P1452
2GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1451: Fuel Tank Pressure Sensor Range/Performance
DTC P1451 - Fuel Tank Pressure Sensor Range/Performance
DTC P1452 - Fuel Tank Pressure Sensor Low Input
DTC P1453 - Fuel Tank Pressure Sensor High Input
DTC SUMMARY
DESCRIPTION
The description can be found in the EVAP (Evaporative Emission) System EVAP System.
MONITOR DESCRIPTION
1 P1451: Pressure sensor abnormal voltage fluctuation or being constant
If the pressure sensor output voltage fluctuates rapidly for 10 seconds, the ECM stops the EVAP system monitor. The ECM interprets this as the pressure sensor voltage fluctuating, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC.
Alternatively, if the sensor output voltage does not change for 10 seconds, the ECM interprets this as the sensor voltage being constant, and stops the monitor. The ECM then illuminates the MIL and sets the DTC.
(Both the malfunctions are detected by 2 trip detection logic).
2 P1452: Pressure sensor voltage low
If the pressure sensor output voltage is below 0.45 V, the ECM interprets this as an open or short circuit malfunction in the pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).
3 P1453: Pressure sensor voltage high
If the pressure sensor voltage output is 4.9 V or more, the ECM interprets this as an open or short circuit malfunction in the pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
P1451 (Noise Monitor):
Key-off monitor sequence 1 to 15
1. Atmospheric pressure measurement
2. First reference pressure measurement
3. Vent valve stuck closed check
4. Vacuum introduction for canister
5. Purge VSV stuck closed check
6. Second reference pressure measurement
7. Canister leak check
8. Fuel tank closed valve (TCV) stuck closed check
9. Vacuum introduction for fuel tank
10. TCV stuck closed check
11. FTP sensor stuck check
12 Third reference pressure measurement
13. Fuel tank leak check
14. FTP sensor stuck check
15. Atmospheric pressure measurement
P1452 and P1453:
TYPICAL MALFUNCTION THRESHOLDS
1. P1451: Pressure sensor noise
2. P1451: Pressure sensor stuck
3. P1452: Pressure sensor low voltage
5. P1453: Pressure sensor high voltage
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
- When a vehicle is brought into the workshop, leave it as it is. Do not change the vehicle condition. For example, do not tighten the fuel tank cap.
- Do not disassemble the canister pump module.
- The Techstream is required to conduct the following diagnostic troubleshooting procedure.
PROCEDURE
1. CONFIRM DTC AND FUEL TANK PRESSURE
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(e) Read the DTCs.
(f) Enter the following menus: Powertrain / Engine and ECT / Data List / Vapor Pressure Tank.
(g) Read the EVAP (Evaporative Emission) pressure displayed on the Techstream.
Result:
C -- GO TO EVAP SYSTEM
B -- CHECK HARNESS AND CONNECTOR (FUEL TANK PRESSURE SENSOR - BODY GROUND)
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (FUEL TANK PRESSURE SENSOR - ECM)
(a) Turn the power switch off.
(b) Disconnect the A53 ECM connector.
(c) Measure the resistance between the PTNK terminal of the ECM connector and the body ground.
Result:
(d) Reconnect the ECM connector.
B -- REPLACE ECM
A -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (FUEL TANK PRESSURE SENSOR - ECM)
(a) Remove the fuel tank assembly.
(b) Disconnect the e1 fuel tank pressure sensor connector.
(c) Disconnect the A53 ECM connector.
(d) Measure the resistance between the PTNK terminal of the ECM connector and the body ground.
Result:
(e) Reconnect the pressure sensor connector.
(f) Reconnect the ECM connector.
B -- REPAIR OR REPLACE HARNESS OR CONNECTOR
A -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (FUEL TANK PRESSURE SENSOR - BODY GROUND)
(a) Remove the fuel tank assembly.
(b) Disconnect the e1 fuel tank pressure sensor connector.
(c) Turn the power switch on (IG).
(d) Measure the voltage and resistance between the terminal of the wire harness side connector and body ground.
Standard:
Result:
(e) Reconnect the canister connector.
B -- REPAIR OR REPLACE HARNESS OR CONNECTOR
A -- Continue to next step.
5. REPLACE FUEL TANK PRESSURE SENSOR
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)
6. REPAIR OR REPLACE HARNESS OR CONNECTOR
HINT: If the tailpipe has been removed, go to the next step before reinstalling it.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)
7. REPLACE ECM
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)
8. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)
(a) Connect Techstream to the DLC3.
(b) Turn the power switch ON (IG) and turn the tester ON.
(c) Wait for at least 60 seconds.
(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
HINT: If no pending DTC is displayed on the tester, the repair has been successfully completed.
NEXT -- COMPLETED