EGR Solenoid Valve
Operation
The EGR solenoid is a duty-control type of solenoid valve; it performs its control function by leaking the EGR valve-activation vacuum to the throttle body A port.
Battery power supply is supplied, by way of the multiport fuel Injection, to the EGR solenoid. When the engine control module switches OFF the power transistor within the unit, current stops flowing to the coil, and the EGR valve-activation negative pressure leaks.
Troubleshooting Hints
If the diagnostic trouble code for EGR system malfunction is output even though the results of checking the EGR solenoid harness and the component itself are normal, check the EGR valve, the vacuum hose piping, and the EGR passage for clogging.
Inspection
Harness Inspection
EGR SOLENOID
NOTE: When disconnecting the vacuum hose, make an identification mark on it so that it can be reconnected to the original position.
(1) Disconnect the vacuum hoses (yellow and green stripe) from the solenoid valve.
(2) Disconnect the harness connector.
(3) Connect a hand vacuum pump to the nipple to which the green-striped vacuum hose was connected.
(4) Apply a vacuum and check for air-tightness when Voltage applied directly to the EGR solenoid when the Voltage is discontinued.
(5) Measure the resistance between the terminals of the solenoid valve.
Standard value: 36-44 Ohms [at 20°C (68°F)]