Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

ACTIVE DTC
1. Ignition on, engine not running.
2. With the scan tool, read DTCs.
  Is this DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
CHECK FOR OTHER DTCS
1. Refer to the recorded DTCs.
  IS DTC U02A2 active or pending?
  
  Yes
  - Perform the applicable diagnostic procedure(s). Refer to DIAGNOSTIC CODE INDEX .
  No
  - Go To 3
CHECK THE CHARGING SYSTEM AND BATTERIES FOR PROPER VOLTAGE AND OPERATION
1. Check the Batteries and charging system for proper system voltage and operation.
  Is the system voltage normal?
  
  Yes
  - Go To 4
  No
  - Diagnose and repair the Batteries and charging system before continuing.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
CHECK THE DEF QUALITY SENSOR POWER AND GROUND CIRCUITS FOR PROPER OPERATION
1. Turn the ignition on, engine not running.
2. Disconnect the DEF Quality Sensor harness connector.
3. Measure the voltage across the (F343) ASD Supply circuit and the Ground circuit at the DEF Quality Sensor harness connector.
  Does the voltage read within 1.0 volt of Battery voltage?
  
  Yes
  - Replace the DEF Quality Sensor in accordance with the Service Information.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (F343) ASD SUPPLY CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
1. Leave the ignition on, engine not running.
2. Measure for voltage between ground and the (F343) ASD Supply circuit at the DEF Quality Sensor harness connector.
  Does the voltage read within 1.0 volt of Battery voltage?
  
  Yes
  - Repair the Ground circuit for an open/high resistance.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Repair the (F343) ASD Supply circuit for an open or high resistance.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .