Diagnostic Aids
Perform this test when directed by QUICK TEST or TEST S. Barometric pressure sensor output is digital and must be measured with an oscilloscope or MAP/BP tester.
To prevent replacement of good components, be aware that the following non-EEC related areas may be the cause of problem:
- Unusually High Or Low Atmospheric Barometric Pressure
- Kinked Or Blocked Vacuum Lines
- Engine Mechanical Condition (Valves, Vacuum Leaks, Valve Timing, EGR Valve, etc.)
This test is intended to diagnose the following:
- MAP/BP Sensor
- Vehicle Harness Circuits (VREF, MAP/BP SIG & SIG RTN)
- MAP Vacuum Line
- ECA