P0454
DTC P0454
GENERAL DESCRIPTION
The Tank Pressure Sensor converts fuel tank pressure to a proportional analog voltage signal which is read by the engine controller for evaluation during execution of the Evaporative System Diagnostic. The Tank Pressure may be below atmospheric pressure (i.e. a vacuum) or above atmospheric pressure.The fuel tank pressure is used to measure the difference between the air pressure (or vacuum) in the fuel tank and the ambient air pressure. The Powertrain Control Module (PCM) supplies a 5-volt reference and a ground to the sensor, which allows the sensor`s output voltage to range from 0.1 to 4.9 volts.
DTC DESCRIPTION
Checking output signals from FTPS under detecting condition, if the stored previous - current signals is high than 33%, PCM sets P0454. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.
DTC Detecting Condition:
DTC DETECTING CONDITION
Specification:
SPECIFICATION
Schematic Diagram:
SCHEMATIC DIAGRAM
MONITOR SCANTOOL DATA
1. IG "OFF"& connect Scantool.
2. ENG "ON" and warm -up the engine to normal operating temperature.
3. Monitor "FTPS" parameter on the service data.
4. Is the "FTPS" data displayed correctly?
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, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure
NO - Go to "Terminal and Connector Inspection" procedure.
TERMINAL AND 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.
POWER CIRCUIT INSPECTION
1. IG "OFF" and disconnect FTPS connector.
2. IG "ON"& ENG "OFF"
3. Measure voltage between terminal 1 of FTPS harness connector and chassis ground.
Specification : Approx. 5 V
4. Is the measured voltage within specification?
YES - Go to "Ground circuit inspection" procedure.
NO - Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
GROUND CIRCUIT INSPECTION
1. IG "OFF" and disconnect FTPS connector.
2. Measure voltage between terminal 1 of FTPS harness connector and chassis ground.
3. Measure voltage between terminal 1 and 2 of FTPS harness connector.
Specification : Voltage difference between Measurement "A" and "B" is below 200 mV.
4. Is the measured voltage within specification?
YES - Go to "Signal Circuit Inspection" procedure.
NO - Repair contact resistance or open in harness and then go to "Verification of Vehicle Repair" procedure.
SIGNAL CIRCUIT INSPECTION
1. Check voltage
a. IG "OFF" and disconnect FTPS connector.
b. IG "ON"& ENG "OFF"
c. Measure voltage between terminal 3 of FTPS harness connector and chassis ground.
Specification : Approx. 0 V
d. Is the measured voltage within specification?
YES - Go to "Component Inspection" procedure.
NO - Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
COMPONENT INSPECTION
1. Check FTPS
Specification:
a. IG "OFF" and connect scantool to DLC (Data Link Connector).
b. Monitor "FTPS" parameter with acceleration on service data.
c. Does the "FTPS" parameter with acceleration on the service data change?
YES - Go to "Check PCM" as follows.
NO - 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 PCM.
a. IG "OFF" disconnect FTPS connector
b. Connect Scantool and IG "ON"& ENG "OFF"
c. Select simulation function on Scantool.
d. Simulate voltage at terminal 3 of FTPS harness connector.
e. Does the signal value of FTP sensor change according to simulation voltage?
YES - 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 - 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.
NOTE: There is a memory reset function on Scantool that can erase optional parts automatically detected and memorized by PCM Before or after testing PCM on the vehicle, use this function to reuse the PCM on the others
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.