HE51 - Inspect Upstream Pressure Hose For Plugging

NOTE: It is essential that the DPFE pressure hose used is the correct service part and not a substitute.

- Visually inspect upstream pressure hose routing. Hose should not be pinched or have dips in it where water could settle or freeze.

- Carefully remove upstream pressure hose and inspect for plugging, water or leaks.

- Is there a fault detected In the hose?

YES -- SERVICE or REPLACE upstream pressure hose as necessary. Complete PCM reset to clear DTCs. Clearing Diagnostic Trouble Codes

Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes

NO -- GO to HE52. HE52 - Check Orifice Tube Assembly and DPFE Sensor