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P2172-HIGH AIRFLOW/VACUUM LEAK DETECTED (INSTANTANEOUS ACCUMULATION) (CONTINUED) 2. VACUUM LEAK NOTE: This code is enabled on engines with a plastic intake manifold and is intended to limit the maximum 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 or any vacuum leaks. Inspect the MAP Sensor for proper installation. 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 Accelerator pedal. 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, perform the Throttle Follower Test. TP Sensor No.1 should start at approximately 0.8 of a volt and increase to 4.2 volts. TP Sensor No.2 should start at approximately 4.2 volts and decrease to 0.8 of a volt. Is the voltage transition smooth between the appropriate values? Yes >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 5 9 - 964 ENGINE ELECTRICAL DIAGNOSTICS WK |