Diagnostic Test

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

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, record all Freeze frame data.
3. With the scan tool, erase DTCs.
4. Turn the ignition off for 75 seconds.
5. Turn the ignition on, run the engine to operating temperature
  NOTE:
  It may be necessary to drive the vehicle under normal conditions to activate the SCR system.
6. With the scan tool, read DTCs.
  Did the DTC reset?
  
  Yes
  - Go To 2
  No
  - Perform to the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
CHECK FOR A DEF HEATER DTC
1. Refer to the recorded DTCs.
  Is DTC P05ED-00 active or pending?
  
  Yes
  - Perform the applicable diagnostic procedure for P05ED-00 before continuing with this Diagnostic. When P05ED-00 is repaired, P204F-00 may not return. Perform the Pre-Diagnostic Troubleshooting Procedure. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .
  No
  - Go To 3
CHECK FOR OTHER DEF PUMP DTCS
NOTE:
Verify that the DEF level in the DEF Tank is not too low before beginning this Diagnostic.
1. Refer to the recorded DTCs.
  Are there any other DEF Supply Pump DTCs or DEF Purge Pump DTCs active or pending?
  
  Yes
  - Perform the applicable diagnostic procedure(s). Refer to DIAGNOSTIC CODE INDEX .
  No
  - Go To 4
CHECK FUSE F59 FOR AN OPEN
1. Turn the ignition on.
2. Check Fuse F59-10A for an open.
  Is the Fuse open?
  
  Yes
  - Replace Fuse F59-10A. Then, refer to the Wiring Information and determine where the short circuit is that may have caused the open Fuse.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 5
INSTALL A KNOWN GOOD SCR RELAY #1
1. Turn the ignition off.
2. Remove the SCR Relay #1 (in the Auxiliary Power Distribution Center) and install a known good relay.
3. Turn the ignition on.
4. With the scan tool, erase DTCs in the PCM.
5. Turn the ignition on, run the engine to operating temperature
  NOTE:
  It may be necessary to drive the vehicle under normal conditions to activate the SCR system.
6. With the scan tool, select View DTCs.
  Did the DTC return?
  
  Yes
  - Go To 6
  No
  - Replace the SCR Relay #1 in accordance with the Service Information.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
CHECK THE DEF PUMP SUPPLY/PURGE LINES FOR LEAKS
1. Turn the ignition off.
2. Visually inspect the DEF Pump Supply/Purge lines for leaks.
  Are there any leaks present?
  
  Yes
  - Repair the DEF Pump Supply/Purge line(s) that are leaking. Then, begin this Diagnostic Tree again starting with the '1. ACTIVE DTC' Test Step.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 7
CHECK THE (F203) DEF SUPPLY VOLTAGE CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Turn the engine off.
2. Disconnect the SCR Relay #1 (in the Auxiliary Power Distribution Center).
3. Disconnect the PCM C1 harness connector.
4. Disconnect the DEF Pump C1 harness connector.
5. Apply Battery voltage to the (F203) DEF Pump Supply circuit at the SCR Relay #1 terminal.
6. Using a voltmeter, measure the voltage on the (F203) DEF Pump Supply circuit at the DEF Pump C1 harness connector.
  Does the voltage read Battery voltage (+- 1.0 volt)?
  
  Yes
  - Replace the DEF Pump in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Repair the (F203) DEF Pump Supply circuit for an open/high resistance.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .