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Engine runs but does not accelerate

Tiny
CZAR ALVARADO
  • MEMBER
  • 2002 SATURN L300
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 234,500 MILES
Suddenly being on the road the car stop accelerating but did not turn off. Checked voltage on TPS harness and voltage on MAF sensor and throttle pedal harness. Maybe the ECM is broken?

estando en carretera el vehiculo dejo de acelerar pero no se apago, revise arnes del sensor tps y arnes del sensor maf y ambos fueron correctos, asi como el arnes del sensor del acelerador, podria ser la ecm dañada?
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Thursday, March 28th, 2019 AT 1:55 PM

7 Replies

Tiny
JOETECHPRO
  • MECHANIC
  • 705 POSTS
Hey CZAR ALVARADO,

Can you please follow the guide below to check for codes:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Starting with fault codes is the best way to narrow down diagnosis.

What readings were you getting from the voltage measurements you have taken?
Where were you measuring, from which pin to where?

Regards, Joe
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Thursday, March 28th, 2019 AT 5:28 PM
Tiny
CZAR ALVARADO
  • MEMBER
  • 4 POSTS
Took the measurement form the TPS harness on the brown and yellow wire. I have the full diagram of the Saturn, soy made some test according to the cars manual, I don't remember right now the exact voltage, I guess 4.5 to 6 on brown wire and 2 more or less on the yellow wire. I tried to check the obd2 connector its a SAE J1850 VPW, last scanner show U2106 code, it is a problem with communication to ECM. Can you help me? Thank you. :) Below shows you a picture of the connector and the diagram.
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Monday, April 1st, 2019 AT 3:02 PM
Tiny
JOETECHPRO
  • MECHANIC
  • 705 POSTS
Hey CZAR ALVARADO,

It looks like the U2106 is a communication code for loss of signal from the TCM.
The TCM communicates with the BMC and ECM and when there is a missing message it logs this code.

The first thing to do is to check the fuses, power and ground to the ECM, TCM and BCM to ensure all are present.

I have attached a diagnosis guide for the U2106 code.
Is this the only code you have stored?

Regards, Joe
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Monday, April 1st, 2019 AT 4:13 PM
Tiny
CZAR ALVARADO
  • MEMBER
  • 4 POSTS
Before this happened had three or four codes, like fail on 3 cylinder, fail on TCC solenoid, but it is an old car and my budget is short, so am try to do all by myself. :) When stop acceleration a guy came and use is scanner and appear that code u2106 so can do anything else, honestly I do know about the BCM and TCM, I am going to check that next Saturday, because work all week. Thank you very much for your support.
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Monday, April 1st, 2019 AT 6:17 PM
Tiny
JOETECHPRO
  • MECHANIC
  • 705 POSTS
Hey CZAR ALVARADO,

No problem, we can definitely run you through more checks and find a route to fixing the issue.

With the vehicle stationary do you get any response from the gas pedal?
Is the engine idling smoothly or misfiring?

Let me know how you go with the testing.

Regards, Joe
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Monday, April 1st, 2019 AT 10:04 PM
Tiny
CZAR ALVARADO
  • MEMBER
  • 4 POSTS
Well, when start vehicle yes, they had some idling, and no, not response for the gas pedal at all. Next time I am going to show you a video, think it a better way. Last Saturday checked all the fuse that I find, and only change the fuse of the driver seat.
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Tuesday, April 2nd, 2019 AT 12:00 PM
Tiny
JOETECHPRO
  • MECHANIC
  • 705 POSTS
Hey CZAR ALVARADO,

Please do upload a video it may be a more efficient way to explain your fault.

It sounds like the electronic throttle actuator is not working.

In which case you should have a code for the throttle pedal position or the electronic throttle actuator/position sensors.

Please recheck for codes.

Try removing the intake and watching the throttle plate. If you switch the ignition on (engine not running) and wait thirty seconds the throttle plate should move and run a relearn procedure.

Let me know if you get any movement at all.

Regards, Joe
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Tuesday, April 2nd, 2019 AT 2:49 PM

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