ECU code 11 then 21 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

wow-thats-a-cool-car · 01-06-2010, 08:24 PM

Just swapped a motor into my car and it fired up fine first try drove it for a day then it will not start. I checked everything in the engine bay then I checked the ECU for codes...I got 11 and 21. This means the crank angle sensor is faulty. Should I just change it or is there something I over looked or could do instead.

The car is a 1989 nissan 240sx hatchback with a dual cam KA in it

any help is appreciated! thanks

wow-thats-a-cool-car · 01-08-2010, 06:57 PM

so can someone please help me!!!

yukon · 01-08-2010, 08:44 PM

Are you sure you did not burn something out because you used the wrong ecu, power transistor , etc? i doubt it is your cas.

Rabboni · 01-08-2010, 09:12 PM

Since there is no way of testing the cas without an oscilloscope you should just check the wiring from the sensor to the ecu. That way, if the wiring checks out good, you know that it is the sensor and you should just replace it. I doubt the pcm burned because that doesnt really happen often, but id still pray for the best.

wow-thats-a-cool-car · 01-08-2010, 11:08 PM

I just replaced the ignitor and the cas and still nothing? I'm pretty pissed I got the car running and let it sit for a week and this happened!!!!!

yukon · 01-08-2010, 11:35 PM

Check fuses and make sure everything is plugged in first. then the dist cap and rotor for anomolies . then the ecu and harness for burn marks.

jiggle connections especially the ecu plug to see if things change.

essforteen · 01-09-2010, 02:00 AM

check the power harness the two connectors on the side of the pass. fender
the brown and gray one
make sure there is a good connection

wow-thats-a-cool-car · 01-09-2010, 03:22 AM

the is power the ecu works fine and the fuel pump is priming

urg!!! how do I check the connections?

essforteen · 01-09-2010, 07:08 PM

Are you getting spark.
is the starter cranking
do you hear it trying to start???

help me help you!!

wow-thats-a-cool-car · 01-09-2010, 08:09 PM

Im getting everything but spark!!!!

essforteen · 01-10-2010, 02:51 AM

have you checked your coil

Rabboni · 01-10-2010, 06:20 PM

If youre getting everything except spark then start at the plugs and work your way back to find where voltage was lost. Also, did you check the wiring for shorts and/or opens or did you just throw parts at it. If so, results?

01-06-2010, 08:24 PM	#1
wow-thats-a-cool-car Post Whore! Join Date: Mar 2008 Location: California Posts: 2,663 Trader Rating: (6) Feedback Score: 6 reviews	ECU code 11 then 21 Just swapped a motor into my car and it fired up fine first try drove it for a day then it will not start. I checked everything in the engine bay then I checked the ECU for codes...I got 11 and 21. This means the crank angle sensor is faulty. Should I just change it or is there something I over looked or could do instead. The car is a 1989 nissan 240sx hatchback with a dual cam KA in it any help is appreciated! thanks __________________

01-08-2010, 06:57 PM	#2
wow-thats-a-cool-car Post Whore! Join Date: Mar 2008 Location: California Posts: 2,663 Trader Rating: (6) Feedback Score: 6 reviews	so can someone please help me!!! __________________

01-08-2010, 09:12 PM	#4
Rabboni Zilvia Member Join Date: Aug 2009 Location: Fairfield, CA Posts: 230 Trader Rating: (0) Feedback Score: 0 reviews	Since there is no way of testing the cas without an oscilloscope you should just check the wiring from the sensor to the ecu. That way, if the wiring checks out good, you know that it is the sensor and you should just replace it. I doubt the pcm burned because that doesnt really happen often, but id still pray for the best. __________________ Baling Wire-The Duct Tape Of Champions

01-08-2010, 11:08 PM	#5
wow-thats-a-cool-car Post Whore! Join Date: Mar 2008 Location: California Posts: 2,663 Trader Rating: (6) Feedback Score: 6 reviews	I just replaced the ignitor and the cas and still nothing? I'm pretty pissed I got the car running and let it sit for a week and this happened!!!!! __________________

01-08-2010, 11:35 PM	#6
yukon Zilvia Member Join Date: May 2009 Location: boston Age: 35 Posts: 157 Trader Rating: (0) Feedback Score: 0 reviews	Check fuses and make sure everything is plugged in first. then the dist cap and rotor for anomolies . then the ecu and harness for burn marks. jiggle connections especially the ecu plug to see if things change. Last edited by yukon; 01-09-2010 at 02:08 AM..

01-08-2010, 08:44 PM	#3
yukon Zilvia Member Join Date: May 2009 Location: boston Age: 35 Posts: 157 Trader Rating: (0) Feedback Score: 0 reviews	Are you sure you did not burn something out because you used the wrong ecu, power transistor , etc? i doubt it is your cas.

01-09-2010, 02:00 AM	#7
essforteen Nissanaholic! Join Date: Apr 2007 Location: LAX Area (So CAL) Posts: 1,802 Trader Rating: (50) Rides Gallery: essforteen Feedback Score: 50 reviews	check the power harness the two connectors on the side of the pass. fender the brown and gray one make sure there is a good connection

01-09-2010, 03:22 AM	#8
wow-thats-a-cool-car Post Whore! Join Date: Mar 2008 Location: California Posts: 2,663 Trader Rating: (6) Feedback Score: 6 reviews	the is power the ecu works fine and the fuel pump is priming urg!!! how do I check the connections? __________________

01-09-2010, 07:08 PM	#9
essforteen Nissanaholic! Join Date: Apr 2007 Location: LAX Area (So CAL) Posts: 1,802 Trader Rating: (50) Rides Gallery: essforteen Feedback Score: 50 reviews	Are you getting spark. is the starter cranking do you hear it trying to start??? help me help you!!

01-09-2010, 08:09 PM	#10
wow-thats-a-cool-car Post Whore! Join Date: Mar 2008 Location: California Posts: 2,663 Trader Rating: (6) Feedback Score: 6 reviews	Im getting everything but spark!!!! __________________

01-10-2010, 02:51 AM	#11
essforteen Nissanaholic! Join Date: Apr 2007 Location: LAX Area (So CAL) Posts: 1,802 Trader Rating: (50) Rides Gallery: essforteen Feedback Score: 50 reviews	have you checked your coil

01-10-2010, 06:20 PM	#12
Rabboni Zilvia Member Join Date: Aug 2009 Location: Fairfield, CA Posts: 230 Trader Rating: (0) Feedback Score: 0 reviews	If youre getting everything except spark then start at the plugs and work your way back to find where voltage was lost. Also, did you check the wiring for shorts and/or opens or did you just throw parts at it. If so, results? __________________ Baling Wire-The Duct Tape Of Champions