P1800 transmission clutch interlock saftey switch circuit

have you done anything to fix the fault that caused the code
if not then logically the code will reappear until you go

Trouble Code:
System:
Subsystem:
P1723 - (Manufacturer Specific)
Powertrain
Transmission Controls

DTC Description: Starter Interlock Circuit Open

Location:
Analysis:
Likely Cause:


Open Circuit
Possible clutch switch if manual transmission.

I do not recommend remote start systems for manual transmissions. You would have to bypass the clutch interlock to enable the starting circuit. If you left the vehicle in gear and used the remote you could do damage to the vehicle or other property (hopefully the parking brake holds the car in place). I have never seen a factory remote system on a manual transmission, to much liability....

I presume you mean the clutch interlock switch on the pedal assembly. There is no neutral safety switch for a manual transmission. The interlock switch requires the clutch to be pressed when starting.

The switch has two 12mm (or 14mm?) nuts to adjust the position of the switch. There's a wiring harness connector so the switch and short cable can be removed.

SD

If it doesn't even turn over, have you checked safety neutral switch?

CODE PO1800 VIAS CONTROL SOLENOID VALVE CIRCUIT. I DID NOT SEE CODE PO650 BUT CODE PO1800 IS A FAULTY VIAS CONTROL SOLENOID VALVE.

You may want to have someone else take a look at it. The Nissan P1800 trouble code is not a transmission control problem. It is described as follows:

Trouble diagnosis name: VIAS control solenoid valve circuit.
Component Description:
The VIAS control solenoid valve cuts the intake manifold vacuum signal for power valve control. It responds to ON/OFF signals from the ECM. When the solenoid is off, the vacuum signal from the intake manifold is cut. When the ECM sends an ON signal the coil pulls the plunger downward and feeds the vacuum signal to the power valve actuator.
DTC detecting condition:
•An excessively low or high voltage signal is sent to ECM through the valve.
Possible cause:
•Harness or connectors (The solenoid valve circuit is open or shorted.)
•VIAS control solenoid valve

Check your vacuum hoses to make sure they are in good shape and are securely attached Aslo check the wiring harness is ok and securely attached as well. If they are, you’ll probably need to replace your VIAS. It's right next to the throttle body.

Transmission Clutch Interlock Safety Switch Short Circuit To Ground.
Thats what the error code means.
Beyond the scope of a DIY person.
Tools and knowledge of transmissions needed.
Hope this helps

Look into the clutch interlock saftey switch

you have civic SI type R with the K20A engine and 6sp transmission? correct?

yes the clutch is adjustable.

1. loosen the clutch pedal position switch(lower of the 2 switches) locknut and back off the clutch pedal position switch.
2. loosen the clutch push-rod locknut and turn the push-rod in or out to get the desired height and stroke of the pedal.
3. tighten the push-rod locknut
4. with the clutch pedal released, turn the clutch pedal position switch in until it contacts the clutch pedal.
5. turn the clutch pedal position switch in an additional 3/4 to 1 turn.
6. tighten the clutch pedal position switch locknut.
7. loosen the clutch interlock switch(the upper switch) locknut and then the interlock switch.
   
8. press the clutch pedal to the floor.
9. release the pedal about 1/2 in. from the fully depressed position, and hold it there. adjust the position of the interlock switch so that the engine will start with the clutch pedal in this position.
10. tighten the interlock switch locknut.

clutch pedal stroke should be: 5.1 - 5.5 in
clutch pedal height should be: 7.76 in

if adjusting the clutch doesn't help with the transmission feeling notchy, may be the syncros.