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 MANUALSFORD2007FUSION SEL, 2.3 Z, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 165 (MULTIFUNCTION ELECTRONIC MODULES SYSTEM)DIAGNOSIS AND TESTINGSMART JUNCTION BOX (SJB)PINPOINT TESTPINPOINT TEST A: NO COMMUNICATION WITH THE SMART JUNCTION BOX (SJB)TESTING
2007 Ford Fusion SEL, 2.3 Z, Standard
Pinpoint Test A: No Communication With The Smart Junction Box (SJB): Testing
2007 Ford Fusion SEL, 2.3 Z, StandardSECTION Testing
WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
- A1 CHECK THE SJB VOLTAGE SUPPLY CIRCUITS FOR AN OPEN
- Key in OFF position.
- Disconnect: SJB C2280a.
- Disconnect: SJB C2280g.
- Using the following table, measure the voltage between the SJB, harness side and ground:SJB CONNECTOR-PIN REFERENCE
SJB Connector-pin Circuit C2280a-29 1231 (RD/WH) C2280g-l 906 (RD/OG) C2280g-2 905 (GY/LB) - Are the voltages greater than 10 volts?
- Yes : GO to A2.
- No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
- A2 CHECK THE SJB GROUND CIRCUIT FOR AN OPEN
- Connect: SJB C2280g.
- Disconnect: SJB C2280e.
- Measure the resistance between the SJB C2280a-30, circuit 1203 (BK/LB), harness side and ground; and between the SJB C2280e-3, circuit 1205 (BK), harness side and ground.
- Are the resistances less than 5 ohms?
- Yes : REFER to MODULE COMMUNICATIONS NETWORK to continue communication diagnosis.
- No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
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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.