What is input pulley speed of nissan altima

In a Nissan Altima, code P1574 typically indicates an issue with the ASCD (Automatic Speed Control Device) speed sensor A. This sensor is responsible for detecting the vehicle's speed and providing the necessary information for the ASCD system to function properly.
When this code appears, it usually means that there is a problem with the speed sensor itself, the wiring connected to it, or possibly a malfunction in the ASCD control unit. It can lead to issues such as the cruise control not working, the vehicle not maintaining a set speed, or other related problems.
To diagnose and fix this issue, you may need to perform the following steps:
1. Check the wiring and connections: Inspect the wiring harness connected to the ASCD speed sensor A for any signs of damage, corrosion, or loose connections. Make sure all connections are secure and free of debris.
2. Test the sensor: The ASCD speed sensor A itself may be faulty and need to be tested. You can use a multimeter to check the sensor's resistance and compare it to the manufacturer's specifications.
3. Check the ASCD control unit: If the sensor and wiring appear to be in good condition, the issue may lie with the ASCD control unit. Testing and potentially replacing this unit might be necessary.
4. Clear the trouble code: Once you've identified and resolved the underlying issue, you can clear the trouble code from the vehicle's system using an OBD-II scanner. This will reset the system and allow you to see if the problem persists.
If you are not comfortable performing these steps yourself, it's recommended to consult with a qualified mechanic or dealership with experience in diagnosing and repairing ASCD-related issues in Nissan vehicles. They can provide a more accurate diagnosis and solution to ensure your Nissan Altima's ASCD system operates correctly.

6. CHECK CKP SENSOR (POS) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 14 and CKP sensor (POS) terminal 2.continuity should exist. Refer to Wiring Diagram. 3. Also check harness for short to ground and short to power. OK or NG OK >> GO TO 7. NG >> Repair open circuit or short to ground or short to power in harness or connectors. 7. CHECK CRANKSHAFT POSITION SENSOR (POS) Refer to EC-326, "Component Inspection" . OK or NG OK >> GO TO 8. NG >> Replace crankshaft position sensor (POS). 8. CHECK GEAR TOOTH Visually check for chipping signal plate gear tooth. OK or NG OK >> GO TO 9. NG >> Replace the signal plate. 9. CHECK INTERMITTENT INCIDENT Refer to EC-147, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . >> INSPECTION END Component Inspection UBS002UJ CRANKSHAFT POSITION SENSOR (POS) 1. Loosen the fixing bolt of the sensor. 2. Disconnect crankshaft position sensor (POS) harness connector. 3. Remove the sensor. 4. Visually check the sensor for chipping.

Fault codes rarely cause any drivability related symptoms.
P0740 NISSAN - Torque Converter Clutch Solenoid Circuit Fault
Possible causes

• Low transmission fluid level
• Dirty transmission fluid
• Faulty torque converter clutch solenoid valve
• Torque converter clutch solenoid valve harness is open or shorted
• Torque converter clutch solenoid valve circuit poor electrical connection

• P0826 means there is an issue with a circuit for the up and down switch, usually due to a disabled manual shifter or TCM placed in Limo-in mode.
• The presence of a stored code P0725 means that the powertrain control module (PCM) has detected a circuit malfunction with the engine speed sensor input signal. The engine speed input sensor is sometimes called the transmission input speed sensor and the input speed sensor. This type of code may be caused by a mechanical problem or an electrical problem

It is part of the ignition system.

P0717 is for the transmission input speed sensor , which inturn will bring up the other code P0700 for the Trans Control Module , so i would suggest having the codes cleared and see if they come back as sometimes a glitch can occour , if codes reappear and so do the symptoms i would replace the input speed sensor , it reads the primary pulley speed and sends info to the TCM and as far as i know there are no diagnostic s to carry out as this sensor either works properly or fails so get it changed and hope its not the TCM as well, keep me posted if you wish

Here is a thread at a Nissan forum that covers this as it happens often.

2005 Altima P0335 and P0725 errors Nissanhelp com Forums

The speed sensor is probably disconnected or the wiring was damaged. The CPU needs this input to demand shifts.

I’m happy to assist further over the phone at https://www.6ya.com/expert/samuel_dda9c48bb7ffbfd3

Trouble Code: P1715

A/T Primary Speed (Input) Sensor Circuit Malfunction
Possible Causes:


CAN bus circuit from the TCM to PCM is open or shorted Input speed (primary) sensor circuit is open or damaged TCM has failed

This P0507 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle. In this case, the P0507 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is greater than the desired (pre-programmed) RPM. In the case of GM vehicles (and possibly others) if the idle speed is over 200 rpm higher than expected, this code will be set.

PO725 = Engine Speed Input Circuit
PO335= Crankshaft Position Sensor A Circuit