Pontiac Fiero 1988 Service Manual page 608

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (PORT) 6E3-A 25
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• I G N O F F .
• C O N N E C T F U E L PRESSURE G A G E .
• DISCONNECT DISTRIBUTOR 4-WAY CONNECTOR.
• E N G I N E T E M P E R A T U R E B E L O W 35°C (95°F).
• TURN IGN. ON FOR 2 SECONDS AND NOTE GAGE.
• CRANK ENGINE FOR 2 SECONDS WHILE OBSERVING GAGE.
• IF COLD START VALVE IS FUNCTIONING PROPERLY, THE
GAGE SHOULD DROP MORE THAN (20kPa) (3psi).
CHART A-9
COLD START VALVE TEST
2.8L " P " SERIES (PORT)
OK
3 Z
3L
NOT OK
• ALLOW ENGINE TO W A R M UP ABOVE 35°C
• REPEAT TEST
• PRESSURE SHOULD NOT DROP.
NO DROP
• COLD START
CIRCUIT OK.
DROPS
Z U Z Z
DISCONNECT COLD START FUEL INJECTION
SWITCH CONNECTOR.
PROBE CIRCUIT 806 TERMINAL(PPL WIRE) WITH
A TEST LIGHT CONNECTED TO GROUND
OBSERVE LIGHT WHILE CRANKING.
DISCONNECT COLD
START FUEL
INJECTION SWITCH
REPEAT TEST
JL
LIGHT
NO LIGHT
REPEAT TEST ON CKT
832 (TAN WIRE).
REPAIR OPEN CKT 806
TO STARTER SOLENOID
NO DROP
I
DROPS
REPLACE COLD
START FUEL
INJECTION
SWITCH.
CHECK FOR SHORTTO
GND. IN CKT 832. IF
NOT SHORTED,
REPLACE COLD START
VALVE.
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LIGHT
3L
NO LIGHT
CONNECT OHMMETER
BETWEEN 832 TERMINAL
OF SWITCH AND GROUND.
CHECK RESISTANCE.
RESISTANCE
GREATER THAN
200 OHMS.
RESISTANCE
BETWEEN 20 AND
200 OHMS
DISCONNECT COLD
START V A L V E .
PROBE CKT 806 WITH
TEST LIGHT TO
GROUND.
CRANK ENGINE.
LESS THAN
20 OHMS.
REPLACE COLD
START FUEL
INJECTION
SWITCH.
BE SURE
COOLANT TEMP.
IS BELOW 35°C. IF
BELOW 35°C,
REPLACE
THERMAL TIME
SWITCH.
REPLi CE
VALVE.
LIGHT
ZZEZ
1_
NO LIGHT
CHECK FOR OPEN IN
CKT 832 BETWEEN
VALVE AND COLD
START FUEL INJECTION
SWITCH.
REPAIR OPEN
CKT 806.
OPEN CKT NOT AN OPEN CKT
REPAIR WIRE
I
CHECK VALVE
CONNECTIONS. IF
OK, REPLACE COLD
START VALVE.
12-09-85
* 5 S 1789-6E