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P2074-MAP/TPS CORRELLATION - HIGH AIRFLOW/VACUUM LEAK DETECTED (CONTINUED) 2. VACUUM LEAK NOTE: This code is enabled on engines with a plastic intake manifold and is intended to shut down the NOTE: A large vacuum leak is most likely the cause of this DTC. Inspect the Power Brake Booster for any vacuum leaks. Inspect the PCV system for proper operation and vacuum leaks. Inspect the throttle plate to see if it is bent and will close entirely, if it is bent it may need to be replaced. Inspect the MAP Sensor for proper installation. Verify the engine is free from any mechanical failures. Were any vacuum leaks found? Yes >> Repair the vacuum leak as necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 3 3. MAP SENSOR OPERATION Start the engine. With a scan tool, monitor the MAP Sensor voltage. Snap the throttle. Does the MAP Sensor voltage vary from below 2.0 volts at idle to above 3.5 volts at wide open throttle? Yes >> Go To 4 No >> Go To 11 4. TP SENSOR OPERATION Ignition on, engine not running. With a scan tool, monitor the TP Sensor voltage while slowly pressing the throttle pedal from closed to wide open Does voltage start at approximately 0.8 of a volt and go above 3.5 volts with a smooth transition? Yes >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 5 9 - 848 ENGINE ELECTRICAL DIAGNOSTICS WK |