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LinkBack | Thread Tools | Display Modes |
06-11-2012, 04:20 PM
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EBP sometimes lower than MAP
I have been struggling with my EBP sensor for the last 9 months. Its a 2004.5 and since I have own the truck a p0471 code is trip about every couple of days. The EBP has been replaced twice, new tube and the exhaust nipple cleaned. I don't use the truck very hard and everything is stock. Using the SGII to monitor the MAP AND EBP sensors, I have witness the EBP on start up below 10 psi but would return to normal within seconds. Sometimes Its normal on start up but then gos below MAP psi and motor chokes as you start to accelerate.
I believe something to do with the EBP is not right but not sure what. I have tried to post a vid to help explain some of this. Hoping somebody can help Brendan 7b52b640.mp4 video by TTBrendan - Photobucket 
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06-11-2012, 04:44 PM
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EBP, ICP and EGR all share two of the same circuits. There is only one wire that is exclusive to the EBP circuit. Load test that circuit between the PCM and sensor.
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06-11-2012, 04:51 PM
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Would you know which wire and what readings I am looking for.
Brendan
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06-11-2012, 05:01 PM
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That would be the violet with light blue stripe coloured wire. If you have no other issues with any of the other sensors or actuators, that would be the wire to check between the EBP connector and pin #27 of the middle PCM connector. Try powering up a light bulb through that wire.
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06-11-2012, 05:17 PM
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No other issues. Are you thinking its a possible wire or bad PCM.
Thanks very much for the help. Brendan Sent from my Autoguide iPhone app
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06-11-2012, 05:42 PM
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I have NEVER had to replace a PCM in all the years of working on these trucks, but that doesn't rule it out as a possibility. The more likely scenario would be an issue with that circuit. Have you any chance replaced a thermostat on this truck recently or at any point in time, possibly spilling coolant on that wire to potentially cause your issue?
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06-12-2012, 02:00 AM
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I have not but, I only have owned the truck for about 9 months. Looking at the connector last night I think it has been change before.
Brendan Sent from my Autoguide iPhone app
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