DTC Confirmation Test (Using Generic Scan Tool)

NOTE: Use the following test to check overall function of EVAP control system purge flow monitoring. During this test, 1st trip DTC may not be confirmed.

Raise and support vehicle with drive wheels off the ground. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 5 seconds.
Start engine and wait at least 70 seconds. Measure and record voltage between ground and EVAP-CSPS signal circuit at ECM terminal No. 62 (Yellow wire) by backprobing. See Figure . See Figure or Figure .
While monitoring voltage, maintain the following conditions for at least one minute:
- A/C switch: ON position.
- Headlight switch: ON position.
- Rear window defogger switch: ON position.
- Engine speed: about 3000 RPM.
- Transmission: any forward gear.
Voltage should remain 0.1 volt less than voltage measured at idle for at least one second.
If voltage is as specified, system is okay at this time. If voltage is not as specified, go to DIAGNOSTIC PROCEDURE .