Help! Trouble Codes P0102, P0113, P0118, P0123 (and P2118)

Hi I'm new around here. This original post is from an inquiry over on tacomaworld. I was thinking it might be a little more relevant to post here (I'm a taco guy but working on a 4Runner in this case).

Link is:
https://www.tacomaworld.com/threads/help-trouble-codes-p0102-p0113-p0118-p0123-and-p2118.849934/#post-3036736

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Overview:
Ok Tacomaworld, I was hoping the group-think around here could help me out. My father has a 2016 4Runner (Trail Premium) that he was washing after a splendid trip to Colorado. He was spraying down the engine bay and now the truck is stuck in limp mode. It runs rough, not above ~2000rpm, and it smells rich. A local shop that specializes in Asian makes had the truck for a while and couldn't figure out the issue. They replaced the throttle body and that seemed to fix one code but they were otherwise of no help. (The tech also failed to bolt down the airbox, fusebox, and didn't clip the interior trim around the glovebox correctly so I'm not too impressed with their work.) Currently, the 4Runner is at home and I'm slowly working on diagnosing things but I'm a bit baffled. Any help or ideas would be much appreciated, thanks in advance.

The Issues:
P0102 - Mass Air Flow Circuit Low
P0113 - Intake Air Temperature Circuit High Input
P0118 - Engine Coolant Temperature Circuit High Input
P0123 - Throttle/Pedal Position Sensor/Switch "A" Circuit High Input
P2118 - Throttle Actuator Control Motor Current Range/Performance (seems to be fixed with a throttle body replacement)

What I've done so far:
I'll admit I'm a nobody when it comes to this stuff (a mechanical engineering student in uni), but I'm trying my best here. Please be nice lol.

I've been operating under the assumption that there are 3 possible issues here: the ECU/ECM, the sensor(s) in question, or the wiring in between.

1. The shop replaced the throttle body and actuator assembly and that seemed to fix P2118. But for a couple $k I could've done that myself thank you.

2. So far I have swapped in another ECU to no avail. Nothing changed and I doubt both ECUs are bad.

3. I've swapped the throttle pedal for a different one, and nothing changed. I pulled up techstream and I got the following values with a battery voltage of 12.148V.

At 0% throttle, Sensor 1 Voltage was at 15.6% and Sensor 2 Voltage was at 32.1%
At 100% throttle, Sensor 1 Voltage was 69.8% and Sensor 2 Voltage was at 85.4%

According to the TIS RM I should get this:


So the voltages the ECU is getting back from the pedal are way high? Not sure what to make of that. I can't really tell how the pedal works but is it pegged off of a reference voltage? Could that be too high?
4. With the engine off the MAF is reading 0.75 gm/sec which is within the 0.93 g/sec limit specified by the RM while in that state. No leads here? I do have another MAF on the way cause it's relatively cheap that I'll swap in.

What I'm planning on doing:
1. I've got the pinouts for the connectors to the MAF/Coolant Temp Sensor/Pedal/Throttle Actuator/ECU from the EWD. I'm planning on checking each for open circuit and short-circuit conditions.

2. I'd like to check the ECU's ground circuit. However, I'm not quite adept yet at reading Toyota's EWD yet and I wasn't really sure which pins ran to ground. For example, if I see an image like this does that mean pins 15,11,10,16, and 18 on connector B39 run to ground connector B2 (in the engine bay)? And how do I interpret codes like E02, ME01, etc.? Am I even barking up the right tree? The RM mentions this as part of the electronic circuit inspection procedure.



3. I think I'll go through and check all the grounds in the engine bay and in the "instrument panel". I have the diagrams for those printed out as well.

Again any suggestions or help would be greatly appreciated! Thanks!

 

Well...I have the same issue and codes on my tundra. Any update?

 

Have you physically removed and checked/cleaned all electrical connections in and around where the pressure washing took place, Just in case you had some water intrusion?
I assume the 4runner performed fine before cleaning the engine bay?

 

Yes we got the problem fixed thanks to some help on tacomaworld. I’ve linked the thread below. TLDR; a pin supplying BM power to the ECU broke off.

https://www.tacomaworld.com/threads/help-trouble-codes-p0102-p0113-p0118-p0123-and-p2118.849934/

 

Ok, awesome! Thank you!