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 MANUALSMERCURY2010MOUNTAINEER 2WD V8-4.6LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSTESTING AND INSPECTIONPINPOINT TESTSPINPOINT TEST V: NO POWER TO THE SCAN TOOL
2010 Mercury Mountaineer 2WD V8-4.6L
Pinpoint Test V: No Power To The Scan Tool
2010 Mercury Mountaineer 2WD V8-4.6LSECTION Pinpoint Test V: No Power To The Scan Tool
Communications Network
Pinpoint Tests
Pinpoint Test V: No Power To The Scan Tool
Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. Diagrams By Number
Normal Operation
The scan tool is connected to the Data Link Connector (DLC) to communicate with the High Speed Controller Area Network (HS-CAN) and the Medium Speed Controller Area Network (MS-CAN).
A loss of ground or poor ground at the DLC may result in HS-CAN or MS-CAN faults while the scan tool is connected.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- DLC
- Scan tool
PINPOINT TEST V: NO POWER TO THE SCAN TOOL
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Inspection and Verification
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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V1 CHECK THE DLC PINS FOR DAMAGE
- Disconnect the scan tool cable from the DLC.
- Inspect DLC pins 4, 5 and 16 for damage.
- Are DLC pins 4, 5 and 16 OK?
Yes
GO to V2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
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V2 CHECK THE DLC VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
- Measure the voltage between the DLC C251-16, circuit SBP04 (GN/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to V3.
No
VERIFY the Smart Junction Box (SJB) fuse 4 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. REPEAT the network test with the scan tool. Diagrams By Number
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V3 CHECK THE DLC GROUND CIRCUITS FOR AN OPEN
- Disconnect: Negative Battery Cable.
- Measure the resistance between the DLC C251-5, circuit GD138 (BK/WH), harness side and ground; and between the DLC C251-4, circuit GD138 (BK/WH), harness side and ground.
- Are the resistances less than 5 ohms?
Yes
REPAIR the scan tool. CONNECT the negative battery cable. REPEAT the network test with the scan tool.
No
REPAIR the circuit in question. CONNECT the negative battery cable. REPEAT the network test with the scan tool.
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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.