Pontiac Fiero 1988 Service Manual page 576

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (TBI) 8E2-C12-3
IF CODE 14 OR 15 IS PRESENT, SEE THAT CHART FIRST.
• IGNITION " O N " , ENGINE STOPPED.
• A/C " O F F " , IS FAN " O N " ?
NO
• GROUND DIAGNOSTIC
TERMINAL
IS FAN " O N " ?
NO
YES
DISCONNECT FAN CONTROL
RELAY.
PROBE HARNESS CONNECTOR
TERMINALS " A " AND " D " WITH
A TEST LIGHT TO GROUND.
DOES LIGHT COME " O N " FOR
BOTH TERMINALS?
NON-A/C WITH A/C
NO TROUBLE
FOUND.
SEE FACING PAGE.
© UNGROUND DIAG.
TERMINAL
• ENGINE IDLING.
• A/C " O N "
IS FAN
" O N " ?
YES
3 Z
NO
YES
DIAGNOSTIC TERMINAL STILL
GROUNDED.
PROBE HARNESS CONNECTOR
TERMINAL " F " WITH A TEST
LIGHTTO 12 VOLTS.
DOES LIGHT COME " O N " ?
REPAIR OPEN IN
CIRCUIT THAT
DID NOT LIGHT.
NO TROUBLE
FOUND.
SEE FACING PAGE.
YES
NO
CHART C-12
ENGINE COOLING FAN
2.5L "P" SERIES (TBI)
1
YES
m
• DISCONNECT FAN CONTROL RELAY.
• JUMPER HARNESS CONNECTOR
TERMINALS " D " TO " F " WITH A TEST
LIGHT.
LIGHT "ON" LIGHT " O F F "
CHECK FOR SHORT
TO GROUND IN
CKT 335. IF NOT
GROUNDED, IT IS A
F A U L T Y ECM;
FAULTY FAN
CONTROL RELAY.
NO
B A C K P R O B E E C M
CONNECTOR B24 WITH A
TEST LIGHT TO GROUND.
LIGHT " O F F " LIGHT " O N "
• JUMPER HARNESS
CONNECTOR TERMINAL'
TO " E " .
• DOES FAN RUN?
YES
H
REPLACE RELAY
CHECK:
- CKT 335 FOR OPEN
- ECM CONNECTIONS
- FAULTY ECM
NO
OPEN CKT 532
FAULTY FAN MOTOR FAULTY
GROUND CKT 150.
SEE A/C
CHART C-10
FAULTY ECM
CONNECTION
OR ECM.
4-21-87
8 S 4 3 7 0 - 6 E