Diagnostic Test

WARNING: This page is about a different car, the 2017 RAM 2500 HD. 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 check active DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE AMMONIA SENSOR TRIM RESISTOR
NOTE:
The Ammonia Sensor Module has two harness connectors. One connector is routed to the Ammonia Sensor Probe (in the exhaust). The other connector is routed back to the PCM and the PDC. The harness wiring to the Probe is NOT shown in the MINI Wiring Schematic above. Follow the instructions below using

wiring color only

for identification.
1. Turn the ignition off.
2. Disconnect the (Probe-side) Ammonia Sensor harness connector from the module.
3. Measure the resistance of the Ammonia Sensor trim resistor at the Ammonia Sensor (Probe) harness connector.
  NOTE:
  Measure between terminal 2 (Yellow wire) and terminal 3 (Tan wire).
  
  Is the resistance between 500.0 Ohms and 2k Ohms?
  
  Yes
  - Replace the Ammonia Sensor Module in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace the Ammonia Sensor (Probe) in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .