Pontiac Fiero 1988 Service Manual page 464

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (TBI) 6E2-A-9
DIAGNOSTIC CIRCUIT CHECK
2.5L "P" SERIES (TBI)
• IGN "ON" ENGINE "OFF".
• NOTE "SERVICE ENGINE SOON" LIGHT.
STEADY LIGHT
JUMPER ALDL TERMINAL "B" TO '
DOES SES LIGHT FLASH CODE 12
I
NO LIGHT
7TZ
FLASHING CODE 12
! SEE CHART A-1 !
CHECK FOR GROUNDED CKT451.
SEE WIRING DIAGRAM CHART A-1.
YES
NO
DOES "SCAN" DISPLAY ECM DATA?
! SEE CHART A-2 !
YES
x
DOES ENGINE START?
YES
ARE ANY CODES DISPLAYED?
YES
NO
SEE CHART A-2
1
NO
X
SEE CHART A-3
NO
KEFER TO APPLICABLE CODE CHART.
START WITH LOWEST CODE.
COMPARE "SCAN" DATA WITH TYPICAL VALUES
SHOWN ON FACING PAGE. ARE VALUES
NORMAL OR WITHIN TYPICAL RANGES?
YES
IL
REFER TO SYMPTOMS
IN SECTION "B".
NO
I I !
REFER TO INDICATED
COMPONENT(S) SYSTEM
CHECKS IN SECTION "C".
4-22-87
*7S3227-6E