Nissan Altima 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.

    P1723 CVT speed sensor function
    Description The vehicle speed sensor CVT [output speed sensor (secondary speed sensor)] detects the revolution of parking gear and generates a pulse signal. The pulse signal is sent to the TCM, ...

    P1740 lock-up select solenoid valve
    Description • Lock-up select solenoid valve controls lock-up clutch pressure or forward clutch pressure (reverse brake pressure). • When controlling lock-up clutch, the valve is turned OFF ...

    Other materials:

    P0850 PNP Switch
    Description When the selector lever position is P or N, park/neutral position (PNP) signal from the TCM is sent to ECM (CVT models). When the selector lever position is Neutral position, park/neutral position (PNP) switch is ON. ECM detects the position because the continuity of the line ( ...

    Subwoofer (coupe)
    Description The audio unit sends audio signals to the BOSE speaker amp. The BOSE speaker amp. amplifies the audio signals before sending them to the subwoofers using the audio signal circuits. Diagnosis Procedure 1.HARNESS CHECK 1. Disconnect BOSE speaker amp. connector B122 and suspect re ...

    Air breather hose
    Exploded View 1. Air breather hose 2. Clip 3. Bracket 4. Air breather tube 5. CVT assembly A. Paint mark Removal and Installation Refer to the figure for removal and installation. CAUTION: • Install air breather hose with paint mark facing upward. • Insert air breather hose a m ...