Service Manual 75-90 HP E-TEC System Analysis [Emm Led Indicators]

The EMM LED indicators provide a quick reference to the status of several outboard systems. Checking the LEDs FIRST when diagnosing an engine problem can save time.

IMPORTANT: LED 1 is toward the top of the outboard (closest to EMM J1-B connector).

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1. LED indicators

When the EMM is ON (engine not running), the following LEDs should light:

LED 3 – Sensor Circuits working. FLASHING LIGHT indicates Code 57 – engine will not start.

LED 4 – Stop Circuit not grounded–okay to start. FLASHING LIGHT indicates severe overheat or no oil – engine in SHUTDOWN mode.

Starting mode occurs from the time the flywheel begins to turn until the outboard is running for 2 seconds. During starting, all four LEDs should light and then go off in sequence.

LED 1 – CHARGING OKAY – Stator signal 30 V or higher.

LED 2 – CRANK POSITION OKAY – input from CPS, EMM powered ON. For NO LIGHT, check for:

• Code 16 – CPS, intermittent loss of sync

LED 3 – SENSORS OKAY (5 V). For NO LIGHT, check for:

• Code 12 – TPS circuit fault
• Code 13 – TPS below expected range
• Code 14 – TPS above expected range
• Code 19 – In Gear (tiller models)
• Code 23 – EMM temp. sensor circuit fault
• Code 24 – EMM temp. below expected range
• Code 41 – temp. sensor circuit fault
• Code 42 – temp. below expected range
• Code 47 – AT sensor circuit fault
• Code 48 – AT sensor below expected range
• Code 49 – AT sensor above expected range
• Code 58 – Operating temperature not reached For FLASHING LIGHT, check for Code 57.

LED 4 – LANYARD/STOP OKAY. For NO LIGHT, check for:

• Grounded stop circuit.

For FLASHING LIGHT, check for:

• Code 29 – EMM temp. OVER range (flashing)
• Code 31 – Engine temp. OVER range (flashing)
• Code 33 – Engine shutdown, excessive no oil condition

When the outboard is running, all of the LEDs should be off. If a light is on, check for:

LED 1 – CHARGING FAULT:

• 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

LED 2 – INJECTOR/IGNITION FAULT:

• Code 51 – cylinder no. 1 injector circuit open
• Code 52 – cylinder no. 2 injector circuit open
• Code 61 – cylinder no. 1 injector circuit short
• Code 62 – cylinder no. 2 injector circuit short
• Code 81 – no. 1 ignition primary circuit open
• Code 82 – no. 2 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, check for 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 23 – EMM temp. sensor circuit fault
• Code 24 – EMM temp. below expected range
• Code 41 – temp. sensor circuit fault
• Code 42 – temp. below expected range
• Code 47 – AT sensor circuit fault
• Code 48 – AT sensor below expected range
• Code 49 – AT sensor above expected range
• Code 57 – high RPM with low TPS setting
• Code 58 – operating temp. not reached

LED 4 – Engine overheat, EMM temperature or sensor, oil injection pump or sensor, “NO OIL / OVERHEAT.” For LIGHT ON, check for possible fault codes:

• Code 25 – EMM temp. above expected range
• Code 29 – EMM temp. OVER range (flashing)
• Code 31 – engine temp. OVER range (flashing)
• Code 33 – excessive NO OIL faults
• Code 34 – oil injection pump circuit open
• Code 43 – temp. above expected range
• Code 117 – Critical NO OIL detected