Pre-Diagnostic Troubleshooting Procedure

PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE - 6.7L

For a complete wiring diagram, refer to the Wiring Information.

1. NO RESPONSE
1. Make sure the scan tool will communicate with the appropriate modules.

Are you currently experiencing a NO RESPONSE condition?

Yes

- The NO RESPONSE condition must be properly diagnosed before continuing.
- Perform the appropriate BUS Communication test in ELECTRICAL DIAGNOSTICS. Testing and Inspection.

No

- Go To 2

2. DTC PRESENT

NOTE: Before continuing, complete the 6.7L Cummins Turbo Diesel Diagnostic Worksheet. Go to the TechConnect > submit the vehicle's VIN number > Search Tab > and Select Create Diagnostic Worksheet.

1. Turn the ignition on.
2. With the scan tool, view PCM for DTCs.

Is there a DTC present?

Yes

- Proceed to the MIL LIGHT ON PRETEST PROCEDURE. Testing and Inspection.

No

- Go To 3

3. CHECK FOR SYMPTOM BASED ISSUES
1. Check the vehicle for one of the following conditions:
- Engine No Start / Hard Start
- Engine Misfires / Runs Rough / Poor Performance
- Engine Noise
- Excessive Smoke (Black/Blue/White)

Do one of the following conditions exist?

Yes

- Perform the appropriate diagnostic procedure. .

No

- Verify the vehicles performance by performing the Diesel Fuel System Validation procedure. Component Tests and General Diagnostics