Ford F150 Pickup. Instruction - part 1343

Fig. 2: Identifying Powertrain Control Module Connector Terminals (F150) 
Courtesy of FORD MOTOR CO. 

NATURAL GAS VEHICLE MODULE 

Ground Circuits 

Turn ignition off. Disconnect Natural Gas Vehicle Module (NGVM) 60-pin connector. See NGVM 
LOCATION table. Using DVOM, check continuity between chassis ground and NGVM connector terminals 
No. 40 and 60. See Fig. 3. If continuity exists, see POWER CIRCUITS. If continuity does not exist, repair 
open in affected ground circuit. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in 
ELECTRICAL. 

NGVM LOCATION 

Application

Location

Crown Victoria

Front Center Of Engine Compartment

Econoline

Left Side Of Engine Compartment, Near Battery Junction Box

F150 Pickup

Front Right Side Of Engine Compartment

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE System & Component Testing - CNG

  

Fig. 3: Identifying Natural Gas Vehicle Module Circuits & Connector Terminals 
Courtesy of FORD MOTOR CO. 

Power Circuits 

Turn ignition off. Ensure NGVM 60-pin connector is disconnected. Turn ignition on. Using DVOM, check for 
battery voltage between chassis ground and NGVM connector terminals No. 1, 37 and 57 (VPWR). If battery 
voltage is not present, repair open in affected circuit as necessary. See ENGINE PERFORMANCE in 
appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. 

SENSORS & SWITCHES 

SENSORS 

Engine Fuel Temperature Sensor 

NOTE:

For gasoline-related sensor testing procedures such as; CHT, IAT, MAF 
sensors, etc., see SYSTEM & COMPONENT TESTING - GASOLINE article.

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE System & Component Testing - CNG

  

Faults in Engine Fuel Temperature (EFT) sensor or circuit should set a DTC. See QUICK TEST in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. If no DTC has been set, see TEST DB: ENGINE 
FUEL TEMPERATURE SENSOR under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL 
& GASOLINE article for EFT sensor and circuit testing. 

Fuel Rail Pressure Sensor 

Faults in Fuel Rail Pressure (FRP) sensor or circuit should set a DTC. See QUICK TEST in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. If no DTC has been set, see TEST HB: 
NATURAL GAS FUEL DELIVERY SYSTEM under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, 
FLEX-FUEL & GASOLINE article for FRP sensor and circuit testing. 

Reference Voltage 

Faults in sensor reference voltage or signal return circuits should set a Diagnostic Trouble Code (DTC). See 
QUICK TEST in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. If no DTC has been set, 
see TEST C: REFERENCE VOLTAGE under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-
FUEL & GASOLINE article for FRT reference voltage and signal return circuit testing. 

SWITCHES 

Inertia Fuel Shutoff Switch 

Ensure ignition is off. Locate Inertia Fuel Shutoff (IFS) switch, behind right kick panel (Econoline and F150), 
or on left side of trunk (Crown Victoria). Shake or jar IFS switch to cause switch to open. IFS switch reset 
button should pop up. Fuel pump should not operate and vehicle should not start. Push down on reset button. 
Restart engine. Fuel pump should operate. 

RELAYS & SOLENOIDS 

RELAYS 

Mini ISO Relay Test 

NOTE:

Engine Fuel Temperature (EFT) sensor may also be known as Fuel Rail 
Temperature (FRT) sensor.

NOTE:

Fuel Rail Pressure (FRP) sensor may also be known as Injection Control 
Pressure (ICP) sensor.

NOTE:

For additional gasoline-related switch testing procedures such as; A/C high 
pressure, BPP, O/D OFF switches, etc., see SYSTEM & COMPONENT TESTING - 
GASOLINE article.

NOTE:

Fuel pump relay may also be referred to as the fuel valve relay.

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE System & Component Testing - CNG

  

1. Remove relay. Check relay continuity. Continuity should exist between relay terminals No. 85 and 86, 

and between relay terminals No. 30 and 87a. See Fig. 4. Continuity should not exist between relay 
terminals No. 30 and 87. If continuity is as specified, go to next step. If continuity is not as specified, 
replace relay.  

2. Using a jumper wire, apply battery voltage to relay terminal No. 85. Using a second jumper wire, ground 

relay terminal No. 86. Continuity should now exist between relay terminals No. 30 and 87. If continuity is 
not as specified, replace relay. If continuity is as specified, relay is okay at this time.  

Fig. 4: Identifying Mini ISO Relay Terminals 
Courtesy of FORD MOTOR CO. 

FUEL SYSTEM SAFETY PRECAUTIONS 

NOTE:

This test applies to PCM power relay, cooling fan low relay (if equipped), A/C 
WOT cutout relay (if equipped) and fuel pump (valve) relay. For cooling fan high 
relay testing and all cooling fan circuit testing, see TEST KF: FAN CONTROL 
RELAY under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & 
GASOLINE article.

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE System & Component Testing - CNG