DTC Advanced Diagnostics: P24BA, P24BB (3.0L Engine)

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 

Courtesy of HONDA, U.S.A., INC.

Courtesy of HONDA, U.S.A., INC.

The evaporative emission (EVAP) leak check module pressure sensor detects internal pressure of the fuel tank and converts it into electrical signal. The EVAP leak check module pressure sensor outputs low signal voltage at low pressure and high signal voltage at high pressure. If a signal voltage from the EVAP leak check module pressure sensor is a set value, the powertrain control module (PCM) detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type 

Execution	Continuous
Sequence	None
Duration	0.5 second 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 output voltage is 0.527 V (43.5259 kPa (326.4704 mmHg, 12.85319 inHg)) or less for at least 0.5 second.

DTC: P24BB 

The EVAP leak check module pressure sensor output voltage is 4.352 V (113.6981 kPa (852.8035 mmHg, 33.57503 inHg)) or more for at least 0.5 second.

Possible Cause 

DTC: P24BA 

• EVAP leak check module pressure sensor PTANK line short to ground
• EVAP leak check module pressure sensor VCC6 line short to ground
• EVAP leak check module pressure sensor VCC6 line open

DTC: P24BB 

• EVAP leak check module pressure sensor PTANK line open
• EVAP leak check module pressure sensor PTANK line short to power
• EVAP leak check module pressure sensor SG6 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, the freeze data, and the on-board snapshot 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, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.