DTC Advanced Diagnostics: P24BA, P24BB
DTC P24BA:Evaporative Emission (EVAP) Leak Check Module Absolute Pressure Sensor Circuit Low Voltage
DTC P24BB:Evaporative Emission (EVAP) Leak Check Module Absolute Pressure Sensor Circuit High Voltage

General Description



The barometric pressure (BARO) sensor, and leak check sensor all measure barometric pressure when the engine is stopped. The sensor outputs are compared to detect malfunction. If the BARO sensor and the leak check sensor are within an acceptable range of each other, then conditions are normal. If the BARO sensor and the leak check sensor are out of range, then the out of range sensor is judged as abnormal. When a DTC is set, use these values to determine the abnormal sensor. If any of these values are out of range, the powertrain control module (PCM) detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Once per driving cycle
Sequence
None
Duration
3 seconds or more
DTC Type
Two drive cycles, MIL on

Enable Conditions
Condition
 
Vehicle
ON mode

Malfunction Threshold
DTC: P24BA

The leak detection module absolute pressure sensor output level is 44 kPa (331 mmHg, 13 inHg) or less for at least 3 seconds.

DTC: P24BB

The leak detection module absolute pressure sensor output level is 114 kPa (856 mmHg, 33 inHg) or more for at least 3 seconds.

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
Leak detection module absolute pressure sensor ELCMP line short to power
Leak detection module absolute pressure sensor ELCMP line open
Leak detection module absolute pressure sensor ELCMP line short to ground
Leak detection module absolute pressure sensor SG line open
Leak detection module absolute pressure sensor VCC line open
Leak detection module absolute pressure sensor out of range

Confirmation Procedure
Operating Condition
Turn the vehicle to the ON mode, and wait for at least 3 seconds.

With the HDS
None.

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.