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 889 (ANTI-LOCK BRAKE SYSTEM CONTROL)DIAGNOSIS AND TESTINGPRINCIPLES OF OPERATIONSYMPTOM 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
No communication with the anti-lock brake system (ABS) module	Circuitry ABS module	GO to PINPOINT TEST A .
The red brake warning indicator stays on when the ignition switch is in the RUN position	Circuitry Instrument cluster Brake fluid level sensor Anti-lock brake system (ABS) module.	REFER to INSTRUMENT CLUSTER .
The yellow anti-lock brake system (ABS) warning indicator does not self-check	Circuitry Instrument cluster ABS module	REFER to INSTRUMENT CLUSTER .
Spongy brake pedal with no warning indicator	Air in brake hydraulic system	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
The stability assist system cannot be disabled	Circuitry Stability traction control switch Anti-lock brake system (ABS) module	GO to PINPOINT TEST O .
The stability assist switch indicator is never/always on	Circuitry Stability traction control switch Anti-lock brake system (ABS) module	GO to PINPOINT TEST Q .
Advance Trac® indicator always on	Fuse Circuitry	CHECK for DTCs. CLEAR DTCs. REPEAT the self-test. If DTC U1900 is present and the 4x4 low indicator is illuminated, VERIFY that battery junction box (BJB) fuse 18 (20A) is OK. If OK, REFER to MODULE COMMUNICATIONS NETWORK for communication concern.

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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.