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P2074-MAP/TPS CORRELATION - HIGH AIRFLOW/VACUUM LEAK DETECTED For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: 9 Hg, engine RPM greater than 2000 RPM, and a closed throttle. One Trip Fault. Three good trips to turn off the MIL. Possible Causes VACUUM LEAK MAP SENSOR CIRCUIT(S) OPEN, SHORTED, OR HIGH RESISTANCE THROTTLE POSITION SENSOR CIRCUIT(S) OPEN, SHORTED, OR HIGH RESISTANCE MAP SENSOR THROTTLE POSITION SENSOR POWERTRAIN CONTROL MODULE (PCM) Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. ACTIVE DTC NOTE: Diagnose and repair any TP Sensor or MAP Sensor DTCs before continuing. NOTE: Diagnose and repair any VSS or 5 Volt supply circuit DTCs before continuing. NOTE: The throttle plate and linkage should be free from binding and carbon build up. NOTE: Make sure the throttle plate is at the idle position. With a scan tool, select View DTCs. Is the status Active for this DTC? Yes >> Go to 2 No >> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 2. VACUUM LEAK NOTE: This code is enabled on engines equipped with a plastic intake manifold to limit engine operation if NOTE: A large vacuum leak is the most probable cause of this DTC. Inspect the throttle plate. If the throttle blade is bent or will not close, the throttle body may need to be replaced. Inspect the MAP Sensor and Throttle Body for proper installation. Inspect the engine for any mechanical conditions that can cause low engine vacuum. Were any problems found? Yes >> Repair as necessary. Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Go to 3 PM ENGINE ELECTRICAL DIAGNOSTICS - GPEC 9 - 719 |