Engine Idle Speed Does Not Increase

Measure voltage to ground at the DK GRN/YEL wire (959) on the ECM.

Electronic Control Module Voltages:

A/C Mode Selector in MAX

^ If voltage is not present check the DK GRN/YEL wire (959) for an open between the ECM and S135.
^ If voltage is normal refer to Computers and Control Systems for ECM Diagnostics.