[Previous][Next]
DTC P24C1-00: Switching valve stuck open
 
 
 
 
CIRCUIT OPERATION
  • The switching valve is built into the Evaporative Leak Check Module (ELCM).
  • MFI relay is built into the IPDM E/R.
  • The switching valve power is supplied from the MFI relay.
  • The ECM controls switching valve by turning the power transistor in the ECM "ON" and "OFF".
 
 
TECHNICAL DESCRIPTION
During the key-off evaporative leakage monitoring, after measuring the reference pressure, when there is no pressure change in the evaporative emission canister when turning ON the switching valve, it is judged as switching valve stuck open.
 
 
MONITOR EXECUTION
Once per driving cycle.
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • Evaporative emission purge solenoid monitor
  • Bypass valve monitor
  • Fuel tank solenoid valve monitor
  • Switching valve monitor
  • Canister pressure sensor monitor
  • Manifold absolute pressure sensor monitor
  • Fuel tank pressure sensor monitor
  • Fuel tank differential pressure sensor monitor
  • Barometric pressure sensor/manifold absolute pressure correlation
  • Barometric pressure sensor monitor
  • Fuel level sensor monitor
  • Engine off timer monitor
  • Controller area network (CAN) monitor
Sensor (The sensor below is determined to be normal)
  • Engine coolant temperature sensor
  • Intake air temperature sensor
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
  • Power supply mode of electric motor switch is OFF.
  • 12V battery positive voltage is 11 volts or higher.
  • Engine coolant temperature is higher than 4°C (39°F) and lower than 35°C (95°F).
  • Intake air temperature at ECM wake-up is higher than 4°C (39°F) and lower than 35°C (95°F).
  • ECM is woken up in 5, 6 or 8.5 hours since the power supply mode of electric motor switch was OFF.
  • Barometric pressure is 76 kPa (22.4 in.Hg) or higher.
  • Fuel level is 85 percent or less.
  • Fuel tank pressure at ECM wake-up is less than 19.96 kPa (5.89 in.Hg) or more than 40.00 kPa (11.81 in.Hg).
  • Accumulated time that electric motor switch is ON is more than 1,620 seconds.
Judgment Criterion
  • Difference between first reference pressure and canister pressure is less than specified pressure for 10 seconds.
    or
  • Difference between second reference pressure and canister pressure is less than specified pressure for 10 seconds.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Fuel filler lid cannot be opened even when pressing the fuel filler lid opener switch.
  • Indicates "REFUELING SYSTEM SERVICE REQUIRED" on the information screen in the multi-information display.
 
 
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function, OBD-II Drive Cycle – Pattern 4 OBD- II DRIVE CYCLE.
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • Switching valve (built into the ELCM) failed (stuck open).
  • Open or shorted switching valve circuit, harness damage or connector damage.
  • ECM failed.
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
1.STEP 1. Using scan tool (M.U.T.-III SE), read the DTC.
Use scan tool (M.U.T.-III SE) to check and see if a DTC P24BE-00 or P24BF-00 is set.
Q: Is DTC P24BE-00 or P24BF-00 set?
Troubleshoot the switching valve circuit (Refer to DTC P24BE-00: EVAP Leak Detection Pump Vacuum Switching Valve Circuit Low DTC P24BE-00: EVAP Leak Detection Pump Vacuum Switching Valve Circuit Low refer to DTC P24BF-00: EVAP Leak Detection Pump Vacuum Switching Valve Circuit HighDTC P24BF-00: EVAP Leak Detection Pump Vacuum Switching Valve Circuit High).
 
2.STEP 2. Check of damage in wiring harness between ELCM connector terminal number 4 and ECM connector terminal number 80.
Q: Is the check result normal?
Repair or replace the connector, or repair the damaged harness wire.
 
3.STEP 3. Check of damage in wiring harness between IPDM E/R (with built-in MFI relay) connector terminal number 78 and ELCM connector terminal number 8.
Q: Is the check result normal?
Repair or replace the connector, or repair the damaged harness wire.
 
4.STEP 4. Using scan tool (M.U.T.-III SE) to check the data list, after replace ELCM and perform the evaporative emission system monitor test.
(1) Replace the ELCM (Refer to ENGINE, Engine, Motor and Emission Control – Emission Control – Evaporative Emission System EVAPORATIVE EMISSION CANISTER REMOVAL AND INSTALLATION).
(2) Perform the evaporative emission system monitor test (Refer to EVAPORATIVE EMISSION CONTROL SYSTEM MONITOR TEST).
(3) Use scan tool (M.U.T.-III SE) to check the data list (Refer to DATA LIST REFERENCE TABLE).
  • Item number 430: Vent valve stuck open NG
Q: Is the check result normal?
The inspection is complete.
Replace the ECM (Refer to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION).