Pin failure, no good.
Lets hope for a good old vacuum leak.
P2173-HIGH AIRFLOW/VACUUM LEAK DETECTED (SLOW ACCUMULATION)
Theory of Operation
The Powertrain Control Module (PCM) uses the Manifold Absolute Pressure (MAP) Sensor base model and the Electronic Throttle Control (ETC) Motor position value to create a calculated MAP model value. This calculated MAP model is then compared to the actual MAP Sensor Signal input to the PCM. The PCM uses this comparison to detect vacuum leaks or restrictions in the intake air system. The purpose of this monitor is to detect an instantaneous or gradual change in the intake manifold vacuum that exceeds the calibrated high or low thresholds.
NOTE: Do not use shop air to clean out the MAP Sensor when diagnosing a MAP Sensor related fault as this will cause internal damage to the sensor.
When Monitored and Set Conditions
When Monitored: This diagnostic runs when the following conditions are met:
With the engine running.
Engine speed above approximately 285 rpm.
No active MAP Sensor, Throttle Position Sensor, CMP/CKP Sensor or 5-Volt Reference DTCs.
P2172 or P2174 are not present.
Set Conditions:
The Powertrain Control Module (PCM) monitors and compares the difference between the actual Map Sensor reading and the calculated Map Sensor model over time. The PCM detects a gradual long term increase in the difference between these two values, beyond a calibrated adaptive limit, indicating that there is an air leak in the intake system.
Default Actions:
The MIL will illuminate.
The ETC light is enabled.
Possible Causes
VACUUM LEAK
PCV VALVE OR HOSE LEAKING OR RESTRICTED
RESTRICTION IN THE EXHAUST SYSTEM
INTERNAL ENGINE MECHANICAL COMPONENTS
RESISTANCE IN THE 5-VOLT SUPPLY CIRCUIT
RESISTANCE IN THE MAP SIGNAL CIRCUIT
RESISTANCE IN THE MAP SENSOR GROUND CIRCUIT
MAP SENSOR
THROTTLE BODY - OBSTRUCTION OR FOREIGN OBJECT/MATERIAL
POWERTRAIN CONTROL MODULE (PCM)