Pontiac Fiero 1988 Service Manual page 999

COOLANT FAN Jmmas^smm
L 4 V I N R
(Continued from previous page)
A: C O O L A N T FAN D O E S NOT
RUN
( T A B L E 4)
Connect: 20 AMP FUSED JUMPER
At: COOLANT FAN RELAY CONNECTOR
(Disconnected)
Jumper
Between
Correct Result For Diagnosis
A (RED) &
E
(BLK/RED)
Coolant Fan
runs
Seel
• If the Coolant Fan runs
Coolant Fan Relay.
, replace the
1. Leave fused jumper in place and go to
Table 5.
A : C O O L A N T F A N D O E S NOT R U N
( T A B L E 5)
Connect: TEST LMHP
At: COOLANT FAN MOTOR CONNECTOR
(Disconnected)
Condition:
• Fused jumper from Table 4 in place
Connect
Between
Correct Result For Diagnosis
B (BLK/RED)
& Ground
Test Lamp
lights
S e e l
B (BLK/RED)
& A (BLK)
Test Lamp
lights
See
2
• If the results are correct, replace the
Coolant Fan Motor.
1. Check BLK/RED (532) wire for an open.
2. Check BLK (151) wire for an open.
B: C O O L A N T F A N D O E S N O T R U N
WITH A / C O N
Connect: FUSED JUMPER
At: A/C CONTROL HEAD CONNECTOR
(Disconnected)
Condition:
• Ignition Switch: RUN
Jumper
Between
Correct Result For Diagnosis
K (DK GRN/
WHT) &
Ground
Coolant Fan
runs
S e e l
K (DK GRN/
WHT) & H
(BLK)
Coolant Fan
runs
See
2
• If the Coolant Fan runs, replace the A/C
Control Head.
1. Check DK GRN/WHT (335) wire for an
open (see schematic).
2. Check BLK (150) wire for an open.
C : COOLANT FAN RUNS
CONTINUOUSLY
1. With the Ignition Switch in RUN, discon-
nect the Coolant Fan Relay connector and
connect a Test Lamp between D (BRN/
WHT) and F (DK GRN/WHT).
* If the Test Lamp lights, go to step 2.
© If the Test Lamp does not light, replace the
Coolant Fan Relay.
2. Disconnect the A/C Control Head connector.
• If the Coolant Fan runs, go to step 3.
© If the Coolant Fan does not run, replace the
A/C Control Head.
3. Disconnect the Electronic Control Module
(ECM) connector C2.
• J f the Coolant Fan runs, check DK GRN/
WHT (335) wire for short to ground.
• If the Coolant Fan does not run, refer to
Section 6E for ECM diagnosis.
V 6 VIN
9
S Y S T E M D I A G N O S I S
• Diagnostic steps for the symptoms listed in
the following table are listed after the table.
S Y M P T O M T A B L E
A: Coolant Fan does not run with engine
hot.
B: Coolant Fan does not run with A/C on
C: Coolant Fan does not run at all
D: Coolant Fan runs continuously
A: C O O L A N T FAN D O E S N O T RUN
W I T H
ENGINE
H O T
Connect: FUSED
JUMPER
At: COOLANT TEMPERATURE SWITCH
CONNECTOR (Disconnected)
Conditions:
• Ignition Switch: RUN
° A/C Function Selector: OFF
Jumper
Between
Correct Result For Diagnosis
DK GRN/
WHT&
Ground (see
schematic)
Coolant Fan
and Engine
Blower run
Seel
(Continued on next page)