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Re: 2002 Viggen codes P1312, P1334, P0340, P1230, P0455
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Posted by Bernie [Email] (#1501) [Profile/Gallery] (more from Bernie) on Tue, 29 Oct 2019 20:13:38 Share Post by Email
In Reply to: 2002 Viggen codes P1312, P1334, P0340, P1230, P0455, Glen W, Mon, 28 Oct 2019 06:22:35
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Hello,
A few things. I would check voltage on a +15 circuit when cranking. I would do this on the instrument panel fuse panel for ease. Not sure which fuses are +15 on the top of my head. One of the trionic fuses will be. Remember on T7 the computer (ecm) won't be energized if cranking drops below about 10.5 volts. This can be caused by the battery itself, battery cables (either pos or neg) and the electrical portion of the ignition switch.
If that voltage is fine. I would check voltage on the fuel pump fuse in the same fuse panel. It is not energized unless the ecm (T7) and the fuel pump relay are working. Which also tells you if the crank sensor is working.
I assume you have reset the limp home solenoid. Even if you have try working the fuel pedal a little when try to start incase it is still in limp home for some reason and needs a little more air.
One last thing I may disconnect the hose from the purge valve and block it off incase the charcoal canister is full of fuel for some reason and allowing extremely rich vapor.
Then another option would be to check and make sure all the other control modules in the car are online and communicating properly. A unrelated control module could be crashing the bus system which can cause a no start condition as well. Good Luck, Bernie
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