Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC Confirmation Test (Overall Function Check)
Malfunction is detected when EVAP system is not functioning properly or there is a leak in hose between EVAP-CSPS and intake manifold. Possible causes are:
- EVAP Canister Purge Volume Control Valve (EVAP-CPVCV) stuck closed.
- Faulty EVAP Control System Pressure Sensor (EVAP-CSPS) or circuit.
- Leak or blockage in EVAP-CSPS hose.
- EVAP canister cracked.
- Defective closed throttle position switch.
- Plugged purge port.
- Defective EVAP Canister Vent Control Valve (EVAP-CVCV).
- To check overall function of EVAP purge flow monitoring system, raise drive wheels and support vehicle. Start engine and warm to normal operating temperature. Ensure Traction Control System (TCS) is turned off. Turn ignition off and wait at least 10 seconds.
- Start engine and wait at least 70 seconds. With engine idling, measure and record voltage between ground and ECM terminal No. 84 (EVAP-CSPS signal) by backprobing. See Figure and Figure .
- With transmission in a forward gear, turn A/C headlights and rear window defogger on. Hold steering wheel in the fully turned position. Increase engine speed to about 3000 RPM.
- While observing voltmeter, maintain conditions in step 3 for at least one minute. Voltage should remain .1 volt less than voltage measured at idle. If voltage is not as specified, go to PROCEDURE .
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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