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MERCRUISER Inboard Fault Codes


Alarm - Mercruiser Inboard Marine Engine Fault Code № - Fault - Pwr Limit - Description

 

Constant horn

4 ECT Coolant Overheat 6-100% Overheat condition detected by Engine Coolant Temp (ECT) circuit.

13 Low Oil Pressure Strategy 0-100% Low oil pressure strategy. Stop immediately and check engine oil.

19 Overspeed RPM Limit Engine over RPM limit

22 Port EMCT CKT Overheat 6-100% Overheat in port Exhaust Manifold Coolant Temp (EMCT), 212°F (100°C)

limit

23 Sea Pump PSI Lo 6-100% Low water pressure strategy, defaults to 43.4 psi.

28 STB EMCT CKT Overheat 6-100% Overheat in stbd Exhaust Manifold Coolant Temp (EMCT), 212°F (100°C)

limit

 

Steady beeps

12 Low Drive Lube Strategy 0-100% Low oil in sterndrive. Stop immediately and check drive lube bottle.

2 beeps once per minute

1 Cam Sensor 90% Open or short in cam sensor. Engine must be cranking to set this code.

2 ECT CKT HI 90% Open in Engine Coolant Temp (ECT) circuit

3 ECT CKT LO 90% Short in Engine Coolant Temp (ECT) circuit

5 EST 1-8 Open 100% Open in Electronic Spark Timing (EST) circuit. Check plug wires.

6 EST 1-8 Short 100% Short in Electronic Spark Timing (EST) circuit. Check plug wires.

7 Fuel Injector 1-8 Open 100% Open in fuel injector circuit.

8 Fuel Injector 1-8 Short 100% Short in fuel injector circuit.

9 IAC Output 90% Faulty Idle Air Control (IAC) valve. Only with RPM

10 Knock Sensor 1 90% Alarm sounds for 20 seconds in NEUTRAL, and indefinitely in gear.

11 Knock Sensor 2 90% Alarm sounds for 20 seconds in NEUTRAL, and indefinitely in gear.

14 MAP Sensor 1 Input High 90% Short in Manifold Absolute Pressure (MAP) circuit (No visual on SC1000)

15 MAP Sensor 1 Input Low 90% Open in Manifold Absolute Pressure (MAP) circuit (No visual on SC1000)

16 MAT Sensor 90% Open or short in Manifold Air Temperature (MAT) circuit.

17 Oil PSI CKT Hi 90% Short in oil pressure circuit, defaults to 51.7 psi.

18 Oil PSI CKT Lo 90% Open in oil pressure circuit, defaults to 0 psi.

20 Port EMCT CKT Hi 90% Open in port Exhaust Manifold Coolant Temp (EMCT), defaults to 32°F.

21 Port EMCT CKT Lo 90% Short in port Exhaust Manifold Coolant Temp (EMCT), defaults to 32°F.

24 Sea Pump CKT Hi 90% Open in raw water pressure circuit.

25 Sea Pump CKT Lo 90% Short in raw water pressure circuit.

26 STB EMCT CKT Hi 90% Open in stbd Exhaust Manifold Coolant Temp (EMCT), defaults to 32°F.

27 STB EMCT CKT Lo 90% Short in stbd Exhaust Manifold Coolant Temp (EMCT), defaults to 32°F.

30 TPS1 CKT Hi 90% Short in Throttle Position Sensor (TPS) circuit, signal to 5v+, engine will not start. Refer to data monitor screen.

31 TPS1 CKT Lo 90% Open in Throttle Position Sensor (TPS) circuit.

32 TPS1 Range Hi 90% Above 4.8v, 994 counts in Throttle Position Sensor (TPS) circuit.

33 TPS1 Range Lo 90% Below 0.5v, 35 counts in Throttle Position Sensor (TPS) circuit.

36 5 VDC PWR Low varies Short any 5v+ to ground.

No alarm

29 Steer CKT Hi 100% Open and short in steering angle sensor circuit.

34 Trim CKT Hi 100% Short in trim sensor, high range, visual warning on SC1000 only.

35 Trim CKT Lo 100% Open in trim sensor, low range, visual warning on SC1000 only. Constant horn 2 beeps once per minute