DTC Advanced Diagnostics: P24BF
DTC P24BF:Canister Change Over Valve Control Circuit High Voltage

General Description

The evap leak check module change valve is installed in the evap leak check module and used to seal up the EVAP passage when performing the evap leak check. The evap leak check module change valve is normally open (open to the atmosphere) and only closed (sealed) when performing the evap leak check. The powertrain control module (PCM) detects a malfunction and stores a DTC when the close signal is returned continuously for the prescribed time or more though close signal is not output to the evap leak check module change valve.

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

Enable Conditions
Condition
Minimum
Maximum
Battery voltage [BATTERY]
10.0 V
–
[ ]: HDS Parameter

Malfunction Threshold
When open signal is returned continuously for 2.0 seconds or more though close signal is output to the EVAP leak check module change valve.

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.
EVAP LEAK CHECK MODULE CCV line short to power
EVAP leak check module change valve internal circuit leak
PCM internal circuit failure

Confirmation Procedure
Operating Condition
Turn the vehicle to the ON mode.

With the HDS
Select the EVAP TEST in the INSPECTION MENU, then select the FUNCTION TEST with the HDS.

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.