Pontiac Fiero 1988 Service Manual page 993

S T A R T E R AND C H A R G I N G S Y S T E M
V6 VIN 9 A N D L 4 V I N R
A : C H A R G E I N D I C A T O R D O E S NOT
L I G H T W I T H IGNITION S W I T C H IN
RUN A N D ENGINE S T O P P E D «L4
VIN
R O N L Y )
Connect: FUSED JUMPER
At: GENERATOR CONNECTOR
(Disconnected)
Condition:
® Ignition Switch: RUN
Connect
Between
L (BRN) &
Ground
Correct
Result
Charge
Indicator lights
For
Diagnosis
See 1
• If result is correct, repair/replace Generator.
Refer to section 6D.
1. Check/repair GAGES
Fuse,
Indicator bulb,
PNK/BLK
(39),
BRN (25)
wires and
Instru-
ment Cluster Printed Circuit for opens (see
schematic).
B: C H A R G E I N D I C A T O R S T A Y S ON
W H E N T H E ENGINE I S RUNNING (L4
VIN R ONLY)
Disconnect: CONNECTOR
A t : GENERATOR
Condition:
• Ignition Switch: RUN
Disconnect Correct Result For Diagnosis
Generator
connector
Charge
Indicator does
not light
S e e l
• If result is correct, repair/replace Gener-
ator. Refer to Section 6D.
1. Check/repair BRN (25) wire and Instru-
ment Cluster Printed Circuit for shorts to
ground (see schematic).
C : BATTERY IS UNDERCHARGED OR
O V E R C H A R G E D (TABLE 1)
Measure: VOLTAGE
A t : GENERATOR CONNECTOR
(Disconnected) and GENERATOR
BATTERY TERMINAL
Condition:
• Ignition Switch: RUN
Measure
Between
L (BRN) (L4
VINR)&
Ground
F (BRN//WHT)
& Ground
S
(RED) &
Ground
Battery
terminal &
Ground
Correct
Voltage
Battery
Battery
Battery
Battery
For
Diagnosis
S e e l
See
2
See 3
See 3
• If all voltages are correct, reconnect con-
nector and go to Table 2.
1. Check/repair GAGES Fuse, Indicator
bulb,
PNK/BLK
(39),
BRN (25) wires
and
the Instrument Cluster Printed Circuit
for opens (see schematic).
2. Check/repair the BRN and BRN/WHT
(250) wires and FAN E Fuse for an open
(see schematic).
3. Check/repair RED and RED/BLK (2) wire
and Fusible Link E for an open (see sche-
matic).
4. Check/repair RED (2) wire for an open.
C: BATTERY IS UNDERCHARGED OR
OVERCHARGED (TABLE 2)
Measure: VOLTAGE
A t : GENERATOR
Conditions:
• All accessories turned off
• Engine running at fast
idle
Measure
Correct For
Between Voltage Diagnosis
Battery
Less than 16
See 1
terminal & volts
See 1
Ground
• If voltage is correct, perform a Generator
Load Test. Refer to Section 6D. If Gener-
ator is good, perform a Battery Load Test.
Refer to Section 6D.
1. Repair/replace Generator. Refer to Sec-
tion 6D.