Pontiac Fiero 1988 Service Manual page 590

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (PORT) 6E3-A-7
DIAGNOSTIC CIRCUIT CHECK
2.8L "P" SERIES (PORT)
• IGN "ON" ENGINE "OFF".
» NOTE "SERVICE ENGINE SOON" LIGHT.
STEADY LIGHT
JUMPER ALDL TERMINAL "B" TO '
DOES SES LIGHT FLASH CODE 12.
::o LIGHT
i SEE CHART A-1
FLASHING CODE 12
I
CHECK FOR GROUNDED CKT 451.
SEE WIRING DIAGRAM CHART A-1.
YES
DOES "SCAN" DISPLAY ECM DATA 7
NO
nr.......
: SEE CHART A-2
YES
DOES ENGINE START?
YES
X
ARE ANY CODES DISPLAYED?
NO
SEE CHART A-2
l
NO
I SEE CHART A-3
]
YES
REFER TO APPLICABLE CODE CHART.
START WITH LOWEST CODE.
NO
COMPARE "SCAN" DATA WITH TYPICAL VALUES
SHOWN ON FACING PAGE. ARE VALUES
NORMAL OR WITHIN TYPICAL RANGES?
YES
3 _
REFER TO SYMPTOMS
IN SECTION "B".
NO
• _
REFER TO INDICATED
COMPONENT(S) SYSTEM
CHECKS IN SECTION "C".
4-22-87
* 7S3227-6E