OBD II Fault Code P1901 :

Description of Fault code P1901

ATFP-RELAY CONTROL CIRCUIT LOW

Possible failuer P1901

• ATFP Relay Failure OFF
• The Power Supply line to ATFP is Open
• ATFP Relay Circuit Open
• ATFP driver malfunction

Diagnostic Procedure using AutoHex II Scan Tool

• A malfunction is detected when the voltage doesn't increase with a ON command.
• ATFP driver monitors and detects a malfunction. If the ATFP driver detects a malfunction, it will send the result to the PCM.

Test Conditions using AutoHex tester

• Start the engine, wait 10 seconds.

Clear Fault codes Conditions

• A malfunction is detected when the voltage doesn't increase with a ON command.
• ATFP driver monitors and detects a malfunction. If the ATFP driver detects a malfunction, it will send the result 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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