P0624
DTC P0664 FUEL CAP LAMP CONTROL CIRCUITGENERAL DESCRIPTION
Due to the increasing ambient temperature, fuel vapors are generated in the tank. In order to control the release of these vapors to the atmosphere, the evaporative emissions control system is used. The evaporative emission control system reduces hydrocarbon (HC) emissions by trapping fuel tank vapors until they can be burned in the combustion process. Evaporating fuel is stored in a charcoal canister until it can be flushed into the intake manifold. The evaporative emission control system is made up of a fuel tank that can be completely sealed from outside air, a Fuel Tank Pressure Sensor (FTPS), a Canister Close Valve (CCV) that seals the canister from the outside air, a canister filled with activated charcoal granules, a Purge Control Solenoid Valve (PCSV). The evaporative emission system can be checked for leaks by sealing the system off from the outside air, creating a vacuum, and monitoring if the system can hold that vacuum sufficiently for a set amount of time. If it cannot, a leak exists somewhere in the system.
DTC DESCRIPTION
When ECM/PCM detects Open or Short in circuit, ECM/PCM sets DTC P0624.
DTC Detecting Condition:
Schematic Diagram (A/T):
Schematic Diagram (M/T):
MONITOR SCANTOOL DATA
1. Connect scantool to Data Link Connector (DLC).
2. IG "ON".
3. Select "Diagnostic Trouble Codes (DTCs)" mode, and then Press F4 (DTAL) to check DTC information from the DTCs menu.
4. Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions noted in the DTC detecting condition.
5. Read "DTC Status" parameter.
6. Is parameter displayed "History (Not Present) fault"??
NOTE:
- History fault : DTC occurred but has been cleared.
- Present fault : DTC is occurring at present time.
YES - Fault is intermittent caused by poor contact in the sensor's and/or ECM/PCM's connector or was repaired and ECM/PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO - Go to "Terminal & Connector Inspection" procedure
TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminal condition. 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 "Main relay circuit inspection" procedure.
POWER CIRCUIT INSPECTION
1. IG "OFF".
2. Disconnect the instrument cluster harness connector.
3. Measure the voltage between terminal 11/M09-1 of harness connector and ground.
Specification : B+
4. Is the measured voltage within specification?
YES - Go to "Control circuit inspection" procedure.
NO
- Check the fuse (ECU A 30A) between battery and cluster.
- Repair Open or Short in power circuit and then go to "Verification of vehicle Repair" procedure.
CONTROL CIRCUIT INSPECTION
1. IG "OFF".
2. Disconnect ECM/PCM harness connector.
3. IG "ON".
4. Measure the voltage between terminal 53/C01-1 (94/C01) of PCM (ECM) harness connector and ground.
Specification : B+
5. Is the measured voltage within specification?
YES - Go to "Component inspection" procedure.
NO
- Check the bulb and repair as necessary.
- Repair Open or Short in control circuit and then go to "Verification of vehicle Repair" procedure.
COMPONENT INSPECTION
1. IG "OFF".
2. Disconnect ECM/PCM harness connector.
3. Short terminal 53/C01-1 (941C01) of PCM (ECM) harness connector to ground.
Specification : Fuel filler cap lamp ON.
4. Is the Fuel filler cap warning lamp turned on normally?
YES - Substitute with a known - good ECM/PCM and check for proper operation. If the problem is corrected, replace ECM/PCM and go to "Verification of Vehicle Repair" procedure.
NO - Substitute with a known - good instrument cluster and check for proper operation. If the problem is corrected, replace instrument cluster 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. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Clear the DTCs and Operate the vehicle within DTC Enable conditions in General information.
3. Are any DTCs present?
YES - Go to the applicable troubleshooting procedure.
NO - System is performing to specification at this time.