If any DPFEGR PID values are not as specified, replace DPFEGR sensor. If all DPFEGR PID values are
as specified, reconnect DPFEGR sensor and go to next step.
31) Check DPFEGR Sensor Voltage While Exercising EGR Valve
Ensure DPFEGR sensor is connected. Turn ignition switch to ON position. Using scan tool, access
DPFEGR PID from PID/DATA MONITOR & RECORD menu. View DPFEGR PID and make note of
voltage. Typical DPFEGR sensor voltage (ESM system) with no EGR flow is between 0.3 and 0.6 volts.
Start engine and allow to idle. Observe DPFEGR PID at idle and compare to the key on engine off
voltage. (A higher voltage at idle could be due to a non-seating EGR valve.) Using scan tool output state
control function, apply just enough vacuum to EGR valve to open it 2-3 in. Hg (7-10 kPa) without
stalling engine and release vacuum. Repeat several times while observing DPFEGR PID. DPFEGR PID
voltage must increase as valve begins to open and return to initial value as vacuum is released. A slow to
return voltage could be an indication of a binding or slow-closing EGR valve. Service or replace EGR
valve as necessary. If DPFEGR PID quickly returns to initial voltage reading after releasing vacuum, go
to step 33).
33) Inspect EGR Vacuum Regulator Solenoid Vacuum Hose For Potential Plugging
Inspect EGR vacuum hose for possible blockage or pinching. If EGR vacuum regulator solenoid vacuum
hose is plugged, repair as necessary. If EGR vacuum regulator solenoid vacuum hose is okay, unable to
duplicate or identify fault at this time. Go to TEST Z, step 1).
50) Inspect Upstream Pressure Hose Connections
Inspect upstream hose for disconnect or poor connection. If hose is off or poorly connected, repair as
necessary. Perform DRIVE CYCLES. Ensure EGR MONITOR PROCEDURE is performed to verify
repair. If hose is off okay, go to next step.
51) Inspect Upstream Pressure Hose For Plugging
Visually inspect upstream pressure hose routing. Hose must not be pinched or have dips in it where water
could settle or freeze. Remove upstream pressure hose and carefully inspect for plugging, water or leaks.
If there is a fault detected in the hose, repair or replace upstream pressure hose as necessary. Perform
DRIVE CYCLES. Ensure EGR MONITOR PROCEDURE is performed to verify repair. If hose is okay,
NOTE:
A break in step numbering sequence occurs at this point. Procedure skips
from step 31) to step 33). No test procedures have been omitted.
NOTE:
A break in step numbering sequence occurs at this point. Procedure skips
from step 33) to step 50). No test procedures have been omitted.
NOTE:
It is essential that the DPFEGR pressure hose used is the correct repair
part and not a substitute.
NOTE:
A break in step numbering sequence occurs at this point. Procedure skips
from step 51) to step 53). No test procedures have been omitted.
2003 Ford Pickup F150
2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline