Tim D Posted February 18, 2018 Report Share Posted February 18, 2018 Hi, please could I have some help, I have a Closed Loop CAN Lambda on my Subaru Impreza, but have run into a problem. I now see "CAN Lambda Error 54 Excess pump current" and the Lambda goes to 10.119 shortly after starting. Not sure if this is an error I have somehow introduced as I have been looking into CAN streams and adding a custom dash. So far, I have only configured a CAN stream on CAN Module 2, at ID 1300, believing that this would have no interaction with CAN Lambda Module 1 at ID 950. I have not got as far as connecting anything to the ECU as yet. I have since loaded a previous know good tune but the problem persists. The CAN status is all good (green) in PC Link, see pictures below... Help? Quote Link to comment Share on other sites More sharing options...
ClintBHP Posted February 18, 2018 Report Share Posted February 18, 2018 This can happen if the mixture is very rich or the sensor is failing, remove the lambda from the exhaust check the sensor for fouling and see if its the same in free air. Try and new sensor. TechDave 1 Quote Link to comment Share on other sites More sharing options...
Tim D Posted February 18, 2018 Author Report Share Posted February 18, 2018 Thanks very much for the speedy response, I will try that. The sensor is only a couple of years old, but I do a lot of short trips, so I guess it's running rich a lot of the time! Quote Link to comment Share on other sites More sharing options...
Tim D Posted February 20, 2018 Author Report Share Posted February 20, 2018 Clint, Thanks for your advice, the new Lambda sensor did the trick, Lambda is spot on again! Great service from BHP too. TechDave and ClintBHP 2 Quote Link to comment Share on other sites More sharing options...
ClintBHP Posted February 20, 2018 Report Share Posted February 20, 2018 Glad to help Tim Quote Link to comment Share on other sites More sharing options...
Samurai Supra Posted May 12, 2022 Report Share Posted May 12, 2022 Hi All. I have experienced this error, the sensor would have covered around 5000kms. Is there anything that can be done to prevent it? Is it the sensor at fault or the unit? I have a relay & power is drawn from the battery, I don't have the capacitor. Appreciate the assistance. Thanks Quote Link to comment Share on other sites More sharing options...
Baggy-4G63 Posted May 12, 2022 Report Share Posted May 12, 2022 I recently replaced a sensor due to the same error code and and my AFR going lean and running away. Probably had a few more KMS on it than yours. Fitted a new “motor sport” LSU 4.9 and problem gone. Quote Link to comment Share on other sites More sharing options...
Samurai Supra Posted May 12, 2022 Report Share Posted May 12, 2022 Thanks mate. I found this article, based on it, I think I have 2 issues, sensor is more than 1m away from the engine & turbo seals are worn. These will be remedied soon, going single turbo.. Hope I don't kill another sensor till then. https://www.nzefi.com/bosch-lsu-wide-band-airfuel-ratio-lambda-sensors-fail-often-aftermarket-performance-applications/ Quote Link to comment Share on other sites More sharing options...
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