Ford F150 Pickup. Instruction - part 54

the AFCM will default the fuel gauge message to zero and the gauge will read empty. The vehicle will continue 
to operate in the alternative fuel mode but the fuel level gauge will indicate empty. 

The fuel indication system on the CNG-equipped vehicles use an AFCM, compressed natural gas (CNG) fuel 
tank pressure sensor (FTPS), a fuel pump interceptor harness, and the gasoline fuel pump and fuel sensing 
circuitry. 

The fuel indication system on the LPG equipped vehicles use a fuel pump intercept harness, compuvalve, dash 
reset relay, liquid petroleum gas (LPG) sensor, compressed natural gas (CNG) fuel tank pressure sensor (FTPS) 
combined with the gasoline fuel pump and fuel sensing circuitry. 

INSPECTION AND VERIFICATION 

1. Verify the customer concern.  

2. Visually inspect for obvious signs of mechanical or electrical damage. 

Visual Inspection Chart 

 

2003 Ford Pickup F150 

2003 ACCESSORIES AND EQUIPMENT Instrument Cluster-Bi-Fuel - F150 Pickup

  

Fig. 2: Visually Inspection Chart 
Courtesy of FORD MOTOR CO. 

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before 

proceeding to the next step.  

 

2003 Ford Pickup F150 

2003 ACCESSORIES AND EQUIPMENT Instrument Cluster-Bi-Fuel - F150 Pickup

  

4. If the cause is not visually evident, connect the diagnostic tool to the data link connector and select the 

vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the 
vehicle: 

z

check that the program card or disk is correctly installed.  

z

check the connections to the vehicle.  

z

check the ignition switch position.  

5. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating 

instruction.  

6. Carry out the diagnostic tool data link test. If the diagnostic tool responds with: 

z

SCP+, SCP- or ISO circuit fault; all electronic control units no response/not equipped, refer to 
MODULE COMMUNICATIONS NETWORK .  

z

No response/not equipped for the instrument cluster, GO to Pinpoint Test A.  

z

No response/not equipped for the compuvalve (liquid petroleum gas [LPG] only), GO to Pinpoint 
Test C.  

z

No response/not equipped for the alternative fuel control module (AFCM) (compressed natural gas 
[CNG] only), GO to Pinpoint Test B.  

z

System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the 
continuous DTCs and carry out self-test diagnostics for the instrument cluster.  

7. If the DTCs retrieved are related to the concern, go to the Alternative Fuel Control Module (AFCM) or 

the Compuvalve Diagnostic Trouble Code (DTC) Index to continue diagnostics.  

8. If no DTCs related to the concern are retrieved, GO to Symptom Chart to continue diagnostics.  

COMPUVALVE DIAGNOSTIC TROUBLE CODE (DTC) INDEX (LPG ONLY) 

COMPUVALVE DIAGNOSTIC TROUBLE CODE (DTC) INDEX 

ALTERNATIVE FUEL CONTROL MODULE (AFCM) DIAGNOSTIC TROUBLE CODE (DTC) 
INDEX (CNG) 

ALTERNATIVE FUEL CONTROL MODULE (AFCM) DIAGNOSTIC TROUBLE CODE (DTC) 
INDEX (CNG) 

NOTE:

The compuvalve and the AFCM are the same component and may be displayed 
on the diagnostic tool as AFCM or compuvalve.

DTC

Description

Source

Action

U2015

Signal Link Fault (Non SCP)

Compuvalve

Go To PINPOINT TEST D .

NOTE:

For a complete list of compuvalve DTCs, refer to DIAGNOSTIC TROUBLE CODE 
DEFINITIONS .

DTC

Description

Source

Action

B1219

Fuel Tank Pressure Sensor Circuit Failure

AFCM

Go To PINPOINT TEST D .

B1220

Fuel Tank Pressure Sensor Circuit Open

AFCM

Go To PINPOINT TEST D .

 

2003 Ford Pickup F150 

2003 ACCESSORIES AND EQUIPMENT Instrument Cluster-Bi-Fuel - F150 Pickup

  

SYMPTOM CHART 

SYMPTOM CHART 

NOTE:

For a complete list of AFCM bi-fuel DTCs, refer to DIAGNOSTIC TROUBLE 
CODE DEFINITIONS .

Condition

Possible Sources

Action

No communication with the instrument 
cluster module

z

Central junction box (CJB) fuse
(s): 

z

2 (5A).  

z

6 (5A).  

z

30 (30A).  

z

Circuitry.  

z

Instrument cluster.  

z

Module configuration.  

Go To 

PINPOINT 

TEST A .

No communication with alternative fuel 
control module (AFCM) - compressed 
natural gas (CNG)

z

Battery junction box (BJB) fuse 
16 (15A).  

z

Circuitry.  

z

AFCM.  

z

Module configuration.  

Go To 

PINPOINT 

TEST D .

No communication with compuvalve - liquid 
petroleum gas (LPG)

z

Bi-fuel relay module fuse(s): 

z

1 (3A).  

z

2 (10A).  

z

Circuitry.  

z

Compuvalve.  

z

Module configuration.  

Go To 

PINPOINT 

TEST C .

Incorrect fuel gauge indication-in alternative 
fuel mode

z

Compuvalve (liquid petroleum 
gas [LPG] only).  

z

Alternative fuel control module 
(AFCM).  

z

Compressed natural gas (CNG) 
fuel tank pressure sensor 
(FTPS).  

Go To 

PINPOINT 

TEST D .

Incorrect fuel gauge indication-in gasoline 
mode

z

Circuitry.  

z

Fuel pump module.  

z

Instrument cluster.  

Go To 

PINPOINT 

TEST E .

Incorrect fuel gauge indication-in alternative 
fuel and gasoline mode

z

Circuitry.  

z

Instrument cluster.  

Go To 

PINPOINT 

TEST F .

 

2003 Ford Pickup F150 

2003 ACCESSORIES AND EQUIPMENT Instrument Cluster-Bi-Fuel - F150 Pickup