Subaru Crosstrek manuals

Subaru Crosstrek Service Manual: Dtc p0451 evap system (cpc) pressure sensor/switch circuit range/performance

Subaru Crosstrek Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0451 evap system (cpc) pressure sensor/switch circuit range/performance

ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0451 EVAP SYSTEM (CPC) PRESSURE SENSOR/SWITCH CIRCUIT RANGE/PERFORMANCE

DTC detecting condition:

Detected when two consecutive driving cycles with fault occur.

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION">, and Inspection Mode Inspection Mode > PROCEDURE">.

STEPCHECKYESNO

1.CHECK FOR ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

Check the appropriate DTC using the “List of Diagnostic Trouble Code (DTC)”. List of Diagnostic Trouble Code (DTC)">

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0451 EVAP SYSTEM (CPC) PRESSURE SENSOR/SWITCH CIRCUIT RANGE/PERFORMANCE">Go to Step 2.

2.CHECK CURRENT DATA.

1) Turn the ignition switch to ON (engine OFF).

2) Using the Subaru Select Monitor or general scan tool, read the value in «Absolute Evap Sys. Pressure» and «Mani. Absolute Pressure», and compare them with the actual atmospheric pressure.

NOTE:

Subaru Select Monitor

For detailed operation procedures, refer to “Current Data Display For Engine”. Subaru Select Monitor">

General scan tool

For detailed operation procedures, refer to the general scan tool operation manual.

To read the actual atmospheric pressure, connect the Subaru Select Monitor or general scan tool to the other known good vehicle.

Is the difference with the actual atmospheric pressure 2.4 kPa (18 mmHg, 0.7 inHg) or more?

Replace the part that showed larger deviation from the actual atmospheric pressure than the other.

If deviations in value for «Absolute Evap Sys. Pressure» is larger: Replace the leak check valve assembly. Leak Check Valve Assembly">

If deviations in value for «Mani. Absolute Pressure» is larger: Replace the manifold absolute pressure sensor. Manifold Absolute Pressure Sensor">

Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

NOTE:

In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

1. OUTLINE OF DIAGNOSIS

Detect the output characteristics malfunction of Evaporative Leak Check Module pressure sensor.

Judge as NG when the Evaporative Leak Check Module pressure sensor output value is largely different from the intake manifold pressure when the ignition switch is ON.

2. COMPONENT DESCRIPTION

(1)

Leak check valve ASSY

(5)

Vacuum pump

(9)

Fuel tank

(2)

Switching valve

(6)

Drain filter

(10)

Canister

(3)

Reference orifice (0.02 inch orifice)

(7)

Purge control solenoid valve

(4)

Pressure sensor

(8)

Intake manifold

3. EXECUTION CONDITION

Secondary parameters

Execution condition

Elapsed time after ignition switch is turned to ON

≥ 500 ms

and

< 60000 ms

Soaking time

≥ 60 s

Evaporative Leak Check Module vacuum pump

Not in operation

Evaporative Leak Check Module switching valve

Open

Purge control

Not in operation

4. GENERAL DRIVING CYCLE

Perform the diagnosis once at ignition ON.

5. DIAGNOSTIC METHOD

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment value

Malfunction Criteria

Threshold Value

Absolute value

(Evaporative Leak Check Module pressure sensor output value − intake manifold pressure (absolute pressure) when ignition switch is ON)

> 4.7 kPa (35.5 mmHg, 1.4 inHg)

Time needed for diagnosis: 320 ms

Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Dtc p0441 evap system (cpc) incorrect purge flow
ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC P0441 EVAP SYSTEM (CPC) INCORRECT PURGE FLOWDTC DETECTING CONDITION:Detected when two consecutive driving cyc ...

Dtc p0452 evap system (cpc) pressure sensor/switch circuit low
ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC P0452 EVAP SYSTEM (CPC) PRESSURE SENSOR/SWITCH CIRCUIT LOWDTC detecting condition:Immediately at fault recogn ...

Other materials:

Wiring diagram
SECURITY AND LOCKS > Security SystemWIRING DIAGRAMRefer to “Security System” in the wiring diagram.• Model without push button start: Security System > WIRING DIAGRAM">• Model with push button start: Security System > WIRING DIAGRAM"> ...

Dtc p062f internal control module eeprom error
ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC P062F INTERNAL CONTROL MODULE EEPROM ERRORNOTE:For the diagnostic procedure, refer to DTC P0606. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0606 CONTROL MODULE PROCESSOR">1. OUT ...

Dtc b1795 occupant detection module internal circuit
OCCUPANT DETECTION SYSTEM (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC B1795 OCCUPANT DETECTION MODULE INTERNAL CIRCUITDIAGNOSIS START CONDITION:Ignition voltage is 8 V to 16 V.DTC DETECTING CONDITION:Occupant detection control module is faulty.When “DTC B1795 ...

© 2016-2020 Copyright www.sucross.com