M20F-FXS, M20G-FXS ENGINE CONTROL SFI SYSTEM P145011 Fuel Tank Pressure Sensor Circuit Short to Ground P145015 Fuel Tank Pressure Sensor Circuit Short to Battery or Open P14502A Fuel Tank Pressure Sensor Signal Stuck in Range P14502F Fuel Tank Pressure Sensor Signal Erratic
DTC SUMMARY
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Note |
|---|---|---|---|---|---|
| P145011 | Fuel Tank Pressure Sensor Circuit Short to Ground | The output voltage of the fuel tank pressure sensor is less than 0.25 V for 0.5 seconds or more. | ·
Fuel tank pressure sensor ·
Connector/wire harness (fuel tank pressure sensor - ECM) ·
ECM |
Comes on | SAE Code: P1452 |
| P145015 | Fuel Tank Pressure Sensor Circuit Short to Battery or Open | The output voltage of the fuel tank pressure sensor is higher than 4.95 V for 0.5 seconds or more. | ·
Fuel tank pressure sensor ·
Connector/wire harness (fuel tank pressure sensor - ECM) ·
ECM |
Comes on | SAE Code: P1453 |
| P14502A | Fuel Tank Pressure Sensor Signal Stuck in Range | Fuel tank pressure sensor output voltage does not vary in certain time period. | ·
Fuel tank pressure sensor ·
Connector/wire harness (fuel tank pressure sensor - ECM) ·
ECM |
Comes on | SAE Code: P1451 |
| P14502F | Fuel Tank Pressure Sensor Signal Erratic | Fuel tank pressure sensor output voltage fluctuates frequently in certain time period. | ·
Fuel tank pressure sensor ·
Connector/wire harness (fuel tank pressure sensor - ECM) ·
ECM |
Comes on | SAE Code: P1451 |
| DTC No. | Monitoring Item | Detection Timing | Detection Logic | SAE Code |
|---|---|---|---|---|
| P145011 | Fuel tank pressure sensor voltage low | ·
EVAP monitoring (ignition switch off) ·
Ignition switch to ON |
1 trip | P1452 |
| P145015 | Fuel tank pressure sensor voltage high | P1453 | ||
| P14502A | Fuel tank pressure sensor constant voltage (Stuck monitor) | EVAP monitoring (ignition switch off) | 2 trip | P1451 |
| P14502F | Fuel tank pressure sensor abnormal voltage fluctuation (Noise monitor) | ·
EVAP monitoring (ignition switch off) ·
Ignition switch to ON |
DESCRIPTION
Refer to EVAP (Evaporative Emission) System.
MONITOR DESCRIPTION
P145011: Fuel tank pressure sensor voltage low
If the fuel tank pressure sensor output voltage (pressure) is less than 0.25 V: -17.18 kPa(gauge) -2.49 psi(gauge)], the ECM interprets this as an open or short circuit in the fuel tank pressure sensor or its circuit, and stops the EVAP system monitor. If any deterioration has occurred, the ECM will illuminate the MIL and store this DTC (1 trip detection logic).
P145015: Fuel tank pressure sensor voltage high
If the fuel tank pressure sensor output voltage (pressure) is higher than 4.95 V: 23.93 kPa(gauge) [3.47 psi(gauge)], the ECM interprets this as an open or short circuit in the pressure sensor or its circuit, and stops the EVAP system monitor. If any deterioration has occurred, the ECM will illuminate the MIL and store this DTC (1 trip detection logic).
P14502A: Fuel tank pressure sensor being constant (Stuck monitor)
If the fuel tank pressure sensor output voltage does not change, the ECM interprets this as the sensor voltage being constant, and stops the EVAP system monitor. The ECM then illuminates the MIL and stores this DTC (2 trip detection logic).
P14502F: Fuel tank pressure sensor abnormal voltage fluctuation (Noise monitor)
If the fuel tank pressure sensor output voltage fluctuates rapidly for 10 seconds, the ECM stops the EVAP system monitor. The ECM interprets this as the fuel tank pressure sensor voltage fluctuating, and stops the EVAP system monitor. The ECM then illuminates the MIL and stores the DTC.
MONITOR STRATEGY
| Required Sensors/Components | Fuel tank pressure sensor |
| Frequency of Operation | Once per driving cycle: P1451 (stuck monitor)
Continuous: P1451 (noise monitor), P1452 and P1453 |
CONFIRMATION DRIVING PATTERN
- NOTICE:
- ·
The Evaporative System Check (Automatic Mode) consists of 9 steps performed automatically by the GTS. It takes a maximum of approximately 40 minutes.
·Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable.
·Do not start the engine during this operation.
·When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor will from and any check result will be inaccurate. When performing the Evaporative System Check, keep the fuel temperature less than 35°C (95°F).
- HINT:
- ·
After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
·When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON [A].
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode [B].
After the "Evaporative System Check" is completed, check for All Readiness by entering the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P145011, P145015, P14502A or P14502F.
Check the DTC judgment result.
| GTS Display | Description |
|---|---|
| NORMAL | ·
DTC judgment completed ·
System normal |
| ABNORMAL | ·
DTC judgment completed ·
System abnormal |
| INCOMPLETE | ·
DTC judgment not completed ·
Perform driving pattern after confirming DTC enabling conditions |
- HINT:
- ·
If the judgment result is NORMAL, the system is normal.
·If the judgment result is ABNORMAL, the system is malfunctioning.
·[A] to [B]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
·When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
- 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 assembly.
·The GTS is required to conduct the following diagnostic troubleshooting procedure.
·Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.
(Select Powertrain in Health Check and then check the time stamp data.)
·If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.
PROCEDURE
Turn the ignition switch to ON (do not start the engine).
Read the DTCs.
- Powertrain > Engine > Trouble Codes
- 50001 372
Enter the following menus.
- Powertrain > Engine > Data List
-
Tester Display Vapor Pressure Fuel Tank Sensor - 50003 372 361
Read the fuel tank pressure displayed on the GTS.
- Result:
Display (DTC Output) Test Result Suspected Trouble Area Proceed to P145011 Less than -17.18 kPa(gauge) [-2.49 psi(gauge)] ·Wire harness/connector (fuel tank pressure sensor - ECM)
·Fuel tank pressure sensor
·Short in ECM circuit
A P145015 Higher than 23.93 kPa(gauge) [3.47 psi(gauge)] ·Wire harness/connector (fuel tank pressure sensor - ECM)
·Fuel tank pressure sensor
·Open in ECM circuit
B P14502A
P14502F- Fuel tank pressure sensor C
A
B
C
Turn the ignition switch off.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Result:
Tester Connection Condition Specified Condition Suspected Trouble Area Proceed to A47-55 (PTNK) - Body ground Always Below 10 Ω ·Wire harness/connector (fuel tank pressure sensor - ECM)
·Short in fuel tank pressure sensor circuit
A 10 kΩ or higher ·Wire harness/connector (fuel tank pressure sensor - ECM)
·Short in ECM circuit
B
A
B
Disconnect the fuel tank pressure sensor connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Result:
Tester Connection Condition Specified Condition Suspected Trouble Area Proceed to A47-55 (PTNK) - Body ground Always 10 kΩ or higher Short in fuel tank pressure sensor circuit A Below 10 Ω Wire harness/connector (fuel tank pressure sensor - ECM) B
A
B
| *a | Front view of wire harness connector
(to Fuel Tank Pressure Sensor) |
Disconnect the fuel tank pressure sensor connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Condition Specified Condition O226-3 (VC) - Body ground Ignition switch ON 4.75 to 5.25 V
Turn the ignition switch off.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition O226-1 (E2) - Body ground Always Below 10 Ω
- Result:
Result Suspected Trouble Area Proceed to Voltage and resistance within standard ranges Open in fuel tank pressure sensor circuit A Voltage and resistance outside standard ranges Open in wire harness/connector (fuel tank pressure sensor - ECM) B
A
B
- Result:
Proceed to NEXT
NEXT
- Result:
Proceed to NEXT
NEXT
- Result:
Proceed to NEXT
NEXT
Clear the DTCs.
- Powertrain > Engine > Clear DTCs
- 50002 372
Turn the ignition switch off and wait for at least 30 seconds.
- Result:
Proceed to NEXT
NEXT
Perform the Evaporative System Check using the GTS, referring to the Confirmation Driving Pattern.
Enter the following menus.
- Powertrain > Engine > Utility
-
Tester Display All Readiness - 50005 372 20
Input the DTC: P145011, P145015, P14502A or P14502F.
Check the DTC judgment result.
- Result:
GTS Display Description NORMAL ·DTC judgment completed
·System normal
ABNORMAL ·DTC judgment completed
·System abnormal
INCOMPLETE ·DTC judgment not completed
·Perform driving pattern after confirming DTC enabling conditions
- Result:
Proceed to NEXT
NEXT