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.

ACTIVE DTC
1. Start the engine and allow the DOC/DPF Catalyst intake temperature to reach 150°C (302°F).
  NOTE:
  This can be determined by reading the temperature of the Exhaust Gas Temperature Sensor 4 with the scan tool.
2. With the scan tool check active DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION - 6.7L diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
CHECK THE NOx SENSOR 1/2 POWER AND GROUND CIRCUITS
1. Turn the ignition on, engine not running.
2. Disconnect the NOx Sensor Module 1/2 harness connector.
3. Measure the voltage across the (F204) SCR Relay circuit and the (Z915) Ground circuit at the NOx Sensor Module 1/2 harness connector.
  NOTE:
  Measure the voltage at key on, engine cranking, and at idle.
  
  Does the voltage read within 1.0 Volt of battery voltage?
  
  Yes
  - Replace the NOx Sensor 1/2 in accordance with the service information. Refer to SENSOR, NOX, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 3
CHECK FOR VOLTAGE AT THE ((F204) SCR RELAY CIRCUIT
1. Measure the voltage between ground and the (F204) SCR Relay circuit at the NOx Sensor Module 1/2 harness connector.
  Does the voltage read within 1.0 Volt of battery voltage?
  
  Yes
  - Repair the (Z915) Ground circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Repair the (F204) SCR Relay circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .