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LEMON is the spiritual successor to CHARM, I recommend you try it!
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Manifold Pressure/Vacuum Sensor: Testing and Inspection
Diagnostic Trouble Code
(DTC) DTC 33 or DTC 34 indicates a failure in the Manifold Absolute Pressure
(MAP) sensor circuit. Also refer to
MAP Output Check Diagnosis to check the
MAP sensor if there is no DTC. Refer to
Diagnostic Trouble Code Charts. Under
Computer and Controls/System Diagnosis/Procedures.
Testing and Inspection