For some reason, your code definition isn't matching up with mine. (I get mine from AllData, which is what 99% of all shops use to get their service data) Also, a stuck intake control valve wouldn't prevent your engine from starting, but you'll definitely see a performance decrease.
When I research code: P1518, it tell me the following:
The throttle actuator control (TAC) module and the powertrain control module (PCM) communicate via a dedicated serial data circuit. This serial data circuit is separate from any other serial data circuit on the vehicle. Accurate transmitting and receiving of serial data requires not only good circuit integrity but also adequate system voltage. This diagnostic monitors the accuracy of the serial data transmitted between the TAC module and the PCM. If the PCM of the TAC module detects a loss of data or invalid data, this DTC sets.
The service procedure calls for ignoring this code if your bat voltage is low. If your bat voltage is fine, then I suggest checking this circuit for a bad connector/wire or any sensors related to this circuit.
Also, treat your "no start" like any other. Begin with checking for spark, then fuel (pressure and working injectors), computer & sensors, and finally compression.
Isolate the faulty system and find the bad component and replace it. (Remember to re-test after every component replacement)
Thursday, March 18th, 2010 AT 9:59 PM