Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

PCM WIRING OR CONNECTORS
1. Turn the ignition off.
2. Using the wiring diagram/schematic as a guide, inspect the wiring and each connector at the PCM.
3. Look for any chafed, pierced, pinched, or partially broken wires.
4. Look for broken, bent, pushed out or corroded terminals.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 1500 & 2500 - 3.7L, 4.7L & 5.7L - POWERTRAIN VERIFICATION TEST or 3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST .
  No
  - Go To 2.
CHECKING THE PCM GROUND CIRCUITS

Fig 1: Measuring Voltage Of The PCM Ground Circuits
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
  CAUTION:
  Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis.
2. Using a 12 volt test light connected to 12 volts, check the PCM ground circuits.
3. Wiggle test each circuit during the test to check for an intermittent open in the circuit.
  NOTE:
  The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
  
  Is the test light illuminated and bright?
  
  Yes
  - Go To 3.
  No
  - Repair the PCM ground circuit(s) for an open circuit or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 1500 & 2500 - 3.7L, 4.7L & 5.7L - POWERTRAIN VERIFICATION TEST or 3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST .
CHECKING THE PCM FUSED IGNITION CIRCUITS

Fig 2: Measuring Voltage Of The PCM Fused Ignition Circuits
Courtesy of CHRYSLER GROUP, LLC

CAUTION:
Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis.
1. Turn the ignition on.
2. Using a 12 volt test light connected to ground, check the PCM Fused Ignition circuits.
3. Check each circuit with the ignition on, engine running position, and during cranking.
4. Wiggle test each circuit during the test to check for an intermittent open in the circuit.
  NOTE:
  The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
  
  Is the test light illuminated and bright?
  
  Yes
  - Go To 4.
  No
  - Repair the open or short to ground in the PCM Fused Ignition circuits.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 1500 & 2500 - 3.7L, 4.7L & 5.7L - POWERTRAIN VERIFICATION TEST or 3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST .
CHECKING THE PCM FUSED B+ CIRCUITS

Fig 3: Checking The PCM Fused B+ Circuits
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
  CAUTION:
  Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis.
2. Using a 12 volt test light connected to Ground, check the PCM Fused B+ circuits.
3. Wiggle test each circuit during the test to check for an intermittent open in the circuit.
  NOTE:
  The test light should be illuminated and bright with the ignition on and not illuminated with the ignition off. Compare the brightness to that of a direct connection to the battery.
  
  Is the test light illuminated as described above?
  
  Yes
  - Test complete.
  No
  - Repair the open or short to ground in the PCM Fused B+ circuit(s) for as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 1500 & 2500 - 3.7L, 4.7L & 5.7L - POWERTRAIN VERIFICATION TEST or 3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST .