z
Faulty PCM
Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Disconnect CV
solenoid connector. Connect a test light between CV and VPWR circuits at CV solenoid harness
connector. See Fig. 270. Turn ignition switch to ON position. Using scan tool, access OUTPUT TEST
MODE. See OUTPUT TEST MODE under ADDITIONAL SYSTEM FUNCTIONS. Using scan tool
commands, attempt to open and close CV solenoid driver. Select ALL OFF mode. Observe test light
while cycling START button ON and OFF. If test light illuminates and then go off, go to next step. If test
light is always off, go to step 67). If test light is always illuminated, go to step 70).
66) Check CV Solenoid Resistance
Turn ignition switch to OFF position. Using a DVOM, measure resistance between CV solenoid
terminals. If resistance is 48-65 ohms, fault is unable to be duplicated at this time. Go to TEST Z, step 1).
If resistance is not 48-65 ohms, replace CV solenoid. Perform EVAPORATIVE EMISSIONS
SYSTEM LEAK TEST under SYSTEM TESTS (EVAPORATIVE EMISSION) at EVAP test port to
verify leak did not occur during component replacement. Perform OBD-II DRIVE CYCLES under
DRIVE CYCLES. Ensure EVAP MONITOR PROCEDURE is performed.
67) Check For Open VPWR Circuit Between CV Solenoid & Power Relay
Using a DVOM, measure voltage between negative battery cable and VPWR circuit at CV solenoid
harness connector. See Fig. 270. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5
ohms or less, repair open in VPWR circuit.
68) Check VPWR Circuit For Open In Harness
Turn ignition switch to OFF position. Disconnect PCM connector(s). Using a DVOM, measure resistance
of VPWR circuit between CV solenoid harness connector and VPWR fuse to power relay (vehicles with
150-pin PCM), or PCM harness connector (all others). If resistance is less than 5 ohms, go to next step. If
resistance is 5 ohms or more, repair open in VPWR circuit.
69) Check CV Circuit For Open In Harness
Using a DVOM, measure resistance of CV circuit between PCM harness connector and CV solenoid
harness connector. If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair
open in CV circuit.
70) Check CV Circuit For Short To PWR GND In Harness
Turn ignition switch to OFF position. Disconnect PCM connector(s). Disconnect scan tool from DLC.
Using a DVOM, measure resistance between negative battery terminal and CV circuit at CV solenoid
harness connector. See Fig. 270. If resistance is more than 10 k/ohms, reconnect scan tool to DLC and go
to next step. If resistance is 10 k/ohms or less, repair short to PWR GND in CV circuit.
71) Check CV Circuit For Short To PWR Or Chassis Ground In Harness
2003 Ford Pickup F150
2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline