Nissan Altima (L32) 2007-2012 Service Manual: P1726 electric throttle control system

Description

Electric throttle control actuator consists of throttle control motor, accelerator pedal position sensor, throttle position sensor etc. The actuator sends a signal to the ECM, and ECM sends the signal to TCM with CAN communication.

DTC Logic

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

NOTE: If “DTC CONFIRMATION PROCEDURE” has been previously performed, always turn ignition switch OFF.

Then wait at least 10 seconds before performing the next test.

1.CHECK DTC DETECTION

1. Start engine and let it idle for 5 seconds.

2. Perform “SELF-DIAG RESULTS” mode for “TRANSMISSION”.

Is “P1726 ELEC TH CONTROL” detected? YES >> Go to TM-180, "Diagnosis Procedure".

NO >> Check intermittent incident. Refer to GI-42, "Intermittent Incident".

Diagnosis Procedure

1.CHECK DTC WITH ECM

1. Turn ignition switch ON.

2. Select “SELF-DIAG RESULTS” mode for “ENGINE”.

Is the inspection result normal? YES >> GO TO 2.

NO >> Check DTC Detected Item. Refer to EC-1555, "DTC Index".

2.CHECK DTC WITH TCM

Perform “SELF-DIAG RESULTS” mode for “TRANSMISSION”.

Is “P1726 ELEC TH CONTROL” detected? YES >> Replace TCM. Refer to TM-254, "Exploded View".

NO >> GO TO 3.

3.DETECT MALFUNCTIONING ITEMS

Check TCM connector pin terminals for damage or loose connection with harness connector.

Is the inspection result normal? YES >> Replace TCM. Refer to TM-254, "Exploded View".

NO >> Repair or replace damaged parts.