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2.3L ('02-'11) Check engine light question


TrevWard

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Ames, Iowa
Vehicle Year
Ford Ranger
Make / Model
2010
Transmission
Automatic
I have a check engine light on. I took my 2010 Ranger ( XL/XLT Supercab 2.3L) to AutoZone to run a diagnostic on the check engine light.

Here is the result:
PO108 Manifold Absolute Pressure (MAP) BARO Sensor High Input
PO453 Evaporative Emission System Pressure Sensor/Switch High Input
PO643 Sensor Reference Voltage A Circuit High.

Has anybody had similar issues, if so, what is the fix?

Thanks,
 


Rock Auto 5% Discount Code: 7FA902352B4C01: April 5th, 2021

RonD

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Welcome to TRS :)

First one to deal with is P0643, this is a PCM(computer) issue, so other 2 codes may not be "real" or are caused by this fault in the PCM

One possibility is a shorted sensor or sensor wire

The PCM has a 5volt output voltage that is SHARED with most engine sensors, P0643 could be this 5volt wire is shorted some where so voltage is low

Easiest place to test this 5 volts is at the TPS(throttle sensor)
Unplug its 3 wire connector
Turn key on, engine OFF
Test all 3 wires for 5volts using engine as ground

Its usually the top wire but................green/white or green/purple wire

If there is no 5volts then unplug MAP sensors(P0108) 3 wire connector and see if voltage returns or comes up
 

TrevWard

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Joined
Feb 26, 2021
Messages
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Location
Ames, Iowa
Vehicle Year
Ford Ranger
Make / Model
2010
Transmission
Automatic
Thanks for the thorough and quick reply.
 


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