Quote:
Originally Posted by Blue Bowtie
The PCM conditions the signal from the VSS then sends a signal to the speedo, a separate signal to the cruise, and uses the VSS data to drive the transmission solenoids. If the trans is operating normally the VSS is probably working. Same with the cruise.
The speedo uses the output pulses operate the speedo display (stepper motor) and this stepper also drives the odometer wheels (the trip odometer is geared to the main odometer). The faint clicking you are hearing may be the stepper motor trying to follow the PCM signals. Either the speedo head is mechanically worn or the PCM output is weak or scrambled to the point where it won't signal the speedo correctly. However, the speedo head also uses a pulse counter/divider circuit to further condition the PCM signal and the power to drive the stepper is actually from a separate source from the PCM. The PCM only provides the low level signal.
Since you've evidently replaced the speedo head it may be time to look at the PCM wiring under the coolant recovery tank.
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thank you BB,, I will look into the PCM.. not likely to be the circuit board that the speedo head connects to?
everything else appears to be working fine on the circuit board outside of the odometer, trip and speedo.. all of them are dead still..PCM is the next thing I am taking a week away from this mess, break time, before my brain fries...