Nissan Sentra Service Manual: P1225 TP Sensor

Nissan Sentra Service Manual / Engine / Engine control system / Dtc/circuit diagnosis / P1225 TP Sensor

DTC Logic

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detecting condition	Possible cause
P1225	CTP LEARNING-B1 (Closed throttle position learning bank 1)	Closed throttle position learning value is excessively low.	Electric throttle control actuator (TP sensor 1 and 2)

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 10 V at idle.

>> GO TO 2.

2.PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON.
Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Check 1st trip DTC.

Is 1st trip DTC detected? YES >> Proceed to EC-372, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY

Turn ignition switch OFF.
Remove the intake air duct. Refer to EM-25, "Exploded View".
Check if foreign matter is caught between the throttle valve and the housing.

Is the inspection result normal? YES >> Replace electric throttle control actuator. Refer to EM- 27, "Removal and Installation".

NO >> Remove the foreign matter and clean the electric throttle control actuator inside, then perform throttle valve closed position learning. Refer to EC-139, "Work Procedure".

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System description
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