DTC P2074-Map/TPS Correlation - High Airflow/Vacuum Leak Detected: Notes
For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article.
Theory of Operation
This DTC sets when an unexpected high intake manifold air flow condition exists that can lead to increased engine speed and puts the NGC into a High Air flow Protection limiting mode. The High Air flow Protection feature includes RPM limits for when a Throttle and/or MAP sensor limp-in fault is present.
- When Monitored:
During all drive modes
- Set Condition:
If vacuum drops below 1.5"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.