Engine No Start/Hard Start

ENGINE NO START/HARD START






Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. DTC/PRODUCT IMPROVEMENT
1. Check for any TSBs related to customer's complaint or DTCs present.
2. Follow appropriate guidelines in DTC troubleshooting tree or instructions in TSB.

Is vehicle repaired?

Yes

- Repair complete.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Go To 2

2. BATTERY VOLTAGE
1. Check for low battery voltage.

Is battery voltage okay?

No

- Repair low battery voltage.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

Yes

- Go To 3

3. STARTING ACCESSORIES
1. Inspect the Ignition switch (check for proper output voltage and/or open circuit).
2. Inspect the Starter.
3. Inspect the Grid Heaters.
4. Inspect the Fuel Heater.

Is vehicle repaired?

Yes

- Repair complete.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Go To 4

4. ENGINE TIMING
1. Inspect speed indicator ring for damaged/missing teeth.
2. Inspect for dirty or damaged pins at Crankshaft position sensor (CKP) or Camshaft position sensor (CMP).
3. Verify proper overhead adjustments.

Is vehicle repaired?

Yes

- Repair complete.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Go To 5

5. FUEL SUPPLY SYSTEM
1. Verify proper fuel quality, grade and level in vehicle.
2. Use scan tool to monitor fuel rail pressure. If pressure does not fluctuate more then +/- 500 psi of set point than the fuel system is not the cause of the complaint. Proceed to step 6. If condition exist continue.
3. Verify proper fuel system operation by performing the CHECKING THE FUEL DELIVERY SYSTEM diagnostic procedure. Checking the Fuel Delivery System.

Is vehicle repaired?

Yes

- Repair complete.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Go To 6

6. FUEL RETURN
1. Check for kinked or restricted fuel return lines.
2. Check fuel tank venting.

Is vehicle repaired?

Yes

- Repair complete.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Go To 7

7. INTAKE SYSTEM
1. Check for inlet restriction, inspect air filter for excessive dirt/debris. Verify air intake lines are not kinked or restricted.
2. Check for air system leaks. Perform INTAKE AIR SYSTEM PRESSURE TEST diagnostic procedure. Intake Air System Pressure Test.
3. Inspect Turbocharger for wheel clearance and proper wastegate operation.
4. Check for exhaust restriction. Verify proper exhaust brake operation. Check for kinked or blocked exhaust pipes.
5. Check for proper operation of EGR Airflow Throttle Control Valve.

Is vehicle repaired?

Yes

- Repair complete.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Go To 8

8. OTHER VEHICLE SYSTEMS
1. Verify proper operation of the Transmission Clutch.
2. Verify proper operation of the Transmission.
3. Verify proper operation of the Vehicle brakes (check for dragging).
4. Verify proper operation of the Cooling fan operation cycle time.
5. Verify proper operation of the Engine driven accessories.
6. Verify proper operation of the Accelerator pedal (restricted or out of calibration).
7. Verify no excess Electrical Noise.
8. Verify no Moisture in harness connector or corroded terminals.

Is vehicle repaired?

Yes

- Repair complete.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Go To 9

9. BASE ENGINE
1. Inspect speed indicator ring for damaged/missing teeth.
2. Check for internal engine damage.

Repair Complete.

Repair

- Repair complete.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.