Reply #9: My two cents [View All]

[IDemo]

Take vehicles with reported pedal trouble (per the customer) and remove the pedal and wiring from the picture. Using a programmable dual DC power supply, replicate the signal outputs seen at the bottom of the datasheet for the CTS pedal. As seen in the datasheet, there are dual signals, one signal maintaining ½ the voltage level of the other at any given pedal position.

First, connect the 6-pin AMP connector from the signal cable directly to a mating connector on the power supply unit. Vary the DC outputs to emulate the pedal outputs during normal driving (in the garage, not on the road!). If the over-acceleration disappears, the pedal is at fault. If it still occurs, bypass the throttle signal cable and connect the power supply directly to the connector on the ECS input. Apply voltages within the correct operating range as above. If the problem goes away, the cable is at fault; otherwise, there is an issue with the computer hardware or firmware.

This is assuming that the bug isn't so intermittent that it won't reveal itself under a reasonable amount of test time, of course.

http://www.ctscorp.com/automotive/datasheets/703.pdf