P0452

Component Location





General Description

The evaporative emission control system prevents hydrocarbon vapors from escaping from the fuel tank into the atmosphere where they could form photochemical smog. Gasoline vapors are collected in the charcoal canister. The Fuel Tank Pressure Sensor (FTPS) is an integral part of the evaporative monitoring system. The ECM monitors the FTPS signal to detect vacuum decay and excess vacuum. The FTPS measures the difference between the air pressure inside the fuel tank and outside air pressure to check the purge control solenoid valve operation and for leak detection in the evaporative emission control system by monitoring pressure and vacuum levels in the fuel tank during the purge control solenoid valve operating cycles.

DTC Description

Checking output signals of fuel tank pressure sensor under detecting condition, if the tank pressure is lower than threshold, ECM sets P0452. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.

DTC Detecting Condition





Specification





Diagnostic Circuit Diagram





Signal Waveform & Data








Fig.1) Normal waveform of FTPS at idle.
Fig.2) Normal data of FTPS at idle.

Monitor Scantool Data

1. Connect scantool to Data Link Connector(DLC).
2. IG "ON".
3. Select "DTC" button, and then Press "DTC Status" to check DTC's information from the DTCs menu.
4. Read "DTC Status" parameter.




5. Is parameter displayed "Present fault"?�






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?






Power Circuit Inspection

Check voltage
1. IG "OFF" and disconnect FTPS connector.
2. IG "ON".
3. Measure voltage between power terminal of FTPS harness connector and chassis ground.

Specification :Approx. 5V


4. Is the measured voltage within specification ?






Signal Circuit Inspection

Check short to ground in harness
1. IG "OFF" and disconnect FTPS connector and ECM connector.
2. Measure the resistance between signal terminal of FTPS harness connector and chassis ground.

Specification :Infinite


3. Is the measured resistance within specification ?





Check open in harness
1. IG "OFF" and disconnect FTPS connector and ECM connector.
2. Measure the resistance between signal terminal of FTPS harness connector and FTPS signal terminal of ECM harness connector.

Specification :Below 1Ohms


3. Is the measured resistance within specification?






Component Inspection

Check FTPS
1. IG "OFF" and connect scantool to DLC(Data Link Connect
2. Monitor "FTPS" parameter on service data.

Specification :Approx. 15.5 - 18.5Ohms (20°C(68°F))






3. Is the "FTPS" parameter on the service data O.K ?






Verification of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select "DTC" button.
2. Press "DTC Status" button and confirm that "DTC Readiness Flag" indicates "Completed". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
3. Read "DTC Status" parameter.
4. Is parameter displayed "History(Not Present) fault"?