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. Turn the ignition on.
2. With the scan tool, View DTCs.
  Is the DTC active?
  
  Yes
  - Go To 3.
  No
  - Go To 2.
CHECK THE NOx 1/1 SENSOR INTERNAL HEATER
1. Start the engine and allow it to idle for at least two minutes.
2. With the scan tool, View DTCs.
  Is the DTC active?
  
  Yes
  - The NOx Sensor 1/1 internal heater has malfunctioned. Replace the NOx Sensor 1/1 in accordance with the service information. Refer to SENSOR, NOx , Removal .
  No
  - Go To 3.
CHECK THE NOx SENSOR 1/1 POWER AND GROUND CIRCUITS
1. Turn the ignition on, engine not running.
2. Disconnect the NOx Sensor Module 1/1 harness connector.
3. Measure the voltage across the (F505) Fused Ignition Switch Output circuit and the (Z915) Ground circuit at the NOx Sensor Module 1/1 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 1/1 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 4.
CHECK FOR VOLTAGE AT THE (F505) FUSED IGNITION SWITCH OUTPUT CIRCUIT
1. Measure voltage between ground and the (F505) Fused Ignition Switch Output circuit of the NOx Sensor Module 1/1 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 (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 .