DTC Confirmation Test (Overall Function Check)

NOTE: Use the following test to check overall function of EVAP purge flow monitoring system. During this test, DTC may not be confirmed.

Malfunction is detected when EVAP system is not functioning properly or there is a leak in hose between EVAP Control System Pressure Sensor (EVAP-CSPS) and intake manifold. Possible causes are:

EVAP Canister Purge Volume Control Solenoid Valve (EVAP-CPVCSV) stuck closed.
Faulty EVAP-CSPS or circuit.
Blockage or leak in hoses.
EVAP canister cracked.
Fault in EVAP-CPVCSV circuit.
Defective closed Throttle Position (TP) switch.
Plugged purge port.
Defective EVAP Canister Vent Control Valve (EVAP-CVCV).

Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and wait at least 70 seconds. Using a DVOM, backprobe ECM harness connector and measure voltage between ground and terminal No. 84 (Pink wire) at ECM harness connector. See Figure. Note voltage reading at idle. Raise drive wheels and support vehicle. While monitoring voltage, maintain the following conditions for at least one minute:

A/C on.
Steering wheel turned fully.
Headlights on.
Rear window defogger on.
Engine speed at 3000 RPM.
Transmission in any forward gear.

Ensure voltage remains .1 volt less than voltage measured at idle for at least one second. If voltage is not as specified, perform DIAGNOSTIC PROCEDURE . If voltage is as specified, problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.