Sounds like a vacuum problem. Check the "Vacuum Actuator Override" article on the Isuzu Main Page -- the steps outlined there would walk you through the troubleshooting...

Is it a fast flash or a slow flash? IIRC the slow flash was "trying to engage" whereas the fast flash indicated a problem of some kind that won't let it engage...


Chris Perosi
Isuzu Editor Emeritus
OutdoorWire, Inc.