jnfurniss Posted July 4, 2023 Report Share Posted July 4, 2023 I bought a GX4 second and I think it might have a bad internal MAP. I have been able to diagnose and fix any error I have come across so far. But for some reason, when I calibrate the MAP sensor. It fails every time. I get this message every time, MAP Sensor Calibration command failed: Current MAP <5kPa or > 5kPa of baro reading. I have adjusted the k5Pa to several times to many different settings I have found, here within the forums. I so not have a map or any tune yet as I can't get the MAP sensor to calibrate. Any help would be appreciated. Quote Link to comment Share on other sites More sharing options...
Vaughan Posted July 4, 2023 Report Share Posted July 4, 2023 G4X ECUs changed from a 4Bar internal MAP sensor to a 7Bar sensor a while ago so you might just have it set to the wrong calibration, what voltage does the sensor show at atmospheric pressure and what calibration have you got it set to? Quote Link to comment Share on other sites More sharing options...
jdniss Posted July 5, 2023 Report Share Posted July 5, 2023 Two similar issues below @Vaughan. My testing was on a new NS15X - v3.1 main board - Firmware 6.23.6 Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 5, 2023 Report Share Posted July 5, 2023 @jdniss If you have an issue you will need to provide a log and a copy of your tune, can't tell anything from a pic. Unlikely related to this post. Quote Link to comment Share on other sites More sharing options...
jnfurniss Posted July 5, 2023 Author Report Share Posted July 5, 2023 6 hours ago, Vaughan said: G4X ECUs changed from a 4Bar internal MAP sensor to a 7Bar sensor a while ago so you might just have it set to the wrong calibration, what voltage does the sensor show at atmospheric pressure and what calibration have you got it set to? I tried a few different options. Low is .05kpa high was was 4.95 kPa. I haven't touched it since I posted this. But I will try changing it to the 7bar tomorrow night and update you. Thank you for replying. Quote Link to comment Share on other sites More sharing options...
jnfurniss Posted July 5, 2023 Author Report Share Posted July 5, 2023 Got it. That was the problem. Thank you for your assistance Vaughan 1 Quote Link to comment Share on other sites More sharing options...
jnfurniss Posted July 6, 2023 Author Report Share Posted July 6, 2023 On 7/4/2023 at 4:25 PM, Vaughan said: G4X ECUs changed from a 4Bar internal MAP sensor to a 7Bar sensor a while ago so you might just have it set to the wrong calibration, what voltage does the sensor show at atmospheric pressure and what calibration have you got it set to? Another question instead of making another thread. I noticed my Lambda doesn't move. I have a series x Uego but without having an expansion loom, is there a way to wire in my wideband? Quote Link to comment Share on other sites More sharing options...
Vaughan Posted July 6, 2023 Report Share Posted July 6, 2023 The series X can be wired in via either CAN or via a spare analog input, I always recommend CAN as it is immune to ground offset issues. I'm not sure which specific ECU you have (assuming a plugin) but you may be able to use a spare Analog from the main header if you wanted to avoid buying an expansion connector/loom or CAN loom, the old Narrowband O2 sensor plug is often a good way to do this if your vehicle has one and the ECU is pinned to support it. Quote Link to comment Share on other sites More sharing options...
jnfurniss Posted July 6, 2023 Author Report Share Posted July 6, 2023 9 minutes ago, Vaughan said: The series X can be wired in via either CAN or via a spare analog input, I always recommend CAN as it is immune to ground offset issues. I'm not sure which specific ECU you have (assuming a plugin) but you may be able to use a spare Analog from the main header if you wanted to avoid buying an expansion connector/loom or CAN loom, the old Narrowband O2 sensor plug is often a good way to do this if your vehicle has one and the ECU is pinned to support it. I am using a G4x Xtreme. Plug n play unit for the 350z. Quote Link to comment Share on other sites More sharing options...
Vaughan Posted July 6, 2023 Report Share Posted July 6, 2023 An Volt 10 or 11 are available on the factory NB O2 sensor plugs or An Volt 3 in the MAF plug if you're not using that or An Volt if you're not using AC or An Volt 1 if not using cruise control. Quote Link to comment Share on other sites More sharing options...
jnfurniss Posted July 6, 2023 Author Report Share Posted July 6, 2023 12 minutes ago, Vaughan said: An Volt 10 or 11 are available on the factory NB O2 sensor plugs or An Volt 3 in the MAF plug if you're not using that or An Volt if you're not using AC or An Volt 1 if not using cruise control. Perfect thank you. Quote Link to comment Share on other sites More sharing options...
jnfurniss Posted July 9, 2023 Author Report Share Posted July 9, 2023 On 7/5/2023 at 9:57 PM, jnfurniss said: Perfect thank you. So I'm rather confused at this point. My Lambda within the software is pinned at 1.302. On my wideband it's at about 14.5 which should be roughly 1 lambda. My car will idle for 5-10 seconds and then dies because the goes to about -55 MGP (kPa) of 45.9-46.3 at about 600rpm. I can hold the rpms steady around 800 and make adjustments on the mixture table, but I feel like I am missing something. Quote Link to comment Share on other sites More sharing options...
DerekAE86 Posted July 9, 2023 Report Share Posted July 9, 2023 2 hours ago, jnfurniss said: So I'm rather confused at this point. My Lambda within the software is pinned at 1.302. Sounds like a wiring issie. 1.302 Lambda would mean the ECU is seeing a constant 5v on the Analog Input. According to the X-Series manual you need to connect the White wire to your spare An Volt input on your ECU and the Brown wire to Sensor GND on the ECU. Then create and assign a Linear Cal of 0.50v = 0.58 Lambda / 4.5v = 1.23 Lambda. Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 9, 2023 Report Share Posted July 9, 2023 18 hours ago, jnfurniss said: My car will idle for 5-10 seconds and then dies because the goes to about -55 MGP (kPa) of 45.9-46.3 at about 600rpm. I can hold the rpms steady around 800 and make adjustments on the mixture table, but I feel like I am missing something. Sounds like not enough fuel. Have you adjusted the master fuel? Attach a log and your tune. Quote Link to comment Share on other sites More sharing options...
jdniss Posted July 10, 2023 Report Share Posted July 10, 2023 On 7/5/2023 at 1:16 PM, Adamw said: @jdniss If you have an issue you will need to provide a log and a copy of your tune, can't tell anything from a pic. Unlikely related to this post. The same exact error message two others are receiving - including the Post I linked, that was opened by a separate user..? The G4X in question has been installed in place of a functional G4+ that was running for 3 years no issues - no MAP errors to speak of. The G4X was loaded with the supplied base map and sensor reconfiguration to suit. I'll see if can re-replicate the problem again tomorrow morning and grab another log. Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 10, 2023 Report Share Posted July 10, 2023 What I mean by yours being unrelated is the two users in this post and the OP in the other one you linked all had the 4bar calibration selected in their tune when their ecu actually has a 7bar sensor. Your post said your ecu had a 7 bar sensor and your screenshot suggested you had already selected the 7bar cal, so that cant be the problem in your case. To diagnose your issue it would be best to start a dedicated post with the tune and log attached so it gets the attention it deserves. Quote Link to comment Share on other sites More sharing options...
jdniss Posted July 11, 2023 Report Share Posted July 11, 2023 Hi @Adamw, See log and map attached. I kept flipping between metric and imperial pressures in the PCLink Preferences prior to engine start - as that's what solved the issue last time and allowed the software to register a successful MAP sensor calibration - no luck this time though. Thanks Nissan S14-15 7Bar G4X Xtreme Plugin ADM 740.pclx 7bar map base test.llgx Quote Link to comment Share on other sites More sharing options...
koracing Posted July 11, 2023 Report Share Posted July 11, 2023 The MAP has to be within 5kpa of the BAP for the calibration to be successful. This number seems a little bit arbitrary but I understand why they set a range. If your voltage is good and your grounds are all good (which can affect sensor readings), check what the MAP reading is without the hose from the manifold connected. If it doesn't seem to want to fall inside the 5kpa range, you can "trick" the calibration as you are right on the cusp of your map being 105.8kpa when BAP is 100.8kpa. You can apply the tiniest bit of vacuum to the hose (suck on it a little) to get it to read within that 5kpa range but still above the BAP reading and then click calibrate. At that point if you stop sucking on the hose the calibration should be within 5kpa when you hook the hose back up and you can calibrate again and it should work fine. jdniss 1 Quote Link to comment Share on other sites More sharing options...
Brian B Posted July 15, 2023 Report Share Posted July 15, 2023 I tried this, I had to blow into the vacuum line to trick the map to calibrate, once it had I then tried to re-calibrate and it failed again. Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 15, 2023 Report Share Posted July 15, 2023 @jdniss I think you should get your ECU back to Link for inspection, I suspect your MAP sensor is probably faulty, in your log the voltage on AN Volt 3 is a good 50mV or 10Kpa higher than it should be. Contact [email protected] to arrange. @Brian B You shouldn't need to do any tricks like that with G4X as the offset is cleared everytime you do a cal. This was different in G4+ which could end up with a zero offset stored from a previous calibration that would cause subsequent cal to fail. So if a G4X doesnt pass MAP cal you either have a faulty sensor or an incorrect calibration set. Quote Link to comment Share on other sites More sharing options...
Brian B Posted July 15, 2023 Report Share Posted July 15, 2023 I’m using the Link 3 bar calibration set, I tried it also on the generic and Bosch settings. Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 16, 2023 Report Share Posted July 16, 2023 So what MAP sensor do you actually have? Quote Link to comment Share on other sites More sharing options...
Brian B Posted July 16, 2023 Report Share Posted July 16, 2023 Link 3 bar Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 16, 2023 Report Share Posted July 16, 2023 Can you attach a copy of your tune so I can see the voltage, pressure and BAP being reported. How old is it? Is it one of the current models in the black billet case like below? Quote Link to comment Share on other sites More sharing options...
Brian B Posted July 16, 2023 Report Share Posted July 16, 2023 Looks just like the one pictured. 02-Celica-1uz-V1.5-adjustment 2.pclx PC Datalog brian B - 2023-07-15 10;28;34 am.llgx Quote Link to comment Share on other sites More sharing options...
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