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.
Diagnosis And Testing: Battery
| Diagnostic Battery Charger |
- Use Ford approved battery test equipment.
- Midtronics MDX-650 or P-300/P-600/490/1050
- Midtronics GRX-3590 or 3000
- Midtronics EXP-890
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .
PINPOINT TEST A: BATTERY CONDITION TEST
- Normal Operation and Fault Conditions
Battery condition is determined by measuring battery terminal voltage after a specific discharge current is applied for a specified time period.
Possible Sources
- Battery
- Wiring, terminals or connectors
Visual Inspection and Pre-checks
- Inspect wiring, terminals and connectors.
- Inspect the battery.
- Inspect battery mounting
- Inspect high current BJB connections.
- A1 TEST THE BATTERY CONDITIONNOTE: Failure to fully charge the battery before retesting may cause false readings.
- Using the Diagnostic Battery Charger and the battery cables removed from the battery, verify the battery condition.
Is the battery OK?
Yes RETURN the battery to service. No If the analyzer reads REPLACE BATTERY or REPLACE-BAD CELL, INSTALL a new battery. REFER to: Battery
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.