DTC P0499: Evaporative Emission Control System Ventilation Control Valve Circuit High Input
CIRCUIT OPERATION
- The evaporative emission ventilation solenoid power is supplied from the MFI relay.
- The ECM controls ground evaporative emission ventilation solenoid by turning the power transistor in the ECM "ON" and "OFF".
TECHNICAL DESCRIPTION
In response to a signal from the ECM, the evaporative emission ventilation solenoid valve controls the flow rate of the ventilation air to be introduced into the intake manifold.
DESCRIPTIONS OF MONITOR METHODS
The ECM detects short malfunction.
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
Sensor (The sensor below is determined to be normal)
DTC SET CONDITIONS
Check Conditions
- Engine is running.
- Battery positive voltage is between 10 and 16.5 volts.
Judgment Criterion
- The coil current is more than 2.3 amperes with the evaporative emission ventilation solenoid driving for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
OBD-II DRIVE CYCLE PATTERN
- Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )
- Evaporative emission ventilation solenoid failed.
- Open or shorted evaporative emission ventilation solenoid circuit, harness damage or connector damage.
- ECM failed.