Topic: Accelerator Position Sensor vs. Throttle Position Sensor readings - Help, please

[Chemist]

I have had some intermittent throttle body codes thrown over the past few times I've driven the car:

P1516 Throttle Actuator Control Module Throttle Actuator Position Performance
P2120 Accelerator Pedal Position Sensor 1 Circuit
and
P2176 Minimum Throttle Position Not Learned

The first two appeared on three occasions, the third on two of those three.

Today, I ran my DashHawk over to the screen where these things are monitored and saw that the two throttle position sensors never differ by more than 1%. One of the two accelerator pedal position sensors is 1-2% from those two (matching) readings. The second accelerator sensor, however, only reads half the value of the first. With the car off, but the DashHawk still running, I can press the accelerator pedal and the 2nd sensor reading is consistently one-half the % of the 1st. Is this normal, or is my pedal sensor going the way of all physical things?

If someone has a DashHawk (or another OBD-II monitor) and could see how their two accelerator position sensor readings perform, I would greatly appreciate it. BTW, I'm driving a 2006 NA with DDM SC, but that should not make a difference.

Thanks.

--Chemist

[ihawk95]

Byron, why aren't you in Austin? Thought for sure you'd be there.

If I were at work, I had data there that might help, but all I could do is look at it and tell ya what I see. Don't know what everything should be though. Good luck!

Hope you kids are doing fantastic!

[Chemist]

This is why I'm not in Austin. These codes throw you into Reduced Power mode. I'm not confident to leave town until I diagnose this. I'm doing web research and am fairly sure it faulty. I'll contact my son-in-law tomorrow. He's a (nearly) Master Tech with Toyota.

I would appreciate your getting me whatever data you can.

Thanks, Diana.

--Byron

[tazz]

Edit
Im logging different params than the ones you need.
I don;t have my DH right now but if it's the 2 Im thinking of that I also log with HPT mine are about the same way.
In HPT I log ETC pedal postion and ETC desired postion and there is usually a half corrolation but not always.  ECT desired at idle on my car usually is at 32% while pedal position is 0%.  Once you start moving though it does seem like pedal postion is roughly 1/2 of the desired position but it does vary.

[Chemist]

Thanks, Tazz. I'm going to try to track down one of the other owners here in town and see what theirs is doing. Most of them are in Austin right now, though. I appreciate your input. It did seem odd to me that they tracked at virtually exactly a 2:1 ratio. At idle, my throttle sensors are 19-20% each, Pedal sensor D (#1) is at 19% and Pedal sensor E (#2) is at 10%

If you can confirm that yours is that way, it will put me one step closer to an answer of what led to my Reduced Power mode episodes.

[Brad Kenny]

PM sent for help.

[tazz]

I'll see if i can change my HPT scanner to log those two params since the ones I log are different.
Might not help since yours is a 2.4 and mines the 2.0.

[Chemist]

A big thanks to CT Solstice for getting me comparable readings. It would appear that my pedal and its sensors are in good working order. The 2nd pedal sensor does indeed report at 50% of the 1st one.

I'll cast my net elsewhere.


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