Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSFORD2004ECONOLINE E150, VAN CARGO, 4.6 WREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 886 (MODULE COMMUNICATIONS NETWORK)DIAGNOSIS AND TESTINGCOMMUNICATIONS NETWORKSYMPTOM CHART

2004 Ford Econoline E150, Van Cargo, 4.6 W

Symptom Chart

2004 Ford Econoline E150, Van Cargo, 4.6 WSECTION Symptom Chart

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
The vehicle security module does not respond to the diagnostic tool	Circuit or connection in universal asynchronous receiver-transmitter (UART)-based protocol (UBP) communications network Battery junction box (BJB) fuse(s): 2 (30A) 29 (60A) Central junction box (CJB) fuse 20 (5A) Circuitry Vehicle security module	GO to PINPOINT TEST A .
The driver seat module (DSM) does not respond to the diagnostic tool	Circuit or connection in universal asynchronous receiver-transmitter (UART)-based protocol (UBP) communications network. Central junction box (CJB) fuse(s): 1 (30A) 20 (5A) Circuitry DSM	GO to PINPOINT TEST B .
The restraints control module (RCM) does not respond to the diagnostic tool	Circuit or connection in the international standards organization (ISO) 9141 communications network Battery junction box (BJB) fuse 15 (15A) Central junction box (CJB) fuse 19 (10A) RCM	GO to PINPOINT TEST C .
The tire pressure monitoring system module does not respond to the diagnostic tool	Circuit or connection in the controller area network (CAN) Central junction box (CJB) fuse(s): 16 (5A) 25 (5A) Tire pressure monitoring system module	GO to PINPOINT TEST D .
The anti-lock brake system (ABS) module does not respond to the diagnostic tool	Circuit or connection in the controller area network (CAN) Battery junction box (BJB) fuse(s): 5 (40A) 10 (30A) Central junction box (CJB) fuse 22 (10A) ABS Module	GO to PINPOINT TEST E .
The parking aid module does not respond to the diagnostic tool	Circuit or connection in the international standards organization (ISO) 9141 communications network Central junction box (CJB) fuse 26 (7.5A) Parking aid module	GO to PINPOINT TEST F .
The powertrain control module (PCM) does not respond to the diagnostic tool	Circuit or connection in the controller area network (CAN) Battery junction box (BJB) fuse(s): 15 (15A) 18 (20A) PCM	GO to PINPOINT TEST G .
The four-wheel drive (4WD) control module does not respond to the diagnostic tool	Circuit or connection in the controller area network (CAN) Battery junction box (BJB) fuse(s): 15 (15A) 18 (20A) PCM	GO to PINPOINT TEST G .
The instrument cluster does not respond to the diagnostic tool	Circuit or connection in the controller area network (CAN) Central junction box (CJB) fuse(s): 15 (5A) 21 (5 A) Battery junction box (BJB) fuse 15 (15A) Instrument cluster	GO to PINPOINT TEST H .
The electronic automatic temperature control (EATC) module does not respond to the diagnostic tool	Circuit or connection in the controller area network (CAN). Battery junction box (BJB) fuse 15 (15A) Central junction box (CJB) fuse 30 (5A) EATC module	GO to PINPOINT TEST I .
No controller area network (CAN) communication	Circuit or connection in the CAN CAN module powertrain control module (PCM) instrument cluster tire pressure monitoring system module electronic automatic temperature control (EATC) module anti-lock brake system (ABS) module	GO to PINPOINT TEST J .
No international standards organization (ISO) 9141 communications network communication	Circuit or connection in the ISO 9141 communications network ISO 9141 communications networked modules restraints control module (RCM) parking aid module	GO to PINPOINT TEST K .
No universal asynchronous receiver-transmitter (UART)-based protocol (UBP) communications network communication	Circuit or connection in the UBP communications network UBP communications networked modules instrument cluster vehicle security module driver seat module (DSM)	GO to PINPOINT TEST L .
No module/network communication - no voltage to the diagnostic tool	Data link connector (DLC) Central junction box (CJB) fuse 24 (15A) Circuitry Diagnostic tool	GO to PINPOINT TEST M .

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.