If your getting tps codes then it's either not getting the correct voltage or you didn't recalibrate the new sensor. Check the service manual there should be a method to reset the tps sensor

 

I see your point but those codes were present before the tps was replaced. Not only that but what else would be causing the tps and the camshaft position sensors(both) to be coding?

 

Camshaft position sensors were replaced. Computer was reset back to Infiniti standards. It still has the same codes. I believe this an electrical issue, but I don't know where to start.

 

What year is your car? Step number 1, download the FSM: http://www.nicoclub.com/FSM/G35/Coupe/2004/ec.pdf

P0300 = MULTI CYL MISFIRE
Listed possible causes in previous post

P1121 = ETC ACTR (Electric throttle control actuator)
Possible cause: Electric throttle control actuator

P1122 = ETC FUNCTION/CIRC (Electric throttle control performance problem)
Possible cause: Harness or connectors (Throttle control motor circuit is open or
shorted)
Electric throttle control actuator
NOTE: If DTC P1122 is displayed with DTC P1121 or 1126, first perform the trouble diagnosis for DTC P1121 or P1126.

P1123 = doesn't exist. If is really P1128, then that is Throttle control motor circuit short

P0123 = TP SEN 2/CIRC (Throttle position sensor 2 circuit high input)
Possible cause:
* Harness or connectors
(TP sensor 2 circuit is open or shorted.) (APP sensor 2 circuit is shorted.)
*Electric throttle control actuator (TP sensor 2)

*Accelerator pedal position sensor (APP sensor 2)


Since P1121, Throttle Control Actuator is the primary failure here, here's the diag procedure:

1. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
a. Remove the intake air duct.
b. Check if a foreign matter is caught between the throttle valve and the housing.
OK or NG
OK >> GO TO 2.
NG >> Remove the foreign matter and clean the electric throttle
control actuator inside.

2. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
a. Replace the electric throttle control actuator.
b. Perform EC-42, "Throttle Valve Closed Position Learning" .
c. Perform EC-42, "Idle Air Volume Learning" .

 

LoSt180 every sensor has been replaced and reset that you have listed. I'm still getting the same codes. My mech believes it to be electrical. Something in the engine harness has a break in it. I don't know if it would be cheaper to find the wires causing the problems or replace the engine wiring harness?

 

The "Throttle Control Actuator" is commonly called the throttle body. Since that has been replaced, I'd verify it's good (if used might have also been bad), then I'd get a multi-meter and start checking resistance and voltage measurements per the FSM instructions that I linked above.

If you have to pay someone to check the wires for you, then it comes down to a cost analysis of how many hours to pay a mechanic vs how much a harness costs. I just hope a short didn't cause damage to the ECM.

 

He has used all new sensors and done a reset on them each. Unfortunately, he is a mechanic down now and it would take too much time that neither of us have to fix the problem. I'm sorry to say that the car is going to Satan Monday.