Pontiac Fiero 1988 Service Manual page 626

D R I V E A B I L I T Y A N D E M I S S I O N S - F U E L I N J E C T I O N ( P O R T ) 6 E 3 - A - 4 3
©
BEFORE USING THIS CHART, CHECK FOR PORTED VACUUM TO
EGR S O L E N O I D , ALSO CHECK HOSES FOR LEAKS OR
RESTRICTIONS .SHOULD BE AT LEAST 7" HG VACUUM AT 2000
RPM.
• DISCONNECT EGR SOLENOID V A C U U M HARNESS .
® ROTATE HARNESS AND REINSTALL ONLY THE EGR VALVE
S I D E .
• IGNITION " O N " , ENGINE STOPPED .
• INSTALL A HAND HELD V A C U U M PUMP WITH GAGE TO
MANIFOLD SIDE OF EGR S O L E N O I D .
© APPLY VACUUM AND OBSERVE EGR VALVE .
• VALVE SHOULD NOT MOVE .
CODE 3 2
EXHAUST GAS RECIRCULATE
(EGR) CIRCUIT
2.8L "P" SERIES (PORT)
VALVE DOES NOT MOVE
• GROUND DIAGNOSTIC
TERMINAL.
• REPEAT T E S T .
VALVE MOVES
r —
• DISCONNECT EGR SOLENOID
ELECTRICAL CONNECTOR
€ REPEAT T E S T .
VALVE MOVES
©
VALVE DOES NOT MOVE
VALVE MOVES
VALVE DOES NOT M O V E
SEE "DIAGNOSTIC
AIDS" ON FACING
PAGE.
DISCONNECT EGR
4 - W A Y
CONNECTOR.
CONNECT
VOLTMETER
BETWEEN C & D .
IGNITION " O N "
• DISCONNECT EGR 4 - W A Y
CONNECTOR
© CONNECT TEST LIGHT BETWEEN
HARNESS TERMINALS A & B .
FAULTY EGR
SOLENOID
CKT 901 SHORTED
TO GROUND OR
FAULTY ECM SEE
ECM Q U A D
DRIVER CHECK
(CHART C-1).
LIGHT " O N "
CONNECT V A C U U M PUMP
TO EGR VALVE.
APPLY V A C U U M AND
OBSERVE VALVE.
LIGHT " O F F "
CONNECT TEST LIGHT
BETWEEN TERMINAL
' A " A N D G R O U N D .
VALVE MOVES
i
FAULTY HOSE OR
CONNECTION BETWEEN
EGR SOLENOID AND EGR
VALVE OR FAULTY EGR
SOLENOID.
VALVE DOES
NOT MOVE
REPLACE
EGR VALVE.
LIGHT " O F F "
z z x z z
3 L
LIGHT " O N "
REPAIR OPEN
CKT 639
OVER 10 VOLTS
OPEN CKT 901,
FAULTY
CONNECTION OR
FAULTY ECM OR
FAULTY ECM SEE
ECM Q U A D
DRIVER CHECK
(CHART C-1).
UNDER 10 VOLTS
©
CONNECT OHMMETER ACROSS
TERMINALS C 8c D OF SOLENOID .
APPLY 24 KPa (7") V A C U U M TO
VACUUM DIAGNOSTIC SWITCH .
NOTE RESISTANCE
X
CONNECT VOLTMETER BETWEEN
TERMINAL " C " AND CHASSIS GROUND.
OVER 10 VOLTS
J L
UNDER 1 0 VOLTS
LOW RESISTANCE
(SWITCH CLOSED)
HIGH RESISTANCE
(SWITCH OPEN )
OPEN GROU8VD
C K T 4 5 0 .
PROBLEM IS
INTERMITTENT, CHECK
ALL CONNECTIONS AND
TERMINALS .
FAULTY SWITCH ,
WIRING OR
CONNECTIONS.
OPEN CKT 997,
FAULTY
CONNECTION
OR FAULTY ECM OR
FAULTY ECM SEE ECM
QUAD DRIVER CHECK
(CHART C-1).
7-1-87
* 5 S 1913-6E