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Need some Help Here ?

Trouble Codes................Po-238


Trouble Codes................PO-603
 

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P0238 is the map sensor on the firewall. I would only go OEM on this if you decide to replace it.

P0603 happens whenever you disconnect the power from the PCM or disconnect the batteries.
 

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For P0238 see the appropriate pinpoint test (KOEO or Continuous):

D15 KOEO DIAGNOSTIC TROUBLE CODE (DTC) P0238
DTC P0238 indicates turbo boost sensor A circuit high input.
Possible causes:
damaged MAP sensor
damaged PCM
Disconnect MAP sensor connector.
Connect the MAP sensor tester between the vehicle harness connector and the MAP sensor.
Insert the MAP sensor tester banana plug into a digital multimeter. Set digital multimeter to frequency scale.
Key on/engine off.
Is frequency reading above 125 hz?
Yes REPLACE MAP sensor. CLEAR DTCs and RETEST.
No REPLACE PCM. CLEAR DTCs and RETEST.



D24 CONTINUOUS DIAGNOSTIC TROUBLE CODE (DTC) P0238
DTC P0238 indicates turbo boost sensor A circuit high input. This code was set under normal driving conditions.
Possible causes:
damaged MAP sensor
damaged circuit
Disconnect MAP sensor connector.
Connect MAP sensor tester between the vehicle harness connector and MAP sensor.
Insert MAP sensor tester banana plug into a digital multimeter.
Set digital multimeter to frequency scale.
Key on, engine off.
Observe frequency reading while tapping on sensor.
Does frequency reading go above 125 hz?
Yes REPLACE MAP sensor. CLEAR DTCs and RETEST.
No GO to D25 .

D25 CHECK MAP SENSOR
Apply 69 kPa (10 psi) of pressure with vacuum/pressure pump from Rotunda Pressure Adapter Kit 014-00761 or equivalent. Observe frequency reading while tapping on sensor.
Does frequency reading go above 300 hz?
Yes REPLACE MAP sensor. CLEAR DTCs and RETEST.
No GO to D26 .

D26 MAP HARNESS CHECK
Using a vacuum pump from Rotunda Pressure Adapter Kit 014-00761 or equivalent, apply 33 kPa (10 in-Hg) of vacuum. Observe frequency reading while performing the following:
Grasp the vehicle harness close to the sensor connector.
Wiggle and shake the vehicle while working toward the PCM.
Does frequency reading go above 300 hz?
Yes REPAIR intermittent circuit failure. CLEAR DTCs and RETEST.
No FAILURE is intermittent. Unable to duplicate at this time. CLEAR DTCs.

Cheers!
 
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