P0445

DTC P0445 EVAP. EMISSION SYSTEM-PURGE CTRL. VALVE CIRCUIT SHORTED






GENERAL DESCRIPTION
The evaporative emission control 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 PCM controls the Purge Control Solenoid Valve (PCSV) to purge any collected vapors from the canister back to the engine for combustion. This valve is actuated by the purge control signal from the PCM and controls fuel vapor flow from the canister to the intake manifold.

DTC DESCRIPTION
If the PCSV's status is high with surge voltage not detected, the PCM determines that a fault exists and a DTC is stored.

Schematic Diagram:

ACTUATOR TEST MODE
1. Connect scantool to Data Link Connector(DLC).
2. Ignition "ON" & Engine "OFF"
3. Select "Actuator Test Mode" on scantool.




4. Using the scantool, operate PCSV by force.
5. Does the PCSV operate well?

YES: Fault is intermittent caused by poor contact in the 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: Go to "W/Harness Inspection" procedure.

TERMINAL&CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?

YES: Repair as necessary and go to "Verification of Vehicle Repair" procedure.

NO: Go to " Power Circuit Inspection " procedure.

CONTROL CIRCUIT INSPECTION
1. Check for short to ground in harness
1. Ignition "OFF"
2. Disconnect PCSV connector.




3. Measure resistance between terminals "1" and "2" of PCSV harness connector.

Specification : Infinite

4. Is the measured resistance within specifications?

YES: Go to " Component Inspection " procedure.

NO:
- Check for short to battery in harness between PCSV connector and PCM connector.
- Repair or replace as necessary and then, go to " Verification of Vehicle Repair" procedure.

COMPONENT INSPECTION
1. Check PCSV
1. Ignition "OFF"
2. Measure resistance between terminals "1" and "2" of the PCSV connector.

Specification: Approx. 24.5 - 27.5 Ohm (20 °C(68 °F))




3. Monitor the PCSV signal waveform and verify that the ground voltage is less than approx. 0.3 V (1) and the surge voltage (2) is between 40 V and 60 V.
4. Is the PCSV normal?

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

NO: Substitute with a known - good PCSV and check for proper operation. If the problem is corrected, replace PCSV 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.