EVAP system malfunction judgment

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

The WDS calculates the stored air pump load current value and displays the results as follows:
- Small leak results (DTC P0442) = LDP_SLDV
- Very small leak results (mA/S: DTC P0456) = LDP_VSLDV
- IMO result (air pump operation) = LDP_MON (when test ended)
- COV result (change-over-valve statues) = LDP_REF -LDP_IDL

Select the EVAP system test from the Toolbox on the WDS display and follow the instructions.

Verify that all of the following PIDs are within the specifications at the pre-test confirmation screen.

NOTE:

To successfully perform this procedure, all PIDs must be within the following specifications before proceeding to the next step.
Record the FTL_V and VPWR values.
The PCM will cancel the EVAP system test if the VPWR PID value falls lower than 11.0 V during the test.

PID SPECIFICATION

PID	PID Range
BARO	72.2 kPa {543 mmHg, 21.3 inHg} or more
FTL_V	1.3-3.7 V
LAF	5-40 °C {41-104 °F}
VPWR	11.0-14.5 V

Start the engine.
Drive the vehicle or let the engine idle more than 20 min.
Turn ignition switch Off, then turn it to the ON position again (Key On Engine Off).
Press the tick icon to start the test.
Verify that each test result is indicated with green.
- If any test result is indicated with red, diagnose the problem using the following DTC troubleshooting procedure or component inspection procedure.

DTC TROUBLESHOOTING

Failed Item	Troubleshooting
Small leak	DTC P0442
Very small leak (mA/S)	DTC P0456
IMO	Inspect, open or short to ground circuit between PCM and emission system leak detection pump
COV	Inspect change-over-valve to make sure it is not stuck closed