Pontiac Fiero 1988 Service Manual page 998

COOLANT FAN
L 4 V I N R
SYSTEM CHECK TABLE
ACTION
NORMAL
RESULT
With the engine cold
and idling, move the
A/C Function
Selector to NORM (if
equipped with A/C)
Coolant Fan and
Engine Blower turn
on
With Engine Coolant
below operating
temperature, move
the A/C Function
Selector to OFF
Coolant Fan and
Engine Blower turn
off
With engine warm,
run engine at a fast
idle for several
minutes
Coolant Fan and
Engine Blower turn
on before Coolant
Temperature
Indicator in the
Instrument Panel
comes on
• Refer to System Diagnosis when a result is not
normal.
L 4 V I N R
SYSTEM DIAGNOSIS
© Diagnostic steps for the symptoms listed in
the following table are listed after the table.
SYMPTOM TABLE
A: Coolant Fan does not run
B: Coolant Fan does not run with A/C on
C: Coolant Fan runs continuously
A: COOLANT FAN DOES NOT RUN
(TABLE 1)
Connect: FUSED JUMPER
At: ASSEMBLY
LINE
DIAGNOSTIC LINK
(ALDL) CONNECTOR
Condition:
• Ignition Switch: RUN
Jumper
Between
Correct Result For Diagnosis
Terminal B &
Ground
Coolant Fan
runs
Seel
• If the Coolant Fan runs, refer to Section 6E
for ECM diagnosis.
1. Go to Table 2.
A: COOLANT FAN DOES NOT RUN
(TABLE 2 )
Connect: FUSED JUMPER
At: ELECTRONIC CONTROL MODULE (ECM)
CONNECTOR (Connected)
Conditions:
• Ignition Switch: RUN
• A/C Function Selector OFF
Jumper
Between
Correct Result For Diagnosis
21
(DK GRN/
WHT) &
Ground
Coolant Fan
runs
Seel
• If the Coolant Fan runs, refer to Section 6E
for ECM diagnosis.
1. Leave fused jumper in place and go to
Table 3.
A: COOLANT FAN DOES NOT RUN
(TABLE 3)
Connect: T E S T LAMP
At: COOLANT FAN RELAY CONNECTOR
(Disconnected)
Conditions:
• Ignition Switch: RUN
• Fused jumper from Table 2 in place
Connect
Between
Correct Result For Diagnosis
D (BRN/WHT)
& Ground
Test Lamp
lights
Seel
D (BRN/WHT)
& F (DK GRN/
WHT)
Test Lamp
lights
See 2
A (RED) &
Ground
Test Lamp
lights
See
3
• If the results are correct, go to Table 4.
1. Check FAN E Fuse and BRN/WHT (250)
wire for an open.
2. Cheek DK GRN/WHT (335) wire for an
open.
3. Check Fusible Link A and RED (2) wire for
an open.
(Continued on next page)