CHARGING SYSTEM
CHARGING SYSTEM
The charging system is an integral part of the bat-
tery and starting systems. Because all these systems
work in conjunction, diagnose and test them together.
Circuit A11 connects to the generator output termi-
nal and splices to fuse 2 and fuse 6 in the Power Dis-
tribution Center (PDC). Circuit A0 connects the
battery to the PDC.
Circuit Z0 provides ground for the generator. Cir-
cuit Z0 attaches to the right side rear of the engine.
When the ignition switch is in either the START or
RUN position, it connects circuit A1 from fuse 4 in
the PDC to circuit A21. Circuit A21 powers fuse 5 in
the fuse block. Circuit G50 from fuse 5 splices to
power the coil side of the Automatic Shut Down
(ASD) relay. The Powertrain Control Module (PCM)
provides ground for the relay on circuit K51. Circuit
K51 connects to cavity 51 of the PCM.
When the PCM grounds the ASD relay, contacts in-
side the relay close and connect circuit A14 from fuse
1 in the PDC to circuit A142. Circuit A142 splices to
the generator field terminal.
The PCM has an internal voltage regulator that
controls generator output. The PCM controls the gen-
erator field on circuit K20. Circuit K20 connects to
PCM cavity 20.When the engine operates and there is current in
the generator field, the generator produces a B+ volt-
age. The generator supplies B+ voltage to the battery
through the A11 and A0 circuits.
HELPFUL INFORMATION
²The ignition switch also connects circuit A1 with
circuits A41, A22, and A31.
²Circuit A21 also powers fuse 9 in the fuse block.
²Circuit G50 also powers the coil sides of the fuel
pump relay and the torque convertor clutch (TCC) re-
lay.
²The ASD relay supplies battery voltage for the fuel
injectors, ignition coil, and the heated oxygen sensor.
²Circuit K51 also provides ground for the coil side
of the fuel pump relay.
DIAGRAM INDEX
Component Page
Battery...............................8W-20-2
Fuse 2 (PDC)...........................8W-20-2
Fuse 6 (PDC)...........................8W-20-2
Generator..............................8W-20-2
Powertrain Control Module (PCM)..............8W-20-2
J8W-20 CHARGING SYSTEMÐYJ VEHICLES 8W - 20 - 1
TRANSMISSION CONTROLS
TORQUE CONVERTER CLUTCH (TCC) SOLENOID
AND RELAY
The TCC solenoid is only used on three-speed au-
tomatic transmissions. The Powertrain Control Mod-
ule (PCM) operates the TCC solenoid by energizing
the TCC relay.
Circuit G50 from fuse 5 in the Power Distribution
Center (PDC) supplies voltage to the coil side of the
TCC relay. When the PCM provides a ground path on
circuit K54, the relay contacts close.
When the relay contacts close, they connect circuit
A14 from fuse 1 in the PDC with circuit T22. Circuit
T22 supplies battery voltage to the case grounded
TCC solenoid. Circuit K54 connects to PCM cavity
54.
HELPFUL INFORMATION
²In the RUN or START position, the ignition switch
connects circuit A1 from fuse 4 in the PDC to circuit
A21.
²Circuit A21 powers fuse 5 in the fuse block.
²Circuit G50 also connects to the engine data link
connector, Automatic Shut Down (ASD) relay, and
fuel pump relay.
UPSHIFT LAMP
On vehicles equipped with a manual transmission,
the PCM grounds the up-shift lamp on circuit K54.
Circuit K54 connects to cavity 54 of the PCM.
DIAGRAM INDEX
Component Page
Fuse 1 (PDC)...........................8W-31-2
Fuse 4 (PDC)...........................8W-31-2
Fuse 5 (Fuse Block).......................8W-31-2
Ignition Switch..........................8W-31-2
Instrument Cluster........................8W-31-2
Powertrain Control Module (PCM)..............8W-31-2
TCC Relay.............................8W-31-2
TCC Solenoid...........................8W-31-2
J8W-31 TRANSMISSION CONTROLSÐYJ VEHICLES 8W - 31 - 1
