'94 GS300. I put the jumper wire to the diagnostic port and when i use the timing light I notice that the timing mark on the balancer is the same as without the jumper. There's 2 marks on the pulley, one for regular timing and one that you set with a wire jumpered in the diagnostic port. I also do the jumper wire and I don't get any blinking light to see what codes are, it just stays steady. Is there any other way to retrieve engines codes?,thanks