error code 42 issues

bignag06 · 08-23-2011, 09:32 PM

i ran the diagnostic on my 1988 supra and got the error code 42. my question is will that cause the car to lose power and cause it to almost turn off when letting go off the brake to start driving? if not what else could it be? appreciate the help and thanks in advanced!!

cre · 08-29-2011, 07:56 PM

You'll get more response if you post in the MKIII Supra sub-forum. I'll move this thread there for you.

bignag06 · 08-30-2011, 05:29 AM

thanks!!! i also have a code 11 which is a momentary interruption of power supply in ecu. how do i check if its the wires or the ecu itself?

Sonyps307 · 08-30-2011, 01:50 PM

For code 42 does ur speedo work if not then the speedo cable coming form the transmission is broken. so the speedo sensor is not getting a signal. If it does work then the speed sensor is bad. I don't know if that is causing that problem or not. Now for the code 11 check the main grounds for the ecu. they r 2 brown and 2 white wires that r bolted to the intake right above the starter. Just try cleaning them first and erase the code to see if it comes back again later.

Check out this site

http://www.mkiiisupra.net/joomla/ind...d=24&Itemid=29

MA70-3.0GT · 08-30-2011, 01:51 PM

Welcome, firstly the TSRM http://www.cygnusx1.net/Supra/Librar...ection=FI&P=23 which is your best friend when it comes to the Mk3 doesnt seem to list a code 11. The code 42 I believe wouldnt cause the engine to stall or nearly stall although I'd appreciate if someone could back me up/correct me on that.

Assuming there is an interruption of ECU power supply, that would cause the car to cut out. Perhaps you could check your fusible link & other EFI related fuses first off (bearing in mind that old fuses can & do fracture without actually melting, causing intermittent contact) and then try clearing the codes to see what comes up then.

Hopefully the link will provide more than enough to be going on with for now, before I go can I just point out that with certain issues it helps to know if we're talking turbo or n/a.

bignag06 · 08-31-2011, 05:29 AM

sony: my speedo does work but it bounces around but still staying with the actual speed. i'll check that out thanks for the info.

ma70: thanks for the welcome. according to a website that deals with obd1 codes. code 11 only comes up on cars up to 1991. thanks for the tips, i will try those things out and see what happens. btw, my supra is n/a.

cre · 08-31-2011, 06:48 PM

An erratic speed signal is as bad as not speed signal.

You're not going to find code 11 in any MKIII after '88. It is the code for "momentary interruption in power +B (and/or +B1)" and can also be caused as mentioned by poor grounding at the head.

http://supra.co.nz/87tsrm/EFI/efi30.htm

08-23-2011, 09:32 PM	#1
bignag06 Stock Join Date: Aug 2011 Location: compton, ca Posts: 11	error code 42 issues i ran the diagnostic on my 1988 supra and got the error code 42. my question is will that cause the car to lose power and cause it to almost turn off when letting go off the brake to start driving? if not what else could it be? appreciate the help and thanks in advanced!!

08-29-2011, 07:56 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	You'll get more response if you post in the MKIII Supra sub-forum. I'll move this thread there for you. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

08-30-2011, 01:51 PM	#5
MA70-3.0GT 12psi boost Join Date: Oct 2009 Location: Crewe, England Posts: 356	Welcome, firstly the TSRM http://www.cygnusx1.net/Supra/Librar...ection=FI&P=23 which is your best friend when it comes to the Mk3 doesnt seem to list a code 11. The code 42 I believe wouldnt cause the engine to stall or nearly stall although I'd appreciate if someone could back me up/correct me on that. Assuming there is an interruption of ECU power supply, that would cause the car to cut out. Perhaps you could check your fusible link & other EFI related fuses first off (bearing in mind that old fuses can & do fracture without actually melting, causing intermittent contact) and then try clearing the codes to see what comes up then. Hopefully the link will provide more than enough to be going on with for now, before I go can I just point out that with certain issues it helps to know if we're talking turbo or n/a. __________________ '89 MA70 Supra GT aero 3.0turbo JDM, Rebuilt motor, K&N intake, 3" stainless turbo-back. New turbo and braided line kit... '89 Honda NC27 400, NC23 cams, open pipe, PC36a shock & possibly Showa USD forks... '83 Yamaha 29R XJ750E-II, number 69 off the line, only runner in the country? Original except Koni shocks '95 Honda PC26 CB500R, Winter hack, hateful, trying to sell it I'm not paranoid, they really ARE after me!!!

08-31-2011, 06:48 PM	#7
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	An erratic speed signal is as bad as not speed signal. You're not going to find code 11 in any MKIII after '88. It is the code for "momentary interruption in power +B (and/or +B1)" and can also be caused as mentioned by poor grounding at the head. http://supra.co.nz/87tsrm/EFI/efi30.htm __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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08-30-2011, 05:29 AM	#3
bignag06 Stock Join Date: Aug 2011 Location: compton, ca Posts: 11	thanks!!! i also have a code 11 which is a momentary interruption of power supply in ecu. how do i check if its the wires or the ecu itself?

08-30-2011, 01:50 PM	#4
Sonyps307 Lexus & 550's Join Date: May 2010 Location: Baltimore Posts: 526	For code 42 does ur speedo work if not then the speedo cable coming form the transmission is broken. so the speedo sensor is not getting a signal. If it does work then the speed sensor is bad. I don't know if that is causing that problem or not. Now for the code 11 check the main grounds for the ecu. they r 2 brown and 2 white wires that r bolted to the intake right above the starter. Just try cleaning them first and erase the code to see if it comes back again later. Check out this site http://www.mkiiisupra.net/joomla/ind...d=24&Itemid=29

08-31-2011, 05:29 AM	#6
bignag06 Stock Join Date: Aug 2011 Location: compton, ca Posts: 11	sony: my speedo does work but it bounces around but still staying with the actual speed. i'll check that out thanks for the info. ma70: thanks for the welcome. according to a website that deals with obd1 codes. code 11 only comes up on cars up to 1991. thanks for the tips, i will try those things out and see what happens. btw, my supra is n/a.