Not much on this short lived and zero testing info.
All I got from GM is that a TECH 1 special to GM dealers can read VTCS. Found wiring for relay and solenoid may help.
Relay is either on left or right side firewall on a bracket. Has 4 wires term A pink/blk 12v
term C dkgrn/wht grounded by PCM to close relay and apply volt to VTCS
term D pink/blk 12V
Brn/wht 12v when relay is closed. This wire goes to VTCS which is grounded G117 right rear cylinder head.
Ohm checking and voltage checks will verify if relay and solenoid are operable. And no signal from PCM on C would mean? Either PCM has not reseived info or is faulty. Must be operated by MAP and VSS so if MAP is not signaling vac change in manifold in relation to TPS and vehicle speed may not operate.
That's all I could find hope it helps
Monday, December 8th, 2008 AT 3:40 PM