Self-Diagnosis System - Mazda MX-5 1990 Workshop Manual

G
G-12
I _ .
CHARGING SYSTEM
S TERMINAL
05UOGX-023
L TERMINAL
B TERMINAL ALTERNATOR
REGULATOR
WARNING LAMP
- - - - - - l
rtO-t---->---~
-=-
I
m-'
- - - - - - - - . 1
GROUND
05UOGX-024
05UOGX-026
ALTERNATOR
Caution
• Obtain the code number and deactivate the audio
anti-theft system before disconnecting the battery.
(Refer to page T -113.)
• Be sure the battery connections are not reversed
because this will damage the rectifier.
• Do not use high-voltage testers such as a megger
because they will damage the rectifier.
• Remember that battery voltage is always applied to
the alternator B terminal.
• Do not ground the L terminal while the engine is
running.
• Do not start the engine while the connector is dis-
connected from the Land S terminals.
SELF-DIAGNOSIS SYSTEM
The alternator has a self-diagnostic function to warn of prob-
lems in the charging system.
If any of the following problems arise, the alternator warning
lamp illuminates.
1. S circuit open.
2. No voltage output.
3. Field ci rcu it open.
4. B circuit open.
5. Voltage output too high.
Removal/Installation
1. Disconnect the negative battery cable.
2. Disconnect the PIS pressure switch connector.
3. Disconnect the water thermoswitch connector.
4. Disconnect the ISC valve connector.
5. Remove the air pipe.
6. Disconnect the wire and connector from the alternator.
7. Remove the alternator bolts and nut.
8. Remove the alternator.
10. Install in the reverse order of removal.
Tightening torque
Bolt, Nut (1):
37-52 N·m (3.8-5.3 m-kg, 27-38 ft-Ib)
Bolt (2):
19-25 N·m (1.9-2.6 m-kg, 14-19 ft-Ib)
Nut (3):
9.8-15
N·m
(100-150
em-kg,
87-130 in-Ib)