Ram >> 2001 >> Neon Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1299: Vacuum Leak Found (IAC Fully Seated) >> Testing

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 as necessary. If no vacuum leaks are found and PCV system functions properly, go to next step.
  2. Turn ignition on. Using scan tool, monitor TP sensor voltage. Slowly open throttle from idle to wide open throttle. Voltage should start at about .8 volt at idle, and increase smoothly to more than 3.5 volts at wide open throttle. If voltage is as specified, go to next step. If voltage is not as specified, replace TP sensor.
  3. Ensure throttle is fully closed and resting on throttle stop. Using scan tool, read TP sensor voltage. If voltage is less than 1.5 volts, go to next step. If voltage is 1.5 volts or more, replace TP sensor.
  4. Turn ignition off. Connect a vacuum gauge to manifold vacuum. Start engine and warm to normal operating temperature. If engine will not idle, maintain a constant RPM above idle. Using scan tool, read MAP sensor vacuum value. If scan tool reading is within one in. Hg of vacuum gauge reading, test is complete. If scan tool reading is not within one in. Hg of vacuum gauge reading, replace MAP sensor.
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