P2A00 & P0300 Misfire

1slow370 · 11-21-2013, 08:32 PM

Yeah... U1024 is not a good code it means when they reflashed your ecm it lost it's ability to communicate with the vvel control module, IT is a CAN line communication error code, take it back ASAP. Show him the code on your reader and watch him read your codes and refuse to pay for the diagnostic since it happened after they worked on it. You can tell him it should be around page EC-156 in the FSM.

megalapagas · 11-21-2013, 09:10 PM

Dammit and here I thought it was fixed ok ill be sure to go back and see what happens, worst case scenario am I looking at purchasing a New ECM?

Kmccarthy714 · 12-07-2013, 04:09 PM

Ok I'm really lost, system was smoke tested, no leaks. Replaced the bank 1 sensor 1 a/f sensor again with denso part. Codes came back. My short term fuek trim in that bank is off the charts, indicating a lean conditoon. I can't find a lean condition anywhere. really am lost.

1slow370 · 12-08-2013, 02:35 AM

disconnect the sensor and the ecu harness and check the wires for a short, procedure is in the factory manual. If you don't have the manual download it, then follow the instructions on page EC-476 through EC-479 to the letter, don't leave any steps out. When you need to clear the short term fuel trims a battery reset will work. If you already smoke tested the intake you have one of the hard steps out of the way. If that doesn't fix your problem then come back. Too many dealer techs don't follow the damn manual. you don't happen to have the old sensor to check and see if it shorted and fried the o2 controller in the ecu do you? Too many dealer techs don't inspect a part they replace to see if it was actually broken or, if it may have fried something else.

Kmccarthy714 · 12-09-2013, 01:49 PM

Quote:

Originally Posted by 1slow370

disconnect the sensor and the ecu harness and check the wires for a short, procedure is in the factory manual. If you don't have the manual download it, then follow the instructions on page EC-476 through EC-479 to the letter, don't leave any steps out. When you need to clear the short term fuel trims a battery reset will work. If you already smoke tested the intake you have one of the hard steps out of the way. If that doesn't fix your problem then come back. Too many dealer techs don't follow the damn manual. you don't happen to have the old sensor to check and see if it shorted and fried the o2 controller in the ecu do you? Too many dealer techs don't inspect a part they replace to see if it was actually broken or, if it may have fried something else.

Thanks man no I actually never did check that sensor, my only concern is why am I throwing a random miss with high fuel trims. Could the CAI's be causing that in one bank only? I will download that manualand go from there I actuslly have time now that she's off the road for the winter.

1slow370 · 12-09-2013, 01:58 PM

Yeah just follow the manual. After you go through the o2 code and it still doesnt work then you get to go through the p0300.

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Mandingo · 12-09-2013, 05:07 PM

Which intake do you have?

1slow370 · 12-09-2013, 05:15 PM

His problem is most likely unrelated to his intake.

11-21-2013, 08:32 PM	#16 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	Yeah... U1024 is not a good code it means when they reflashed your ecm it lost it's ability to communicate with the vvel control module, IT is a CAN line communication error code, take it back ASAP. Show him the code on your reader and watch him read your codes and refuse to pay for the diagnostic since it happened after they worked on it. You can tell him it should be around page EC-156 in the FSM. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50 Last edited by 1slow370; 11-21-2013 at 08:35 PM.

11-21-2013, 09:10 PM	#17 (permalink)
megalapagas Enthusiast Member Join Date: May 2013 Location: McAllen,TX Posts: 457 Drives: '10 370Z Tour A/T Rep Power: 12	Dammit and here I thought it was fixed ok ill be sure to go back and see what happens, worst case scenario am I looking at purchasing a New ECM? __________________ GTM 34 Row Oil Cooler \| K&N Drop Ins w/ Z1's Post MAF Tubes \| F.I Non-Res'd 2.5" T.P w/ CF CBE \| Axis Wheels \| Piecing together My Own Custom T4 Top Mount Single Turbo Kit Still in the works \|

12-08-2013, 02:35 AM	#19 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	disconnect the sensor and the ecu harness and check the wires for a short, procedure is in the factory manual. If you don't have the manual download it, then follow the instructions on page EC-476 through EC-479 to the letter, don't leave any steps out. When you need to clear the short term fuel trims a battery reset will work. If you already smoke tested the intake you have one of the hard steps out of the way. If that doesn't fix your problem then come back. Too many dealer techs don't follow the damn manual. you don't happen to have the old sensor to check and see if it shorted and fried the o2 controller in the ecu do you? Too many dealer techs don't inspect a part they replace to see if it was actually broken or, if it may have fried something else. Jordo! likes this. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

12-09-2013, 01:58 PM	#21 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	Yeah just follow the manual. After you go through the o2 code and it still doesnt work then you get to go through the p0300. Sent from my HTCONE using Tapatalk __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

12-09-2013, 05:07 PM	#22 (permalink)
Mandingo Track Member Join Date: Nov 2010 Location: Dallas Posts: 625 Drives: '10 370z 6spd Rep Power: 3371	Which intake do you have? __________________ some mods

12-07-2013, 04:09 PM	#18 (permalink)
Kmccarthy714 Base Member Join Date: May 2013 Location: Orange County, NY Posts: 77 Drives: 09 Brilliant Silver Rep Power: 12	Ok I'm really lost, system was smoke tested, no leaks. Replaced the bank 1 sensor 1 a/f sensor again with denso part. Codes came back. My short term fuek trim in that bank is off the charts, indicating a lean conditoon. I can't find a lean condition anywhere. really am lost.

12-09-2013, 05:15 PM	#23 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	His problem is most likely unrelated to his intake. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

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