DTC P24BA, P24BB
DTC P24BA: Evaporative Emission (EVAP) Leak Check Module Pressure Sensor Circuit Low Voltage
DTC P24BB: Evaporative Emission (EVAP) Leak Check Module Pressure Sensor Circuit High Voltage
General Description
The evaporative emission (EVAP) leak check module pressure sensor detects pressure in the fuel tank when the canister change over valve is open and detects barometric pressure when the canister change over valve is closed. If the EVAP leak check module pressure sensor output voltage is a set value for a set time, the powertrain control module (PCM) detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| 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 EVAP leak check module pressure sensor [Absolute Pressure of ELCM Pressure Sensor] output level is 44 kPa (13 inHg, 331 mmHg) or less for at least 3 seconds.
DTC: P24BB
The EVAP leak check module pressure sensor [Absolute Pressure of ELCM Pressure Sensor] output level is 119 kPa (36 inHg, 893 mmHg) 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.
DTC: P24BA
- EVAP leak check module pressure sensor ELCMPA line short to ground
DTC: P24BB
- EVAP leak check module pressure sensor ELCMPA line open
- EVAP leak check module pressure sensor ELCMPA line short to power
- EVAP leak check module pressure sensor VCC line open
Common
- EVAP leak check module pressure sensor failure
- PCM internal circuit failure
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.