2007 XC90 Sputtering and won't go above 1600 RPM [Solution, shorted wires]

[abscate]

This is a 3.2 engine. After clearing codes and then restarting I get 5 codes:

1 - P064300 Sensor Reference Voltage A Circuit High General Failure
2 - P061B64 Internal Control Module Torque Calculation Performance. Algorithm Based Failures. Signal Plausibility failure
3 - P022023 Throttle/Pedal Position Switch B Circuit. General Signal Failures. Signal stuck low.
4 - P177100 Throttle Position Sensor Circuit High Input.
5 - P157300 Throttle Position Not Available

Enough for me to inspect wiring and then try a used electronic throttle actuator.

New is $700

So used should be about $200 or fewer shiekels

[MRSCOTTPERRY]

Tested connector to Throttlebody - 5v reference pin is at 12v so must have a short somewhere. Disconnected most everything to find a bad sensor but no go. Jiggled many wires - no go.

[foosrookie]

"ECM-P064300
Engine control module motor (ECM) checks the internal end-stage for 5 volt feed.
If voltage becomes too high or too low, the diagnostic trouble code is generated.
The diagnostic trouble code can be diagnosed when the ignition is on.
Substitute value
Nothing
Possible source
Signal cable for connected component short-circuited to voltage
Open circuit on signal cable for connected component.
Signal cable for connected component short-circuited to ground.
Damaged engine control module (ECM).
Fault symptom
Uneven idle.
High emissions
Poor performance.
Engine stops while driving."


I found a lot of wrong information in the factory service manual for this vehicle. This includes some info for this DTC. Below are the corrections to this code.

ECM-P064300
Engine control module (ECM) checks the internal end-stage for 5 volt feed.
If voltage becomes too high, this diagnostic trouble code is generated.
The diagnostic trouble code can be diagnosed when the ignition is on.

Substitute value
Nothing

Possible source
Signal cable for connected component short-circuited to battery voltage
Open circuit on signal cable for connected component.
5 volt reference (feed) short-circuited to battery voltage
Damaged Engine Control Module (ECM).

Fault symptom
Uneven idle.
High emissions
Poor performance.
Engine stops while driving.

[MRSCOTTPERRY]

UPDATE - Problem resolved - 12v was shorted to 5v wire. Wire bundle rubbing on top of engine. 5 wires needed to be spliced.

[abscate]

Could you post a picture of the affected wiring so we know where to look for this fault?

Thanks for the follow up and adding to the knowledge base


‘Diagnostics, saved the day.

[MRSCOTTPERRY]

Just added pics at top of original post.

[abscate]

Thanks. Loading thumbnails here for archiving