I am perplexed. My mechanic cannot help me with the diagnose the Abs module. Even the dealer can't! Mechanic says it's getting 5.1 volts. Needs 6. Abs sensor on diff (which I just replaced) has no voltage. Abs, air bag and brake lights are all on. No mechanic in town wants to touch this truck. And I can't pass smog til it's fixed. Also no speedo or odometer function. Help please?