Circuit/System Testing
- Ignition ON, observe the scan tool fuel pump control module fuel line pressure sensor parameter. Command an increase in the fuel line pressure with a scan tool. Verify the fuel line pressure increases to greater than 414 kPa (60 psi) as commanded.
- If the less than the specified range, refer to Fuel System Diagnosis .
- Remove the G18 high pressure fuel pump and visually inspect the lobes on the camshaft for unusual wear.
- If the lobes appear normal, replace the G18 high pressure fuel pump.
- If the lobes are worn, replace the camshaft.
NOTE:
Circuit/System Verification must be performed first or misdiagnosis may result.
NOTE:
As little as 2 Ω on either circuit of the high pressure fuel pump actuator will cause these DTCs to set. Test the circuits of the high pressure fuel pump actuator for a high resistance if you suspect a condition.