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P2172-HIGH AIRFLOW/VACUUM LEAK DETECTED (INSTANTANEOUS ACCUMULATION) (CONTINUED) For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes VACUUM LEAK RESISTANCE IN THE (F856) 5-VOLT SUPPLY CIRCUIT (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND RESISTANCE IN THE (K1) MAP SIGNAL CIRCUIT (K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND RESISTANCE IN (K900) SENSOR GROUND CIRCUIT RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND RESISTANCE IN THE TP SENSOR SIGNAL CIRCUIT TP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND RESISTANCE IN THE (K922) TP SENSOR RETURN CIRCUIT MAP SENSOR TP SENSOR PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. ACTIVE DTC NOTE: The most likely cause of this DTC is a vacuum leak. NOTE: Diagnose any 5-Volt Supply, TP Sensor, Fuel System Lean or Rich, or MAP Sensor DTCs before con- NOTE: The throttle plate should be free from binding and carbon build up. With a scan tool, read DTCs. Is the DTC active at this time? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 914 ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L DR/DH |