Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. 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 (F505) Fused Ignition Switch Output circuit and the (Z914) 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 (F505) FUSED IGNITION SWITCH OUTPUT CIRCUIT
1. Measure the voltage between ground and the (F505) Fused Ignition Switch Output circuit at the NOx Sensor Module 1/2 harness connector.
  Does the voltage read within 1.0 Volt of battery voltage?
  
  Yes
  - Repair the (Z914) 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 (F505) Fused Ignition Switch Output circuit for an open or high resistance. If the fuse is found to be open, check the circuit for a short to the (Z915) Ground circuit or a short to chassis ground.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .