Has anyone ever heard of a car throwing all those codes at once? ive checked the grounds and inspected all the plugs to the sensors and the wires. they all appear to be fine. could this be caused by a malfuncting ECU?

 

ECT and IAT use related ECU circuitry. TPS and VTEC Pressure also use related circuitry so you may have 2 damaged circuits in your ECU causing the 4 codes.

I'd start out by swapping the ECU and if the codes stay, then I'd test the sensor connectors for continuity to the ECU. GL!

 

ECT and IAT are 2 wire sensors that use a pull-up resistor in the ECU on one wire, and are tied to ground on the other side. That internal pull-up is tied to 5.0 volt VREF. The TPS is a 3 wire sensor that is tied to VREF and ground. Not too familiar with the VTEC PS, so let's go to the easy one first. With the key in the "on" position, check voltage to the VREF wire on the TPS. It should be 5.0 volts (+/- 0.05 volts). If good, check continuity between the ground wire and negative battery terminal. Should be less than 5 ohms. Thirdly, check the output of the TPS as you slowly open the throttle (engine not running!!). There should be no hick-ups or stumbles.

If all this checks out OK, the ECU might be a likely culprit.

Did you go from no codes to 4 codes all at once? What's the story leading up to the post?

Mike