Checking Powertrain Control Module Power & Ground Circuits (3.9L & 5.9L)

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

Possible Causes

(A14) PCM Fused B+ Circuit
(F18) PCM Fused Ignition Switch Output Circuit
PCM Ground Circuits

Test Procedure

Turn the ignition off. Disconnect the Powertrain Control Module (PCM) harness connectors. See Figure . Using a 12-volt test light connected to ground, probe the (A14) fused B+ circuit in the PCM C1 harness connector. See Figure . Does the test light illuminate brightly? If yes, go to next step. If no, repair the (A14) fused B+ circuit for an open.
Turn the ignition on, with the engine off. Using 12-volt test light connected to ground, probe the (F18) PCM fused ignition switch output circuit in the PCM C1 harness connector. See Figure . Does the test light illuminate brightly? If yes, go to next step. If no, repair the (F18) PCM fused ignition switch output circuit for an open.
Turn the ignition off. Using 12-volt test light connected to battery voltage, probe the (Z12) PCM ground circuits in the PCM C1 harness connector. See Figure . Does the test light illuminate brightly? If yes, the test is complete. If no, repair the (Z12) PCM ground circuit(s) for an open.