EVAP Purge Solenoid Circuit

Name of Code:
EVAP Purge Solenoid Circuit

When Monitored:
With the ignition key on and the engine running.

Set Condition:
After the arming conditions are satisfied: not powering down, not already in limp-in, time since the last solenoid activation 72 micro seconds. The powertrain control module will set a trouble code if the actual state of the solenoid does not match the intended state.

Theory of Operation:
The purge solenoid regulates -- by means of a duty cycle -- the flow of vapors from the EVAP canister to the throttle body. The PCM controls the time the solenoid is on during a duty cycle. During off idle operations (higher flows), higher percentages of duty cycle are used. At idle (lower flow), lower percentages of duty cycle are used.

Possible Causes:
- Open or shorted control circuit
- Open fused ignition switch output circuit
- Open or shorted solenoid control coil
- Powertrain control module failure
- Connector terminals
- Connector wires