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

Possible Causes

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

Test Procedure

1. Turn the ignition off. Disconnect the Powertrain Control Module (PCM) harness connectors. See Fig 4 . Using a 12-volt test light connected to ground, probe the (A14) fused B+ circuit in the PCM C1 harness connector. See Fig 5 . Does the test light illuminate brightly? If yes, go to next step. If no, repair the (A14) fused B+ circuit for an open.
2. 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 Fig 5 . 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.
3. Turn the ignition off. Using 12-volt test light connected to battery voltage, probe the (Z12) PCM C1 ground circuits in the PCM harness connector. See Fig 5 . Does the test light illuminate brightly? If yes, the test is complete. If no, repair the (Z12) PCM ground circuit(s) for an open.

Fig 1: Locating Powertrain Control Module (4.7L)

Courtesy of CHRYSLER CORP.

Fig 2: Identifying Powertrain Control Module C1 Harness Connector Terminals (4.7L)

Courtesy of CHRYSLER CORP.

Fig 3: Identifying Powertrain Control Module C4 Harness Connector Terminals (4.7L)

Courtesy of CHRYSLER CORP.

Fig 4: Locating Powertrain Control Module & Harness Connectors (5.9L)

Courtesy of DAIMLERCHRYSLER

Fig 5: Identifying Powertrain Control Module C1 Harness Connector Terminals (5.9L)

Courtesy of CHRYSLER CORP.