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ENGINE MANAGEMENT MODULE (EMM)
EMM DIAGNOSTICS
EMM DIAGNOSTICS
LED Indicators
The EMM has LED indicators located next to the
electrical connectors that provide information
related to various electrical circuits.
IMPORTANT: LED 1 is toward the rear of the
outboard (Closest to EMM J2 connector).
Starting Mode
“Starting mode” occurs from EMM power ON until
outboard is running for 2 seconds.
LED 1 – Stator signal 30 V or higher, “CHARG-
ING OKAY.” For NO LIGHT, investigate S.A.C.
circuit operation.
LED 2 – Crankshaft position sensor output, EMM
powered (ON), “CRANK POSITION OKAY.” For
NO LIGHT, investigate possible fault code 16.
LED 3 – Sensor circuits (5 V), “SENSORS
OKAY.” For NO LIGHT, investigate possible fault
codes: 12, 13, 24, 16, 41, 42, 44, 45, 46, 47, 48,
49, 67, 68, 69.
For FLASHING LIGHT ON, investigate code 57
(High RPM with low TPS setting)
LED 4 – Lanyard/Stop circuit not grounded, “LAN-
YARD/STOP OKAY.”
For NO LIGHT, repair grounded stop circuit.
For FLASHING LIGHT ON, investigate possible
fault code 29 (engine shutdown, EMM overheat),
code 31 (engine shutdown, engine overheat) or
code 33 (engine shutdown, excessive no oil con-
dition).
Running Mode
LED 1 – Low charging output, “CHARGING
FAULT.” For LIGHT ON, investigate possible fault
codes:
• Code 17 – system voltage (55 V) below range
• Code 18 – system voltage (55 V) above range
• Code 26 – low battery (12 V) voltage
• Code 27 – high battery (12 V) voltage
• Code 77 – S.A.C. overcurrent fault
LED 2 – Damaged injector circuit, ignition primary
circuit, or fuel pump circuit, “INJECTOR/IGNITION
FAULT.” For LIGHT ON, investigate possible fault
codes:
• Code 51 – cylinder no. 1 injector circuit open
• Code 52 – cylinder no. 2 injector circuit open
• Code 53 – cylinder no. 3 injector circuit open
• Code 54 – cylinder no. 4 injector circuit open
• Code 55 – cylinder no. 5 injector circuit open
• Code 56 – cylinder no. 6 injector circuit open
• Code 61 – cylinder no. 1 injector circuit short
• Code 62 – cylinder no. 2 injector circuit short
• Code 63 – cylinder no. 3 injector circuit short
• Code 64 – cylinder no. 4 injector circuit short
• Code 65 – cylinder no. 5 injector circuit short
• Code 66 – cylinder no. 6 injector circuit short
• Code 81 – no. 1 ignition primary circuit open
• Code 82 – no. 2 ignition primary circuit open
• Code 83 – no. 3 ignition primary circuit open
• Code 84 – no. 4 ignition primary circuit open
• Code 85 – no. 5 ignition primary circuit open
• Code 86 – no. 6 ignition primary circuit open
• Code 91 – fuel pump circuit open
• Code 94 – fuel pump circuit short
LED 3 – Sensor circuits (5 V), “SENSOR FAULT.”
For LIGHT ON, investigate possible fault codes:
• Code 12 – TPS circuit fault
• Code 13 – TPS below expected range
• Code 14 – TPS above expected range
• Code 16 – CPS, intermittent loss of sync
• Code 28 – shift switch malfunction
• Code 41 – PORT temp. sensor circuit fault
• Code 42 – PORT temp. below expected range
• Code 44 – BP sensor circuit fault
1. LED indicators 005239
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