90-823225--1 10965E-54 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
No “Malfunction Indicator Lamp” (Marine Diagnostic Code Tool Installed)
Chart A-1 (1 of 2)
TO ECM 15A
BATTERY
FUSE
DUAL ENGINE DATA LINK
(DUAL ENGINE APPLICATION
ONLY)
451 WHT/BLK
DIAGNOSTIC TEST
TERMINAL
MALFUNCTION IN-
DICATOR LAMP
MALFUNCTION INDICATOR
LAMP
DLC
MASTER/SLAVE
A
C
B
J1-5
ECM, INJECTOR KNOCK
SENSOR MODULE
10 AMP FUSE
ECM/DLC
15AMP FUSE
916 YEL
461 ORN/BLK
CIRCUIT DESCRIPTION:
There should always be a steady “Malfunction Indi-
cator Lamp” when the ignition is ON and engine
stopped. Ignition voltage is supplied directly to the
light bulb. The Electronic Control Module (ECM) will
control the light and turn it ON by providing a ground
path through CKT 419 to the ECM.
TEST DESCRIPTION:
Number(s) below refer to circled number(s) on the
diagnostic chart.
1. This step insures that battery voltage is available
to terminal “F” of the DLC connector.
2. This step checks for ground present in DLC con-
nector terminal “E.” This indicates that the ECM
is capable of completing the ground to the “Mal-
function Indicator Lamp”.
3. This step isolates the cause of incomplete
ground to either a wiring or ECM circuitry.
4. If the engine fails to crank, this may indicate a fail-
ure in the starting system circuit.
DIAGNOSTIC AIDS:
Engine runs OK, check:
• Faulty light bulb.
• CKT 419 open.
Engine cranks but will not run, check:
• Continuous battery - 50 amp circuit breaker
open.
• Open ECM fuse.
• Battery circuit to ECM open.
• Ignition circuit to ECM open.
• Poor connection to ECM.
• Faulty ECM ground circuit(s).
Engine will not crank.
• Perform EFI system relay check.
To Next Page
Loading...
