P0451

FA20 ENGINE CONTROL: SFI SYSTEM: P0451-P0453; Evaporative Emission Control System Pressure Sensor Range / Performance; 2013 MY FR-S [03/2012 -]
P0451 - Evaporative Emission Control System Pressure Sensor Range / Performance
P0452 - Evaporative Emission Control System Pressure Sensor / Switch Low Input
P0453 - Evaporative Emission Control System Pressure Sensor / Switch High Input

DTC SUMMARY





HINT
The canister pressure sensor is built into the canister pump module.

DESCRIPTION

The description can be found in EVAP (Evaporative Emission) System EVAP System.

MONITOR DESCRIPTION





1. DTC P0451: Difference between canister pressure sensor output value and manifold absolute pressure sensor output value

If the difference between the atmospheric pressure calculated using the canister pressure sensor and that calculated using the MAP sensor exceeds the specified value, then the ECM determines there is a canister pressure sensor abnormality. The ECM then illuminates the MIL and stores the DTC (2 trip detection logic).

2. DTC P0452: Canister pressure sensor voltage low

If the canister pressure sensor voltage output (pressure) is below 0.973 V: 51.71 kPa(abs) [388 mmHg(abs)], the ECM interprets this as an open or short circuit in the canister pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and stores the DTC (1 trip detection logic).

3. DTC P0453: Canister pressure sensor voltage high

If the canister pressure sensor voltage output (pressure) is 4.095 V: 108.99 kPa(abs) [818 mmHg(abs)] or more, the ECM interprets this as an open or short circuit in the canister pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and stores the DTC (1 trip detection logic).

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All





P0451





P0452, P0453





TYPICAL MALFUNCTION THRESHOLDS

P0451





P0452





P0453





COMPONENT OPERATING RANGE





MONITOR RESULT

Refer to Checking Monitor Status Mode 6 Data.

CONFIRMATION DRIVING PATTERN

NOTICE:
* The Evaporative System Check (Automatic Mode) consists of 5 steps performed automatically by the Techstream. It takes a maximum of approximately 24 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 run the engine during this operation.
* When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F) and the coolant temperature below 45°C (113°F).

1. Connect the Techstream to the DLC3.

2. Turn the ignition switch to ON and turn the Techstream on.

3. Enter the following menus: Powertrain / Engine / Data List / Intake Air.

4. Check that the intake air temperature is between 4.4 and 35°C (40 and 95°F).

5. Clear DTCs (even if no DTCs are stored, perform the clear DTC procedure) Reading and Clearing Diagnostic Trouble Codes.

6. Turn the ignition switch off and wait for at least 30 seconds.

7. Turn the ignition switch to ON and turn the Techstream on.

8. Enter the following menus: Powertrain / Engine / Utility / All readiness.

9. Input the DTC: P0451, P0452 or P0453.

10. Check the DTC judgment result.





HINT
* If the judgment result shows NORMAL, the system is normal.
* If the judgment result shows ABNORMAL, the system has a malfunction.

11. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
* If a permanent DTC is output, the system is malfunctioning.
* If no permanent DTC is output, the system is normal.

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 cap.
* Do not disassemble the canister pump module.
* The Techstream is required to conduct the following diagnostic troubleshooting procedure.
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. CONFIRM DTC AND EVAP PRESSURE

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON (do not start the engine).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Read DTCs.

(f) Enter the following menus: Powertrain / Engine / Data List / Vapor Pressure Pump.

(g) Read the EVAP (Evaporative Emission) pressure displayed on the Techstream.

Result





B -- CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)

C -- READ VALUE USING TECHSTREAM (ATMOSPHERE PRESSURE)
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)

(a) Turn the ignition switch off.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Result





B -- READ VALUE USING TECHSTREAM (ATMOSPHERE PRESSURE)
A -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)

(a) Disconnect the canister pump module connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Result





A -- REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER PUMP MODULE - ECM)

B -- REPLACE ECM

4. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)

(a) Disconnect the canister pump module connector.









(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(c) Turn the ignition switch to ON.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Result





B -- REPLACE ECM
A -- Continue to next step.

5. REPLACE CANISTER PUMP MODULE

(a) Replace the canister pump module Removal.

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

6. REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER PUMP MODULE - ECM)

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

7. REPLACE ECM

(a) Replace the ECM Removal.

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

8. READ VALUE USING TECHSTREAM (ATMOSPHERE PRESSURE)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / Atmosphere Pressure.

(e) Compares Atmosphere Pressure displayed with the Techstream to the actual atmosphere pressure.

Result





B -- REPLACE CANISTER PUMP MODULE
A -- Continue to next step.

9. READ VALUE USING TECHSTREAM (MAP)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / MAP.

(e) Compares the MAP displayed with the Techstream to the actual atmosphere pressure.

Result





B -- REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

A -- CHECK INTERMITTENT PROBLEMS Check For Intermittent Problems

10. REPLACE CANISTER PUMP MODULE

(a) Replace the canister pump module Removal.

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

11. REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

(a) Replace the manifold absolute pressure sensor Removal.

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

12. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(e) Turn the ignition switch off and wait for at least 60 seconds.

(f) Turn the ignition switch to ON.

(g) Turn the Techstream on.

(h) Perform the Evaporative System Check using the Techstream, referring to the Confirmation Driving Pattern.

(i) Enter the following menus: Powertrain / Engine / Utility / All Readiness.

(j) Input the DTC: P0451, P0452 or P0453.

(k) Check the DTC judgment result.

Result





NEXT -- END