Repairing Manual A/C System Communication Failure

WARNING: This page is about a different car, the 1994 Eagle Vision, 1994 Dodge Intrepid, 1994 Chrysler New Yorker, 1994 Chrysler LHS, and 1994 Chrysler Concorde. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Any engine faults present may affect operation of A/C system.

Using DRB, perform ENGINE CONTROLLER SYSTEM test. If DRB displays ENGINE CONTROLLER: ACTIVE ON THE BUS, go to next step. If DRB does not display ENGINE CONTROLLER: ACTIVE ON THE BUS, go to step 3).
Using DRB, read POWERTRAIN CONTROL MODULE (ENGINE) trouble codes. If DRB displays A/C CLUTCH RELAY CIRCUIT or any other engine trouble codes, see appropriate G - TESTS W/ CODES article in ENGINE PERFORMANCE section. Trouble code(s) is related to PCM, A/C clutch relay, or A/C clutch coil. If DRB does not display A/C CLUTCH RELAY CIRCUIT, go to next step.
Turn ignition off. Locate PCM under air cleaner and disconnect PCM connector. Do not disconnect DRB from data link connector. Using a DVOM, measure resistance of Chrysler Collision Detection Bus (CCD Bus+) circuit (Violet/Brown wire) between PCM connector terminal No. 26 and data link connector terminal No. 4. If resistance is less than 5 ohms, go to next step. If resistance is greater than 5 ohms, repair open CCD Bus+ circuit. Perform VERIFICATION TEST .
Using a DVOM, measure resistance of Chrysler Collision Detection Bus (CCD Bus-) circuit (White/Black wire) between PCM connector terminal No. 46 and data link connector terminal No. 3. If resistance is less than 5 ohms, replace PCM. Perform VERIFICATION TEST . If resistance is greater than 5 ohms, repair open in CCD Bus- circuit. Perform VERIFICATION TEST .