EMISSION SYSTEM
01–16–13
01–16
EVAP SYSTEM LEAK DETECTION PUMP DESCRIPTION
CHU011618743S01
Function
• The internal pump pressurizes the emission system by pumping air to check clogging and leakage in the
emission system.
Structure
• Orifice
— Has a 0.5 mm {0.02 in} hole
• Pump
— Force-feeds air to the orifice and the EVAP lines
• Heater
— Removes moisture inside the pump
• Change over valve
— Operated by a solenoid valve to switch air passages
Operation
Evaporative system monitor is not operated
• The passage between the canister and the air
filter is connected.
B6U0116S028
SOLENOID IS OFF AND PUMP IS NOT OPERATED
DURING PURGE SYSTEM OPERATION
FROM AIR
FILTER
TO CHARCOAL
CANISTER
CHANGE OVER VALVE
(CLOSED)
EVAP SYSTEM LEAK
DETECTION PUMP
: AIR FLOW
B6U0116S017
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