MX-5 Miata L4-1.8L DOHC (1996)
CAUTION:
Diagnostic procedures for lead-acid battery performance are different for those used for maintenance-free batteries (lithium hybrid batteries).
Incorrect diagnostics will result in false readings and unnecessary battery replacement is the wrong procedure is followed.
6.1
BATTERY DIAGNOSTIC PROCEDURES (Using Load Tester VAT-40 or Equivalent on Maintenance Batteries)
Diagnostic procedures used for testing lead-acid batteries provide false reading leading to unnecessary replacement if used on maintenance-free
batteries. The information is provided for diagnosing maintenance-free batteries.
6.2
BATTERY DIAGNOSTIC PROCEDURES (Using Midtronics PowerSensor Plus Tester on Lead-Acid Batteries)
1.
Connect the Midtronics PowerSensor Plus tester, if low voltage is found (less than 10.2V) charge the battery for two (2) hours and recheck. If the
voltage is greater then 10.2V, test battery condition without precharging. If low voltage is still found after a two (2) hour charge, replace the
battery according to the information in the warranty section of this bulletin.
2.
If the tester indicates that the battery is not at fault, refer the appropriate workshop manual or BETM (Body Electrical Troubleshooting Manual)
for troubleshooting and repair information.
The following are additional Midtronics PowerSensor Plus tester features:
Position "A" will test for an open circuit (bad cell or broken internal circuit). This is indicated by A "RED" LED light. If an open circuit is
indicated, replace the battery using the criteria described in the warranty section of this bulletin.
Position "B" a "green" LED indicated that the battery has at least 10.2V and can therefore be tested without pre-charging. This position required
that the CCA rating (for the specific battery type under test) be set on the Midtronics PowerSensor Plus Test dial. Refer to the
included chart in this bulletin, to determines actual CCA. The Midtronics PowerSensor Pulse Tester then determines actual CCA by
measuring the condition of the battery voltage and plate condition.
