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Code 0302 EGR System Hi/Low Flow

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Old May 22, 2004 | 02:19 PM
  #1  
tm96max's Avatar
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Code 0302 EGR System Hi/Low Flow

Does anybody know what this would mean or what part or parts I would have to replace?

Troy
Old May 22, 2004 | 02:34 PM
  #2  
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From: Lake Orion, MI
0302
Diagnostic Trouble code 0302 points to a problem with the Exhaust Gas Recirculation system. The malfunction is detected by the Engine Control Module when no EGR flow is detected under conditions which call for EGR. Possible causes include:
- The electrical harness or connectors (valve circuit open or shorted)
- The EGR valve is stuck closed
- Weak or dead battery
- The EGR passage is clogged
- Faulty EGR temperature sensor circuit
- A leak somewhere in the exhaust system

The EGR Volume Control Valve may be tested with an ohmmeter. Disconnect the electrical connector. Looking at the connector half which is attached to the EGRVCV with the latch at the 12 o'clock position you will see two rows of three terminals. The top row is numbered 1-3, right to left. The bottom row is numbered 4-6, right to left. Measure the resistance between these terminal pairs:
2 1
2 3
5 4
5 6
... all resistance values should be 20.9-23.1 ohms at 68 degrees F.

Reconnect the EGRVCV connector halves. Turn the ignition switch ON OFF repeatedly. Verify that the EGRVCV shaft moves smoothly forward backward according to the ignition switch position.

The Exhaust Gas Temperature Sensor may be tested with an ohmmeter. The specifications are ...
- at 32 degrees F, 0.68-1.11 Megohms
- at 122 degrees F, 0.09-0.12 Megohms
- at 212 degrees F, 0.017-0.024 Megohms
Old May 22, 2004 | 02:45 PM
  #3  
tm96max's Avatar
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Wow kevlo911 - thank-you much! I'll check out the EGR system for blocks in the hoses and check the wiring as well. If that is not it, I'll go to my brother in-laws and have him check the resistance of the parts. Thanks again!

Troy
Old May 22, 2004 | 02:46 PM
  #4  
tynant's Avatar
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Joined: Oct 2000
Posts: 475
you can just have the egr system cleaned out...if that doesnt work replace the egr valve....costs 50 dollars for me to have the whole system flushed....
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