DTC P0442:00, P0455:00, P0456:00 [SKYACTIV-G 2.5]

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2014 - Mazda6 - Engine

DTC P0442:00, P0455:00, P0456:00 [SKYACTIV-G 2.5]

NOTE:

To determine the malfunctioning part, proceed with the diagnostics from "Function Inspection Using M-MDS".

Details On DTCs


DESCRIPTION	P0442:00 Evaporative gas leakage (leakage amount: low) P0455:00 Evaporative gas leakage (leakage amount: large) P0456:00 Evaporative gas leakage (leakage amount: extremely low)
DETECTION CONDITION	Determination conditions	P0442:00 Hole of 0.04 in (1.0 mm) or more in evaporative gas passage
		P0455:00 Hole of 0.09 in (2.25 mm) or more in evaporative gas passage
		P0456:00 Hole of 0.02 in (0.5 mm) or more in evaporative gas passage
	Preconditions	P0442:00, P0455:00 Period ignition is switched off before engine starts: 120 min or more Engine coolant temperature at engine start: 2—43 °C {36—109 °F}^1 Time elapsed from engine start: 6—90 min* Fuel level in fuel tank: 10—90 %^1 Desired ambient air temperature: 4.4—43.3 °C {40—109 °F}^1 Barometric pressure: 72.23 kPa {0.7365 kgf/cm², 10.48 psi} or more^1 Charging efficiency: 3—65 %^1 Vehicle speed: 64—144 km/h {40.0—89.4 mph}^1 P0456:00 Engine coolant temperature at engine start: 2—43 °C {36—109 °F}^1 Intake air temperature at engine start: 7 °C {13 °F} or more higher than engine coolant temperature at engine start^1 Time elapsed from engine start: 15—90 min* Fuel level in fuel tank: 10—90 %^1 Desired ambient air temperature: 5—37 °C {41—98 °F}^1 Barometric pressure: 72.35 kPa {0.7378 kgf/cm², 10.49 psi} or more^1 Battery voltage: above 10 V^1 The following DTCs are not detected: Fuel tank pressure sensor: P0451:00, P0452:00, P0453:00 Purge solenoid valve: P0443:00 CV solenoid valve: P0446:00 EVAP monitor: P0442:00, P0455:00, P0457:00, P144A:00, P1450:00 Fuel gauge sender unit: P0460:00, P0461:00, P0462:00, P0463:00 ^*1: Value can be verified by displaying PIDs using M-MDS
	Malfunction determination period	75 s period
	Drive cycle	1
	Self test type	CMDTC self test
	Sensor used	Fuel tank pressure sensor
FAIL-SAFE FUNCTION	Not applicable
VEHICLE STATUS WHEN DTCs ARE OUTPUT	Illuminates check engine light.
POSSIBLE CAUSE	Missing or loose fuel filler cap Fuel filler cap malfunction Fuel tank pressure sensor malfunction CV solenoid valve malfunction Purge solenoid valve malfunction Evaporative gas passage malfunction Improper connection of evaporative hose Evaporative hose damaged Charcoal canister malfunction Catch tank malfunction Fuel pump unit loose Fuel tank malfunction PCM malfunction

System Wiring Diagram

Not applicable

Function Explanation (DTC Detection Outline)

The pressure change of the evaporative gas passage is measured using barometric pressure and intake manifold vacuum to detect evaporative gas leakage. The PCM introduces barometric pressure or intake manifold vacuum into the evaporative gas passage by opening/closing the purge solenoid valve and CV solenoid valve, and measures the pressure change using the fuel tank pressure sensor.

P0455:00

The PCM closes the CV solenoid valve while the vehicle is being driven, and seals the fuel tank. The PCM introduces intake manifold vacuum into the fuel tank and measures the pressure change of the fuel tank using the fuel tank pressure sensor by opening the purge solenoid valve after sealing the fuel tank. If the pressure of the fuel tank does not reach the target value after the specified time has elapsed since the pressure was measured, the PCM determines that there is an evaporative gas leakage. If the PCM determines that refueling is not performed before the engine starts according to the result of the refuel determination, DTC P0455:00 is stored (if the PCM determines that refueling is performed, DTC P0457:00 is stored).

If the fuel tank level increases after the engine starts, the PCM determines that refueling was performed by comparing the fuel tank level before one drive cycle with the fuel tank level after engine start.

P0442:00

The PCM closes the purge solenoid valve after diagnosing (normal) DTC P0455:00, and seals the fuel tank. The pressure change of the fuel tank is measured by the fuel tank pressure sensor after the fuel tank is sealed. The PCM determines a temporary malfunction if the pressure change is the specified value or more after the specified time has elapsed since the pressure was measured. If the CV solenoid valve is open after determining a temporary malfunction and the pressure change (increase) of the fuel tank is the specified value or less, the PCM determines that there is an evaporative gas leakage and a DTC is stored.

P0456:00

After the engine stops with the preconditions met, the PCM closes the CV solenoid valve and seals the fuel tank. The pressure change of the fuel tank is measured by the fuel tank pressure sensor after the fuel tank is sealed. The PCM determines a temporary malfunction when the pressure change is the specified value or less after the specified time has elapsed since the pressure was measured. If the CV solenoid valve is open after determining a temporary malfunction and the pressure change of the fuel tank is the specified value or less, the PCM determines that there is an evaporative gas leakage and a DTC is stored.

Repeatability Verification Procedure

P0442:00, P0455:00

Set the remaining fuel quantity in the fuel tank between 30—85 %.

Start the engine and switch the ignition off after 5 s have elapsed.

Leave the vehicle for 6 hours or more.

Start the engine and leave it idling for 2 min.

Drive the vehicle for 30 min at a speed of 50 km/h {31 mph} or more (to increase temperature in fuel tank and generate evaporative gas).

NOTE:

If driving the vehicle for 30 min at a speed of 50 km/h {31 mph} or more is not feasible, the vehicle can be driven for a continuous 15 min or more with the engine coolant temperature at 80 °C {176 °F} or more.

P0456:00

Set the remaining fuel quantity in the fuel tank between 30—85 %.

Verify that OBD-II information (such as FREEZE FRAME DATA (Mode 2)) has been obtained and recorded.

Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-G 2.5].)

Start the engine and switch the ignition off after 5 s have elapsed.

Leave the vehicle for 6 hours or more.

Start the engine and leave it idling for 2 min.

Drive the vehicle for 30 min at a speed of 50 km/h {31 mph} or more (to increase temperature in fuel tank and generate evaporative gas).

NOTE:

If driving the vehicle for 30 min at a speed of 50 km/h {31 mph} or more is not feasible, the vehicle can be driven for a continuous 15 min or more with the engine coolant temperature at 80 °C {176 °F} or more.

Stop the engine.

Leave the vehicle for 1 hours or more.

PID Item/Simulation Item Used In Diagnosis

PID/DATA monitor item table


Item	Definition	Unit	Condition/Specification
BARO	Barometric pressure	KPa {MPa}, mBar {Bar}, psi, in H20	Displays BARO
BARO	Barometric pressure	V	Ignition switched ON (at sea level): Approx. 4.08 V
EVAPCP	Purge solenoid valve control signal	%	Idle (after warm up): Approx. 0% Racing (Engine speed 2,000 rpm): 4.3—35% Racing (Engine speed 4,000 rpm): Approx. 66%
EVAPCV	CV solenoid valve control signal	Off/On	Simulation item (EVAPCV) is ON: On
FCL	Check fuel cap warning light	Off/On	Check fuel cap warning light not illuminate: Off Check fuel cap warning light illuminate: On
FTP	Fuel tank pressure	Pa {KPa} {MPa}, mBar {Bar}, psi, in H20	Displays fuel tank pressure
FTP	Fuel tank pressure	V	Fuel tank pressure is equal to barometric pressure: Approx. 2.6 V

Function Inspection Using M-MDS


STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	PURPOSE: RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?	Yes	Go to the next step.
2		No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step. NOTE: Recording can be facilitated using the screen capture function of the PC.
3	PURPOSE: VERIFY IF DIAGNOSTIC RESULT IS AFFECTED BY MALFUNCTION OF CONTROL PART REQUIRED FOR DIAGNOSIS Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) Is the PENDING CODE/DTC P0443:00, P0446:00, P0451:00, P0452:00 or P0453:00 also present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC P0443:00 [SKYACTIV-G 2.5].) (See DTC P0446:00 [SKYACTIV-G 2.5].) (See DTC P0451:00 [SKYACTIV-G 2.5].) (See DTC P0452:00 [SKYACTIV-G 2.5].) (See DTC P0453:00 [SKYACTIV-G 2.5].)
3		No	P0442:00 or P0455:00 is diagnosed: Go to the next step. P0456:00 is diagnosed: Go to Step 4.
4	PURPOSE: INSPECTION OF EVAPORATIVE GAS LEAKAGE Perform the Evaporative Emission (EVAP) System Leak Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [SKYACTIV-G 2.5].) Is evaporative gas leakage detected?	Yes	Go to Step 5.
4		No	Go to Step 8.
5	PURPOSE: INSPECTION OF EVAPORATIVE GAS LEAKAGE Perform the smoke test using the SST (134-01049). Is evaporative gas leakage detected?	Yes	Go to the next step.
5		No	Go to Step 8.
6	PURPOSE: VERIFY FUEL FILLER CAP MALFUNCTION Access the FCL PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) Is the FCL PID value On?	Yes	Go to the troubleshooting procedure to perform the procedure from Step 1.
6		No	Go to the next step.
7	PURPOSE: SPECIFY LOCATION OF EVAPORATIVE GAS LEAKAGE (FUEL TANK SIDE) Disconnect the evaporative hose of the following: (See QUICK RELEASE CONNECTOR (EMISSION SYSTEM) REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) Between charcoal canister and purge solenoid valve (charcoal canister side) Between charcoal canister and CV solenoid valve (charcoal canister side) Plug the charcoal canister. Open the fuel-filler cap. Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) BARO FTP Does the FTP PID value correspond to the BARO PID value?	Yes	Go to the next step.
7		No	Go to the troubleshooting procedure to perform the procedure from Step 3.
8	PURPOSE: SPECIFY LOCATION OF EVAPORATIVE GAS LEAKAGE (CHARCOAL CANISTER SIDE) Reconnect all the removed parts. Disconnect the evaporative hose of the following: (See QUICK RELEASE CONNECTOR (EMISSION SYSTEM) REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) Between charcoal canister and purge solenoid valve (purge solenoid valve side) Between charcoal canister and CV solenoid valve (CV solenoid valve side) Plug the evaporative hoses (purge solenoid valve side and CV solenoid valve side). Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) BARO FTP Does the FTP PID value correspond to the BARO PID value?	Yes	Go to the next step.
8		No	Go to the troubleshooting procedure to perform the procedure from Step 6.
9	PURPOSE: DETERMINE IF MALFUNCTION CAUSED BY CONTROL PART (PURGE SOLENOID VALVE) REQUIRED FOR DIAGNOSIS Reconnect all the removed parts. Start the engine and idle it. Access the EVAPCP PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) Is the EVAPCP PID value normal? (See PCM INSPECTION [SKYACTIV-G 2.5].)	Yes	Go to the next step.
9		No	Go to the troubleshooting procedure to perform the procedure from Step 9.
10	PURPOSE: DETERMINE IF MALFUNCTION CAUSED BY CONTROL PART (CV SOLENOID VALVE) REQUIRED FOR DIAGNOSIS Start the engine and idle it. Access the EVAPCV PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) Is the EVAPCV PID value normal? (See PCM INSPECTION [SKYACTIV-G 2.5].)	Yes	Go to the next step.
10		No	Go to the troubleshooting procedure to perform the procedure from Step 10.
11	PURPOSE: DETERMINE IF MALFUNCTION CAUSED BY CONTROL PART (FUEL TANK PRESSURE SENSOR) REQUIRED FOR DIAGNOSIS Start the engine and idle it. Access the FTP PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) Is the FTP PID value normal? (See PCM INSPECTION [SKYACTIV-G 2.5].)	Yes	Go to the troubleshooting procedure to perform the procedure from Step 1.
11		No	Go to the troubleshooting procedure to perform the procedure from Step 11.

Troubleshooting Diagnostic Procedure

Intention of troubleshooting procedure

Step 1—2

Inspect for evaporative gas leakage from the fuel-filler opening.

Step 3—5

Inspect for evaporative gas leakage from the fuel tank side.

Step 6—8

Inspect for evaporative gas leakage from the charcoal canister side.

Step 9—11

Inspect control parts for normal operation.

Step 12—13

Verify that the primary malfunction is resolved and there are no other malfunctions.


STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: INSPECTION OF EVAPORATIVE GAS LEAKAGE FROM FUEL-FILLER CAP Verify that the fuel-filler cap is completely closed. Is the fuel-filler cap completely closed?	Yes	Go to the next step.
1		No	Close the fuel-filler cap completely, then go to Step 12.
2	PURPOSE: DETERMINE INTEGRITY OF FUEL FILLER CAP Inspect the fuel filler cap. Is there any malfunction?	Yes	Replace the fuel filler cap, then go to Step 12. (See FUEL-FILLER PIPE REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)
2		No	Go to the next step.
3	PURPOSE: INSPECTION OF EVAPORATIVE GAS LEAKAGE FROM EVAPORATIVE GAS PASSAGE Verify the hoses between the following parts, pipe connection condition, and that there is no cracking or damage. Between fuel tank and charcoal canister Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 12.
3		No	Go to the next step.
4	PURPOSE: INSPECTION OF EVAPORATIVE GAS LEAKAGE CAUSED BY POOR INSTALLATION OF FUEL PUMP Verify the fuel pump unit installation condition (clearance between affixing surfaces, installation angle). (See FUEL PUMP UNIT REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) Is the fuel pump unit installed securely?	Yes	Go to the next step.
4		No	Retighten the fuel pump unit, then go to Step 12. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)
5	PURPOSE: DETERMINE INTEGRITY OF FUEL TANK Inspect the fuel tank. (See FUEL TANK INSPECTION [SKYACTIV-G 2.5].) Is there any malfunction?	Yes	Replace the fuel tank, then go to Step 12. (See FUEL TANK REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)
5		No	Go to the next step.
6	PURPOSE: INSPECTION OF EVAPORATIVE GAS LEAKAGE FROM EVAPORATIVE GAS PASSAGE Verify the hoses between the following parts, pipe connection condition, and that there is no cracking or damage. Between charcoal canister and catch tank Between charcoal canister and CV solenoid valve Between catch tank and purge solenoid valve Between purge solenoid valve and intake manifold Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 12.
6		No	Go to the next step.
7	PURPOSE: DETERMINE INTEGRITY OF CHARCOAL CANISTER Inspect the charcoal canister. (See CHARCOAL CANISTER INSPECTION [SKYACTIV-G 2.5].) Is there any malfunction?	Yes	Replace the charcoal canister, then go to Step 12. (See CHARCOAL CANISTER REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)
7		No	Go to the next step.
8	PURPOSE: DETERMINE INTEGRITY OF CATCH TANK Inspect the catch tank. (See CATCH TANK INSPECTION [SKYACTIV-G 2.5].) Is there any malfunction?	Yes	Replace the catch tank, then go to Step 12. (See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)
8		No	Go to the next step.
9	PURPOSE: DETERMINE INTEGRITY OF PURGE SOLENOID VALVE Inspect the purge solenoid valve. (See PURGE SOLENOID VALVE INSPECTION [SKYACTIV-G 2.5].) Is there any malfunction?	Yes	Replace the purge solenoid valve, then go to Step 12. (See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)
9		No	Go to the next step.
10	PURPOSE: DETERMINE INTEGRITY OF CV SOLENOID VALVE Inspect the CV solenoid valve. (See CANISTER VENT (CV) SOLENOID VALVE INSPECTION [SKYACTIV-G 2.5].) Is there any malfunction?	Yes	Replace the CV solenoid valve, then go to Step 12. (See CANISTER VENT (CV) SOLENOID VALVE REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)
10		No	Go to the next step.
11	PURPOSE: DETERMINE INTEGRITY OF FUEL TANK PRESSURE SENSOR Inspect the fuel tank pressure sensor. (See FUEL TANK PRESSURE SENSOR INSPECTION [SKYACTIV-G 2.5].) Is there any malfunction?	Yes	Replace the charcoal canister, then go to the next step. (See CHARCOAL CANISTER REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)
11		No	Go to the next step.
12	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION Reconnect all the removed parts. Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-G 2.5].) Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) Is the same DTC present?	Yes	Repeat the inspection from Step 1 of the troubleshooting diagnostic procedure. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) Go to the next step.
12		No	Go to the next step.
13	PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION Is any other DTC or pending code stored?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 2.5].)
13		No	DTC troubleshooting completed.

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