99 astro van signs of bad ecu diagnostic port
U1255 Class 2 Communication Malfunction -No MIL Turns on steady after starting vehicle to let you know that there is a problem detected after starting, while the engine was running.įlashes ON and OFF, problem detected during THIS key cycle, engine won't/might not start. Turns on and doesn't turn off after bulb-check with the key in RUN. Turns off shortly(~5seconds) after bulb-check, lets you know that everything is working normally. If it doesn't come on then it's diagnostics time. Turns on when you turn the key to RUN, this bulb-check lets you know that the bulb is working. The 'SECURITY' light works to tell you what is going on with your Vehicle Theft Deterrent system, while there may be some variance over the years here is the basic rundown. If you have a faulty module, it may act faulty and not give you the expected results. Note that some of the ways that the sensor is connected to our vans varies over the years, in some cases where it's connected to the BCM(if you van has a BCM), and some cases the sensor is connected to the Passlock/EVO module. IMO the absolute best and most reliable fix is to have it turned off in the PCM/ECM itself, that way the VTD doesn't ever disable the injectors. Some have had luck simply disconnecting the sensor wiring while the engine is running normally, definitely worth a shot! I would rather spend $5-40 at a local JY and test yourself or have it disabled in the PCM. Have seen some overpriced 'refurbished' modules listed as well, probably just plug them into a factory system to see if they work and sell them that way. There are some bypasses available(some border on insane with their pricing) or you can buy a replacement module(junkyard/online) if yours is bad.
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Issues can be a damaged/failing sensor, module failure, key, wiring, etc. There are also some common faults on these systems that can prevent you from starting your own vehicle. This happens when the wrong key is used or the ignition lock cyl has been tampered with. Passlock/Vehicle Theft Deterrent(VTD) disables the fuel injectors, stopping the vehicle from starting.