5101 tach learn

I am 2005 ford excursion with the 6.0 diesel in it and installed a viper 5101 and a pkall bypass module. The original install was two years ago and it all worked fine until about a month ago. I have discovered the cpu was bad and replace the cpu with an exact replacement went through the settings and now the darn thing wont learn the tach manually. I have it set for 15sec wait to start and tach mode because I had to hook up the tach wire for the old one to work. It turns over and starts but only runs for about 5 seconds then shuts off and tries to restart and then the same result.. I can't seem to program the tach manually........the steps are to start the truck, within 5 seconds hold the program button and release when light turns on. But the light never turns on.

Are you connected to the bypass module with wire to wire? or with the data to data wire?~It's me!

also, did you verify jumper setting to tach mode, and did you program menu settings to tach mode? menu 3-2 option 4?~It's me!

...also check to see if your antitheft/security light is flashing when you remote start truck... If it's flashing, bypass module is probably shutting down truck...download installation manual from www.xpresskit.com search your truck, and then download manual for PKALL. page 13 shows how to program module to your truck. If security light does not flash when remote starting, The vehicle starts, but will only run for 10 seconds. 1. Is the remote start programmed for voltage sense? If this does not work, a tach wire should be used. 2. Check shutdown diagnostics. To perform shutdown diagnostics: 1. With the ignition OFF, press and hold the Valet/Program switch. 2. Turn the ignition ON and then back OFF while holding the Valet/Program switch. 3. Release the Valet/Program switch. 4. Press and release the Valet/Program switch. The LED flashes a number of times on the control center to report the last shutdown for one minute or until the ignition is turned on, as shown in the following table: LED Flashes Shutdown Mode 1 Runtime expired 2 Over-rev shutdown 3 Low or no RPM 4 Transmitter shutdown (or optional push button) 5 (+) Brake shutdown 6 (-) Hood shutdown 7 Timer mode/Turbo mode/Manual mode error * 8 Neutral safety shutdown 9 Low battery (voltage mode) 10 ------------------------------------------------------- 11 Wait-to-start input timed out * Timer mode error: Ignition is on or shutdown input is active when activating timer mode. Turbo mode error: Turbo mode is programmed off, engine is not on or shutdown input is active. Manual mode error: MTS not enabled~It's me!

I think I forgot to switch the jumper setting for the tack threshold. Thanks for bringing that to my attention and thanks for the quick reply!!!!!