DTC P0457:00 [PCM (SKYACTIV-G 2.0)]

2016 – MX-5 – Engine

NOTE:

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

DESCRIPTION	Fuel-filler cap installation malfunction
DETECTION CONDITION	Determination conditions	Hole of 0.09 in (2.25 mm) or more in evaporative gas passage
	Preconditions	Period ignition is switched off before engine starts: 120 min or more Engine coolant temperature at engine start: 1.67—43.00 °C {35.1—109.0 °F}^1 Time elapsed from engine start: 5.5—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—144.8 km/h {40.00—89.97 mph}^1 When refueling (determines that refueling was performed by comparing fuel tank level before one drive cycle with fuel tank level at engine start) ^1: Value can be verified by displaying PIDs using M-MDS
	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 fuel cap warning light (DTC P0457:00 detected). Illuminates check engine light (after two drive cycle since P0457:00 was detected).
POSSIBLE CAUSE	Missing or loose fuel filler cap Fuel filler cap malfunction PCM malfunction

The PCM closes the purge solenoid valve and CV solenoid valve while the vehicle is being driven, and seals the fuel tank. By opening the purge solenoid valve after sealing the fuel tank, evaporative gas in the fuel tank is inducted into the intake manifold, fuel tank pressure is reduced, and the pressure change of the fuel tank is measured by the fuel tank pressure sensor. If the pressure of the fuel tank does not reach the target vacuum 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 was performed before the engine starts, according to the result of the refueling determination, the PCM determines that the fuel-filler cap is open and stores DTC P0457:00 (if PCM determines that refueling is not performed, it stores DTC P0455:00).
If the fuel tank level increases after the engine starts, the PCM determines that refueling is performed by comparing the fuel tank level before one drive cycle with the fuel tank level after engine start.

Set the remaining fuel quantity in the fuel tank between 30—85 %.
Verify that OBD-II information (such as FREEZE FRAME DATA) has been obtained and recorded.
Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [PCM (SKYACTIV-G 2.0)].)
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/DATA monitor item table

Item	Definition	Unit	Condition/Specification
FCL	Check fuel cap warning light illumination status	Off/On	Check fuel cap warning light not illuminated: Off Check fuel cap warning light illuminated: On

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 FREEZE FRAME DATA/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS TO UTILIZE WITH REPEATABILITY VERIFICATION NOTE: Recording can be facilitated using the screen capture function of the PC. Record the FREEZE FRAME DATA/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (EVAP system related) on the repair order.	—	Go to the next step.
3	PURPOSE: VERIFY FUEL FILLER CAP MALFUNCTION Access the FCL PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].) Is the FCL PID value On?	Yes	Go to the troubleshooting procedure to perform the procedure from Step 1.
3		No	Go to the troubleshooting procedure to perform the procedure from Step 2.

Intention of troubleshooting procedure

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 3.
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 the next step. (See FUEL-FILLER PIPE REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
2		No	Go to the next step.
3	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 [PCM (SKYACTIV-G 2.0)].) Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].) 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 2.0].) Go to the next step.
3		No	Go to the next step.
4	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 [PCM (SKYACTIV-G 2.0)].)
4		No	DTC troubleshooting completed.