Limp mode?

Tiny
DIAKPO
  • MEMBER
  • 2002 TOYOTA RAV4
  • 210,000 MILES
A few months ago I changed my car's PCM/ECU and soon after that the car started decelerating even when I pressed the gas pedal. On cleaning the mass air flow meter, this problem stopped. It started again a few weeks ago. And once I press the gas pedal once, it surges forward. But it only occurs after it had been parked for a long time and it doesn't occur again after 10 minutes of driving. Always the same pattern. Then I did a scan and these are the results:
P0110
P0115
P0135
P0155
P1300
P1315

The mechanic suggests I change my MAF and cold start valve but I don't want to take any steps before I get a second opinion.
Saturday, December 7th, 2019 AT 2:28 PM

10 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
It is possible that you have an issue with the MAF sensor but I don't think that will solve all the issues. Plus take a look at the third attachment. I highlighted the important part. It states that if you have these additional codes then you have an open ground circuit. While you don't have all the codes it doesn't mean that this is still not the issue.

I don't see anything here that says it is not the MAF but I would need a little more convincing to think it will resolve all these codes.

I assume that he is going on the fact that cleaning the sensor fixed it last time so now it is just past cleaning and needs replaced. Again, not saying that is wrong but with this info, there could be a larger issue.
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Sunday, December 8th, 2019 AT 5:53 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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This doesn't sounds like a MAF sensor problem because these codes are all over the map. Can I ask why you changed the PCM out? It sounds like it is not correctly programmed for the car. Here is the instructions for how to do so in the diagrams below:

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2002 Toyota Truck RAV4 2WD L4-2.0L (1AZ-FE)
Vehicle Reprogramming
Vehicle Powertrain Management Relays and Modules - Powertrain Management Relays and Modules - Computers and Control Systems Engine Control Module Testing and Inspection Programming and Relearning Vehicle Reprogramming
VEHICLE REPROGRAMMING
VEHICLE REPROGRAMMING
Beginning with some 2001 models and expanding to all models by 2007, Toyota/Scion and Lexus vehicles are equipped with flash reprogrammable Powertrain Control Modules (PCM). Reprogramming should only be performed if a Technical Service Bulletin or Service Campaign provides direction to do so.

Flash reprogramming may be accomplished using one of the following methods:
- Toyota/Lexus factory scantool
- Vetronix Mastertech
- J2534 Compatible Vehicle Interface (Toyota validated and approved)

REPROGRAMMING WITH SCANTOOL
Toyota/Scion/Lexus ECMs can be reprogrammed using either the Toyota/Lexus factory scantool, or the Vetronix Mastertech scantool. The ECM reprogramming function is only available with the authentic Toyota factory scantool software which runs on either of the above mentioned scantools. Scantool software version requirements are specified in applicable Technical Service Bulletin (TSB)/Service Communication (SC) documents.

The Toyota/Lexus factory scantool and/or authentic factory software program cards can be purchased through the official Toyota and Lexus Special Service Tool provider, SPX Corp. To order, call (800) 933-8335 and request either:
- P/N 01001271 for the Toyota/Lexus factory scantool including factory software program card
- P/N 01002593-005 for the "stand alone" program card

Program cards are provided with the latest production version software available at time of purchase.

Vehicle recalibration using a scantool requires use of the following:
- Personal Computer running a Microsoft Windows 2000 or Windows XP operating system
- Toyota Diagnostic Tester or Vetronix Mastertech Scantool with Toyota factory software
- Toyota/Lexus factory scantool program card
- PC Interface Cable (P/N 01001090) to transfer data from PC to scantool
- Calibration CD (00456-REPRG-001)

REPROGRAMMING WITH J2534 INTERFACE
Toyota/Scion/Lexus ECMs that can be reprogrammed with a scantool can also be reprogrammed using a Toyota validated J2534-1 interface. Vehicle recalibration requires the use of the following:
- Toyota validated J2534 interface
- Toyota Calibration Update Wizard software (available on calibration CD)
- Personal Computer running Microsoft Windows 2000/XP or later operating system
- Calibration CD (00456-REPRG-001)

Toyota strongly recommends USING ONLY VALIDATED INTERFACE DEVICES that appear on this list.

Validated J2534 Devices
Toyota works closely with J2534 interface manufacturers to ensure that their hardware works safely and efficiently with their products. Every device listed on this page has been thoroughly tested and validated on Toyota, Scion and Lexus vehicles.

It is important to understand that only the specific devices, firmware, DLLs and APIs listed here have been tested by Toyota. Toyota does not recommend use of any other J2534 device, firmware, DLL or API that is not listed here. Changes to J2534 hardware/software is outside of Toyota's control; in some cases, changes made to device hardware/software can negatively impact reprogramming performance. Toyota makes every effort to continue to work with J2534 interface manufacturers to ensure continued product compatibility as the respective products evolve.

Requirement for device:

Supplier Device Name Version (Firmware* / DLL* / API*)
Drew Technologies CarDAQ Plus (01.08.06 / 01.08.06 / 04.04)
Actia PassThru+ XS (02.01 / 02.01 / 04.04)
Vetronix Corporation ES6510 Flasher (06.12 / 04.23 / 04.04)
EASE Diagnostics Universal Reprogrammer (JPI1_11b / 1.3.0.13 / 04.04)
Snap-On Pass Thru Pro (02.01 / 02.01 / 04.04)
Blue Streak Electronics Inc.BSE-2534 Global Programmer(01.21 / 02.27 / 04.04)

* Original validated firmware/DLL versions may be superceded by the device manufacturer. Contact the device manufacturer if you are unable to find the versions listed above.

Support OS:
OS Name and Version:
Windows 2000 SP2 or later
Windows XP Pro SP1 or later

For more information about the J2534 devices listed above, contact the vendors. To report compatibility problems with listed hardware/software, please contact the device manufacturer.

For more information about Toyota vehicle reprogramming CDs or to report problems running Toyota's Calibration Update Wizard software, please contact Toyota.

OBTAINING A CALIBRATION CD
The Calibration CD is compatible with the above mentioned scantools and J2534 interfaces. A Calibration CD contains all of the most current vehicle calibration files, applicable TSBs, the Calibration Update Wizard application software for a Windows PC, and instructions for use.

Calibration CDs can be ordered through the Toyota Material Distribution Center; order P/N 00456-REPRG-001.

IMPORTANT NOTICE
It is possible to permanently damage a vehicle controller during the flash reprogramming process. It is especially important to understand that once started, the reprogramming process must not be interrupted, reprogramming devices must not be disconnected and PCs must not be allowed to go into standby, hibernation or similar power management modes. The information provided herein is intended expressly for use by qualified professional automobile technicians. To prevent damage to your customer's vehicle and ensure safe service practice, read these materials completely and thoroughly before servicing the vehicle and be sure to follow all instructions.

I would try clearing codes then just turn the key on to see what codes come up if none, start it for a second and check again.

https://youtu.be/ahK_eucFi-k

Check out the diagrams (below). Please let us know what happens.
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Sunday, December 8th, 2019 AT 5:54 PM
Tiny
DIAKPO
  • MEMBER
  • 34 POSTS
The reason I changed it initially was because while accelerating, the car used to jerk sporadically.
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Sunday, December 8th, 2019 AT 5:58 PM
Tiny
DIAKPO
  • MEMBER
  • 34 POSTS
Also, I saw wire hanging loose from where the ECM is supposed to be located. It seemed paired with another wire. The symptoms improved. Is what I did safe?
Also the car exhibits this in the morning and when I have parked it for some hours. During the day it runs fine.
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Sunday, December 8th, 2019 AT 6:20 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Ken has a good suggestion of clearing the codes and seeing what returns. There is a chance that some of them are old and could lead us down the wrong path. The fact that this happens when it is cold is an indicator that a sensor could be coated with dirt or other contamination and once it warms up it starts reading accurately. However, let's go with what Ken said and see what comes back when the vehicle acts up. That will give us a better idea as to what is happening. However, as Ken said, if these come back I doubt the one sensor is causing all these issues.
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Sunday, December 8th, 2019 AT 6:56 PM
Tiny
DIAKPO
  • MEMBER
  • 34 POSTS
Great advice. I just want to say. Thank you guys. Thanks so much. I am truly grateful.
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Monday, December 9th, 2019 AT 2:42 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
We hope to help, please let us know ;)
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Monday, December 9th, 2019 AT 10:07 AM
Tiny
DIAKPO
  • MEMBER
  • 34 POSTS
Thanks so much. The mechanic took out the throttle body and cleaned it with carb cleaner. Problem solved. Thanks you guys
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Sunday, January 12th, 2020 AT 2:50 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help.
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Monday, January 13th, 2020 AT 11:05 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Great news. Thanks for the update. I’m sure that info will help others. Please come back and use 2CarPros in the future.
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Monday, January 13th, 2020 AT 1:54 PM

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