GENERATOR INNER PARTS
Rotor
1. Measure the resistance between the slip rings using a tester.
If not within the specification, replace the rotor.
Generator rotor resistance (between slip rings) [20°C {68°F}]
2.0-2.3 ohm
4
value 100%?
No
PCM, generator,
or both are not
normal.
5
Monitor the ALTF PID using the M-MDS or equivalent, or calculate the
duty value of the PCM terminal 2AI using an oscilloscope. Is the duty
value 0%?
Yes
PCM input error.
No
PCM, generator,
or both are not
normal.
(1)
Headlights, blower motor, rear window defroster, and brake light.
(2)
If the generator field coil duty value does not change when electrical loads (such as headlights,
blower motor, rear window defroster, brake light) are on or off, inspection with discharged battery is
needed.
2007 Mazda MX-5 Miata Sport
2007 ELECTRICAL Charging System - MX-5 Miata
Microsoft
Thursday, July 09, 2009 3:07:38 PM
Page 12
© 2005 Mitchell Repair Information Company, LLC.