Guys,
My 4WD light is on and the 4WD is not working. The 4WD computer in the boot is giving code 21 throttle postion swicth as the problem. To date we have tried different throttle position switches, different 4WD computers and even different ECU's ( the signal from the throttle swicth runs through the ECU).
The voltage at the 4WD computer is 2.4 Volts should be 3.5volts using the switches earth. Using a direct earth to the car it is 4.0 volts.
At the ECU the voltage is 4.0 volts. We bypassed the wiring (both positive and earth) in the car directly from the ECU to the 4WD computer. Still had 2.5V. That was very weird.
Has anyone had this problem before. Any ideas on where to look?