DTC P24C0
DTC P24C0: Canister Change Over Valve Close Malfunction
General Description
When the canister change over valve is functioning normally, the value of evaporative emission (EVAP) leak check module pressure sensor will not show an negative pressure during the purge since the passage for purge flow and depressurization are constantly secured unless during the EVAP leak check. However, if the purge control is activated while the canister change over valve is stuck closed or the passage, the dust filter, or the drain is clogged, a fuel tank buckling will occur due to excessive negative pressure. If a relative pressure calculated from the EVAP leak check module pressure sensor continuously shows an excessive negative pressure, 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 | 1 seconds or more |
| DTC Type | Two drive cycles, MIL on |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| Engine coolant temperature [ECT SENSOR 1] before EVAP purge control starts | 104 deg.F (40 deg.C) | - |
[ ]: HDS Parameter
| Condition | Minimum | Maximum |
|---|---|---|
| 12 volt battery voltage [BATTERY] | 10.5 V | - |
| Fuel feedback | Closed loop | |
[ ]: HDS Parameter
Malfunction Threshold
The relative pressure calculated from the EVAP leak check module pressure sensor value is less than -3.7 kPa (-28.2 mmHg, -1.1 inHg) for at least 1 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.
- Canister change over valve stuck closed
- Dust filter clogged
Confirmation Procedure
Operating Condition
- Enter the maintenance mode, then start the engine, and let it idle until the radiator fan comes on.
- When the diagnosis does not finish at idle, drive at 30 - 75 mph (48 - 120 km/h) at EVAP canister purge valve duty [EVAP PC Duty] 20 % or more.
- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
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.