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Old 07-02-2019, 09:06 PM #1
philbo_baggins philbo_baggins is offline
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Help - '02 Engine Code P1633

Hello all,

I would like to pick your brain before I go about getting a refurb ECM for my 2002 4runner. I have searched anything I could think of and tried everything I found within my ability, so here goes...

'02 SR5 with 156k miles, new to me. I bought it and was told that the ECM was bad and needed replaced. Symptoms were that car would start and run fine with no engine codes (seemingly normal throttle response and acceleration, but I don't have anything to compare it to). After you shut off the motor, you can turn it back on fine, but the check engine light stays on and the VSC and Trac lights stay on. Engine code is P1633 ECM malfunction (ECTS Circuit). If you "reset" the ECM by pulling a fuse or disconnecting the battery, the codes reset and the car works normally again.

So, I don't think I remember all the things I've checked but they have included: checking for continuity through the ECTS circuit, checking fuses, checking voltage going to ECM of +BM, checking the operation of the TPS, throttle motor, cleaning throttle body, cleaning the MAF sensor, replacing spark plugs and wires...that's all I can remember off the top of my head.

Again, the car works fine the first time it turns on (which makes me think its not a faulty part besides the ECM). Any other suggestions of things to check before dropping $400 in a refurbished unit?

Thanks for the help.
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Old 07-02-2019, 09:25 PM #2
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found this link:

P1633 Engine Trouble Code - P1633 OBD-II Diagnostic Powertrain (P) Trouble Code | Engine-Trouble-Code.com

These are some areas to check also if you end up getting one from a wrecking yard may consider pulling anything that the above link says to check like O2 sensor.

If you know some one with a same model ECM you could try putting yours in there car it would be safer than putting there's in yours. If your system wiring has a short that caused the ECM to go bad it will show up in the other car but if you have a short in yours it could damage there ECM. Just Saying...
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Old 07-02-2019, 10:04 PM #3
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Quote:
Originally Posted by plcfcng View Post
found this link:

P1633 Engine Trouble Code - P1633 OBD-II Diagnostic Powertrain (P) Trouble Code | Engine-Trouble-Code.com

These are some areas to check also if you end up getting one from a wrecking yard may consider pulling anything that the above link says to check like O2 sensor.

If you know some one with a same model ECM you could try putting yours in there car it would be safer than putting there's in yours. If your system wiring has a short that caused the ECM to go bad it will show up in the other car but if you have a short in yours it could damage there ECM. Just Saying...
Hm, interesting. Thanks for looking for me. That's not a website that I found or info that I've been looking at. The only thing I'd say is that I've read that this engine code means different things for different maufacturers, and toyota is the "ECM malfunction (ECTS circuit"

As for the other ECM, I don't know anyone with the same model, but that is not a bad idea...I may know someone with one that would work. I did purchase a unit from car-parts or ebay with the same model # but I don't think the VINs match up so it doesn't let me start the car (and I haven't been able to figure out how to reset that VIN cheaply)
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Old 07-02-2019, 10:19 PM #4
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ebay has a listing refurbishing your ECM for 89.00.
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Old 07-02-2019, 10:31 PM #5
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Quote:
Originally Posted by philbo_baggins View Post
Hm, interesting. Thanks for looking for me. That's not a website that I found or info that I've been looking at. The only thing I'd say is that I've read that this engine code means different things for different maufacturers, and toyota is the "ECM malfunction (ECTS circuit"

As for the other ECM, I don't know anyone with the same model, but that is not a bad idea...I may know someone with one that would work. I did purchase a unit from car-parts or ebay with the same model # but I don't think the VINs match up so it doesn't let me start the car (and I haven't been able to figure out how to reset that VIN cheaply)
Yeah, here is the '02 Toyota FSM. Not much choice. Get a new ECM.

http://www.teamtoyota4x4.org/archivi...fe/cip1633.pdf

It's a long shot, but I always double check the engine ground by the diagnostic plug on any code I can't otherwise fix. Remove, clean, replace. It loves to cause weirdness, and it's a free fix if it works.
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Old 07-03-2019, 09:15 AM #6
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Quote:
Originally Posted by TheDurk View Post
Yeah, here is the '02 Toyota FSM. Not much choice. Get a new ECM.

http://www.teamtoyota4x4.org/archivi...fe/cip1633.pdf

It's a long shot, but I always double check the engine ground by the diagnostic plug on any code I can't otherwise fix. Remove, clean, replace. It loves to cause weirdness, and it's a free fix if it works.
Yeah, I'll definitely check that. Thanks for the suggestion! Unfortunately that is a lot of what I've been seeing too...just replace the ECM
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