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P2074-MAP/TPS CORRELLATION - HIGH AIRFLOW/VACUUM LEAK DETECTED (CONTINUED) For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. Theory of Operation This DTC sets when an unexpected high intake manifold air flow condition exists that can lead to increased engine • When Monitored: • Set Condition: 9 Hg with engine RPM greater than 2000 RPM and closed throttle. One Trip Fault. Three good trips to turn off the MIL. 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 THE (F855) 5-VOLT SUPPLY CIRCUIT (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND RESISTANCE IN THE (K22) TP SENSOR NO.1 SIGNAL CIRCUIT (K22) TP SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO GROUND RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT MAP SENSOR THROTTLE POSITION SENSOR PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. ACTIVE DTC NOTE: Diagnose any TP Sensor or MAP Sensor component DTCs before continuing. NOTE: If the P0501 - No Vehicle Speed Signal is set long with this DTC, refer to the P0501 diagnostics 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, 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) HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 803 |