Zero point calibration undone
I have this customer that complained of a lack of power on uphill acceleration. Scanning it it has this ABS code C1336 in it. I understand that I need to do a zero point calibration of the deceleration sensor on it. I haven't come across this before and was wondering what might be the cause of this. The customer does live in the hills and drives it off road a lot. I could not clear the code and when I test drove it there was no loss of power. Thank you for any information you can give!
On many of those 4runners that code will populate when certain components are replaced or when a check engine/abs light is cleared/repaired. You either need a scantool to perform the calibration or follow this procedure to do it by jumping the dlc terminals. Very easy either way. toyotanation.com/threads/zero-p…
Thank you Steven. To my knowledge nothing has been replaced or damaged. I plan on doing a calibration tomorrow with my Verus.
Its a common software glitch that is known by Toyota that happens when you enter the ECM and I think but not sure the ABS module too. Even when you plug in with Techstream and go into ECM module it generates this code and if it’s a good scan tool should have given you the caution like it does in Techstream. Just perform the Zero Point and carry on.
Doug, It seems unlikely that the lack of power is related, but if it is, and doing the zero point calibration corrects the problem, please let us know. Myself, I think it is a red herring. Look at your VE and the engine's breathing ability (but I'm pretty sure you know that already.) This is a case where graphing the scan data during the hard accelerations can really help you nail down the issue.
Zero point calibration wont cause lack of power. As for them calibration being undone,Ive seen it occur at random on many of those old 4runners for years. Im with Erik and suspect its a simple module glitch.
Thank you very much, I was thinking it would be a little weird that that would cause such a lack of power. On a side note while looking up the connections to test the throttle motor/TPS I was wondering what the VCC bl/rd wire was doing going to the vapor pressure sensor and What that had to do with throttle control? .. This vehicle finally came up with a transmission code P2714 SLT shift…