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:
P0117, P0118 ECT sensor
Description
The engine coolant temperature sensor is used to detect the engine
coolant temperature. The sensor modifies a voltage signal from the
ECM. The modified signal returns to the ECM as the engine coolant
temperature input. The sensor uses a thermistor which is sensitive to
the change i ...
Engine oil
Changing Engine Oil
WARNING:
• Be careful not to burn yourself, as the engine oil may be hot.
• Prolonged and repeated contact with used engine oil may cause skin cancer: try
to avoid direct skin
contact with used oil. If skin contact is made, wash thoroughly with soap or
hand c ...
Multiport fuel injection system
System Diagram
System Description
INPUT/OUTPUT SIGNAL CHART
*1: This sensor is not used to control the engine system under normal
conditions.
*2: This signal is sent to the ECM via the CAN communication line.
*3: ECM determines the start signal status by the signals of engine speed an ...