P2422

DTC P2422 EVAP. EMISSION SYSTEM-CANISTER CLOGGING

Component Location:

COMPONENT LOCATION

GENERAL DESCRIPTION
The evaporative emissions system prevents hydrocarbon (HC) vapors from the fuel tank from escaping into the atmosphere where they could form photochemical smog. Gasoline vapors are collected in the charcoal canister. The Canister Close Valve (CCV) closes off the air inlet into the canister for leak detection of the evaporative emission system. The CCV also prevents fuel vapors from escaping from the canister. When the engine purges the HC vapors from the canister, the clean air comes into the canister through the canister air-filter and the CCV.

DTC DESCRIPTION
If the canister is clogged, the PCM determines that a fault exists and a DTC is stored.

DTC Detecting Condition:

DTC DETECTING CONDITION

Specification:

SPECIFICATION

Schematic Diagram:

SCHEMATIC DIAGRAM

COMPONENT INSPECTION
1. Check Voltage
1. Warm up the engine to normal operating condition.
2. Ignition "ON" and Engine "OFF"




3. Measure voltage between terminal 3 of Fuel Tank Pressure sensor connector and chassis ground.

Specification : 2.4 - 2.6 V

4. Is the measured voltage within specifications ?

YES: Fault is intermittent caused by poor contact in Sensor's and/or PCM's connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

NO:
- If of the voltage is below 2.4 V, go to "Check Stuck of the Canister Close Valve" as below.
- If the voltage is 2.4 - 2.6 V, go to "Check Stuck of the Purge Control Solenoid Valve" as below.
- If the voltage is above 2.6 V, disconnect vapor hose to FTPS.
- If the voltage still remains above 2.6 V, Substitute with a known - good FTPS and check for proper operation.
- If the problem is corrected, replace FTPS and go to "Verification of Vehicle Repair" procedure.

2. Check Stuck of the Canister Close Valve
1. Ignition "ON" and Engine "OFF"
2. Tap the Canister Close Valve with a small mallet.




3. Measure voltage between terminal 3 of FTPS connector and chassis ground.

Specification : 2.4 - 2.6 V

4. Is the measured voltage within specifications ?

YES: Substitute with a known - good Canister Close Valve and check for proper operation. If the problem is corrected, replace Canister Close Valve and go to "Verification of Vehicle Repair" procedure.

NO: Go to "Check Canister Close Valve" as below.

3. Check Canister Close Valve
1. Ignition "ON" & Engine "OFF"




2. Perform Actuation Test for CCV with scantool.

Specification :With it energized, CCV is closed
With it not energized, CCV is closed

3. Is the CCV O.K ?

YES: Go to "Check Clog of the Air Filter" as below.

NO: Substitute with a known - good Canister Close Valve and check for proper operation. If the problem is corrected, replace Canister Close Valve and go to "Verification of Vehicle Repair" procedure.

4. Check Air Filter
1. Ignition "OFF"
2. Using a small 1/4" tube, by pass the canister purge valve by connecting the two purge hoses together.
3. Disconnect the 1/2" hose from the canister to the CCV, at the CCV.
4. Engine "ON"




5. Measure voltage terminal 3 of FTPS connector and chassis ground.

Specification : 2.0 V (or less)

6. Is the measured voltage within specifications ?

YES: If the voltage is below 2.4 V, reconnect the canister purge valve hoses, then Go to "Check fuel cut valve" as below.

NO:
- If the voltage rises to 2.4 volts
- Substitute with a known - good air filter and check for proper operation.
- If the problem is corrected, replace air filter and go to "Verification of Vehicle Repair" procedure.

5. Check Fuel Cut Valve
1. Ignition "OFF"
2. Lower the fuel tank and remove fuel cut valve.
3. Check if the valve rattles by shaking up and down.
4. Listen to the float.

Specification : The float should rattle.

5. Is the fuel cut valve OK ?

YES: Substitute with a known - good charcoal Canister Valve and check for proper operation. If the problem is corrected, replace Charcoal Canister Valve and go to "Verification of Vehicle Repair" procedure.

NO: Substitute with a known - good Fuel Cut Valve and check for proper operation. If the problem is corrected,replace Fuel Cut Valve and go to "Verification of Vehicle Repair" procedure.

VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code(DTC) which has been diagnosed.
2. Using a Scantool, Clear the DTCs.
3. Operate the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Monitor that all readiness test have been verified as "Complete"
5. Are any DTCs present ?

YES: Go to the applicable troubleshooting procedure.

NO: System is performing to specification at this time.