T–4
TROUBLE CHECK CHART
OUTBOARD WILL NOT SHUT OFF
OUTBOARD WILL NOT SHUT OFF
OUTBOARD STARTS AND STALLS
OBSERVATION POSSIBLE CAUSE PROCEDURE
Outboard starts and
runs, normal
performance while
running
Key switch or wire harness
ground
Check key switch and ground to key switch, refer
to SYSTEM ANALYSIS on p. 113 and
ELECTRICAL AND IGNITION on p. 135
Stop circuit wiring
Check EMM LED indicators. Check wire harness
(black/yellow) and key/stop switch(s).
EMM failure
Check EMM LED indicators and eliminate stop
circuit as possible cause. Stop wire (black/yellow)
has 4.0 VDC from EMM with key on or outboard
running.
OBSERVATION POSSIBLE CAUSE PROCEDURE
Outboard may not run
for more than a few
seconds
Faulty wiring, connections, or
grounds
Check all grounds, connections, and wiring
Incorrect, fouled, or worn spark
plugs
Replace spark plugs
Low or no alternator output
(55 V)
Check voltage on 55 V circuits, refer to SYSTEM
ANALYSIS on p. 113 and ELECTRICAL AND
IGNITION on p. 135
Capacitor or 55 V circuit wiring
Check capacitor and 55 V circuit, refer to
SYSTEM ANALYSIS on p. 113 and
ELECTRICAL AND IGNITION on p. 135
Contaminated or poor fuel
quality
Check or replace fuel supply
Low fuel pressure
Check pressure, refer to FUEL SYSTEM on
p. 173
Air in fuel system
Check for air in fuel supply manifold, refer to
FUEL SYSTEM on p. 173 (vapor separator
venting and fuel supply)
Fuel supply restricted
Check primer bulb, anti-siphon valve, and fuel
pick-up, check for fuel system air leaks
Injector electrical circuit or
control function
Check voltage at injectors, refer to SYSTEM
ANALYSIS on p. 113
Restricted or leaking fuel
injector(s)
Check injectors, refer to FUEL SYSTEM on p. 173
EMM program, timing, or
operation
Check EMM program and timing;
check injector
coefficients; and monitor injector control wires and
ignition primary outputs
Weak or erratic ignition output
Check ignition, refer to SYSTEM ANALYSIS on
p. 113 and ELECTRICAL AND IGNITION on
p. 135
Internal powerhead damage Check and repair as needed
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