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The Terminator
Engine/Tuning
03 Cobra P0405 - Sensor A Circuit Low
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<blockquote data-quote="Boogie Chillin" data-source="post: 15936846" data-attributes="member: 25529"><p><span style="font-size: 15px">Well that's a bit different from unofficial instructions I found for testing the DPFE. I'll check the wire harness, I can order another one of those if it changes by moving it around. I wonder if the code resets if the voltage goes up to the .2 V range. Thanks for looking that up. Here is what I found on the net - looks like that is wrong. </span></p><p><span style="font-size: 15px"></span></p><p><span style="font-size: 15px"></span></p><p><span style="font-size: 15px"><strong>How to troubleshoot Ford EGR</strong></span></p><p>Step 1) Check the condition of the vacuum hoses going to the DPFE sensor and the EVR. Look for cracks or tears. Replace the hose if you find any.</p><p>Step 2) Check the operation of the DPFE with the engine off, key in the run position. Using a digital voltmeter, check for voltage on the brown/light green wire. <u><em><strong>Look for a reading between .45 and 1.1 volts.</strong></em></u> If your reading is outside that range, you have one more voltage check to perform before replacing the sensor. Check the voltage on the brown/white wire. It should read 5 volts. If it doesn’t, the sensor isn’t getting power from the computer. Then it’s a whole new ballgame. If you have 5 volts, and the reading from the brown/light green wire is outside the range, replace the DPFE. After replacement, perform the voltage check again to eliminate the possibility that the EGR valve is not seating properly.</p><p>Step 3) Leave your meter connected and start the engine. The voltage SHOULD NOT CHANGE! That’s because there should be no EGR flow at idle. If the DPFE voltage changes, either the EGR pintle isn’t seating properly and it’s allowing exhaust flow past the seat, or the DPFE is bad.</p><p>Step 4) Remove the EGR valve and check the condition of the pintle, pintle seat, and the EGR passages. They will be coated with black soot. But the passages should not be clogged and the pintle should move off its seat with the application of vacuum. Clean</p><p>the pintle, pintle seat, and passages with carb or throttle body cleaner.</p></blockquote><p></p>
[QUOTE="Boogie Chillin, post: 15936846, member: 25529"] [size=4]Well that's a bit different from unofficial instructions I found for testing the DPFE. I'll check the wire harness, I can order another one of those if it changes by moving it around. I wonder if the code resets if the voltage goes up to the .2 V range. Thanks for looking that up. Here is what I found on the net - looks like that is wrong. [b][/b] [b][/b] [b][/b] [b]How to troubleshoot Ford EGR[/b][/size] Step 1) Check the condition of the vacuum hoses going to the DPFE sensor and the EVR. Look for cracks or tears. Replace the hose if you find any. Step 2) Check the operation of the DPFE with the engine off, key in the run position. Using a digital voltmeter, check for voltage on the brown/light green wire. [U][i][b]Look for a reading between .45 and 1.1 volts.[/b][/i][/U] If your reading is outside that range, you have one more voltage check to perform before replacing the sensor. Check the voltage on the brown/white wire. It should read 5 volts. If it doesn’t, the sensor isn’t getting power from the computer. Then it’s a whole new ballgame. If you have 5 volts, and the reading from the brown/light green wire is outside the range, replace the DPFE. After replacement, perform the voltage check again to eliminate the possibility that the EGR valve is not seating properly. Step 3) Leave your meter connected and start the engine. The voltage SHOULD NOT CHANGE! That’s because there should be no EGR flow at idle. If the DPFE voltage changes, either the EGR pintle isn’t seating properly and it’s allowing exhaust flow past the seat, or the DPFE is bad. Step 4) Remove the EGR valve and check the condition of the pintle, pintle seat, and the EGR passages. They will be coated with black soot. But the passages should not be clogged and the pintle should move off its seat with the application of vacuum. Clean the pintle, pintle seat, and passages with carb or throttle body cleaner. [/QUOTE]
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