Question about 2005 Dodge Caravan
How do I go about checking the EGR valve and circuit? At $100, I don't just want to replace the valve if it isn't bad.
Use a mityvac or equivalent handheld vacuum device and while running engine apply vacuum to EGR valve (disconnect line to EGR and plug first)..stumble idicates it is opening and operating one way correctly....computer controls the operation (when and duration)..so left to check is seating (spray carb cleaner around the EGR)......and computer instructing EGR at erroneous times to open (many possible reasons)..good luck and inform me/us of outcome :)
Posted on Dec 02, 2008
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Posted on Jan 02, 2017
Tips for a great answer:
With the ignition on and engine off, use a scan tool to activate the EGR solenoid. Listen or feel for a clicking, indicating that the solenoid is operating.
If the solenoid does operate, you'll have to check current draw on the ground circuit. It should be less than one amp. If it is then the problem is intermittent. If it isn't then there is excessive resistance in the circuit and perform the following
1. When it's activated see if you can blow lightly through it. IF you can\'t there may be a blockage causing excessive resistance. Replace EGR solenoid as needed. If there is no blockage, disconnect the EGR solenoid and the PCM connector containing the EGR solenoid control circuit. Using a digital Volt-Ohm meter (DVOM) check resistence between the control circuit and battery ground. It should be infinite. If it isn't, then there is a short to ground on the control circuit. Repair the short to ground and retest as needed.
2. If the solenoid doesn't click as it should, disconnect the EGR solenoid connector and connect a test light between the two wires. Using the scan tool, command the EGR solenoid on. The light should light up. If it does, replace the EGR solenoid. If it does not perform the following: a. Check for 12 Volts on the ignition supply voltage to the solenoid. If it isn't present, inspect the supply circuit for an open, or a short due to chafing or breakage and re-test. b. If it still doesn't operate: then manually ground the EGR solenoid control circuit. The light should light. If it does, repair open in EGR solenoid control circuit and re-test. If it doesn't, replace EGR solenoid.
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