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2008 - MX-5 - Engine

BATTERY INSPECTION [LF]

WARNING:

  1. Since battery acid is toxic, be careful when handling the battery.

  2. Since battery acid is highly corrosive, be careful not to allow it to contact clothing or the vehicle.

  3. In case battery acid contacts skin, eyes, or clothing, flush it immediately with running water. Especially if the acid gets in the eyes, flush with water for more than 15 min. and get prompt medical attention.

Electrolyte specific gravity

1. Measure the electrolyte specific gravity using a hydrometer.

Battery voltage

1. Inspect the battery as follows:

Step

Inspection

Action

1

Measure the battery positive voltage.

12.4 V or more

Go to Step 3.

Less than 12.4 V

Go to the next step.

2

Quick charge for 30 min. and recheck voltage.

12.4 V or more

Go to the next step.

Less than 12.4 V

Replace the battery.

3

Using the battery load tester, apply load current (see battery load test current) and record battery voltage after 15 s. Is voltage more than specification?

Yes

Normal

No

Replace the battery.


Standard specification

Battery temp. (°C {°F})

Minimum voltage (V)

4 {39}

9.3

10 {50}

9.4

16 {61}

9.5

21 {70}

9.6


Parasitic Draw

1. Verify that the ignition is off (key has been removed) and that all doors are closed.
2. Remove the battery cover.
3. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [LF].)
4. Connect the tester between the negative battery terminal and negative battery cable, leave the battery undisturbed for 30 min., and then measure the parasitic draw.

NOTE:

CAUTION:

NOTE:

5. Inspect and repair wiring harnesses and connectors of the fuse where the current has decreased.


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