OBD II Fault Code P1903 :

Description of Fault code P1903

ATFP V-phase LINE CIRCUIT HIGH

Possible failuer P1903

• ATFP V-phase LINE CIRCUIT is open.
• ATFP Motor Malfunction
• ATFP Control unit malfunction

Diagnostic Procedure using AutoHex II Scan Tool

• The ATFP Control unit monitors V-phase the current when the ATFP Motor is running.
• A malfunction is detected when no current in the V-phase for at least 5 seconds.
• The ATFP driver monitors and detects the malfunction. If the ATFP driver detects a malfunction, it will send the failure information to the PCM.

Test Conditions using AutoHex tester

• Shift lever position is D
• Warm up the engine, drive in D range, stop the vehicle ,and go into idle stop.

Clear Fault codes Conditions

• The ATFP Control unit monitors V-phase the current when the ATFP Motor is running.
• A malfunction is detected when no current in the V-phase for at least 5 seconds.
• The ATFP driver monitors and detects the malfunction. If the ATFP driver detects a malfunction, it will send the failure information to the PCM.

MIL Status

• America/Canada Spec OFF

Note:

• AutoHex II is a professional Auto diagnostic.
• This fault code is a GERENRIC fault code, some cars may change the meaning of this fault code.
  To get the accurate fault code description you may use AutoHex II

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