Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
1. With the scan tool, create a Vehicle Scan Report and attach it to the repair order.
2. Turn the ignition to the Lock position.
3. Try to start the engine and allow to run for 30 seconds.
4. Turn the ignition off and then back on.
5. With the scan tool, read the active DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and poor pin fit.
CHECK THE (D122) SECURITY K LINE COMMUNICATION CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Keyless Ignition Node harness connector.
3. Measure the voltage between ground and the (D122) Security K Line Communication circuit.
  Is the voltage above 12.0 volts?
  
  Yes
  - Go To 3
  No
  - Repair the (D122) Security K Line Communication circuit for an open.
CHECK THE (G20) IGNITION SWITCH SENSE CIRCUIT FOR A SHORT TO BATTERY
1. Measure the voltage between ground and the (G20) Ignition Switch Sense circuit.
  Is there any voltage present?
  
  Yes
  - Repair the (G20) Ignition Switch Sense circuit for a short to voltage.
  No
  - Go To 4
CHECK THE (G20) IGNITION SWITCH SENSE CIRCUIT FOR A SHORT TO GROUND
1. Disconnect the RF Hub harness connector
2. Check for continuity between ground and the (G20) Ignition Switch Sense circuit at the RF Hub connector.
  Is there continuity between ground and the (G20) Ignition Switch Sense circuit?
  
  Yes
  - Repair in the (G20) Ignition Switch Sense circuit for a short to ground.
  No
  - Replace the Keyless Ignition Node (KIN) in accordance with the Service Information. Refer to MODULE, KEYLESS IGNITION NODE, REMOVAL .