891795 Mercruiser BRACKET, Seawater Pump

Table 1
Diagnostic Codes Table    
Code and Description    Conditions which Generate this Code    System Response    
100-3 Engine Oil Pressure Sensor voltage above normal     The Electronic Control Module (ECM) detects signal voltage that is above normal for one second.
The ECM has been powered for three seconds.     The code is logged.
The value of the parameter is set to a pressure of
500 kPa (75 psi).    
100-4 Engine Oil Pressure Sensor voltage below normal     The ECM detects signal voltage that is below normal for one second.
The ECM has been powered for three seconds.    
110-3 Engine Coolant Temperature Sensor voltage above normal     The ECM detects signal voltage that is above normal for one second.
The ECM has been powered for three seconds.     The code is logged.
The value of the parameter is set to a pressure of
−40 °C (−40 °F).    
110-4 Engine Coolant Temperature Sensor voltage below normal     The ECM detects signal voltage that is above normal for one second.
The ECM has been powered for three seconds.     The code is logged.
The value of the parameter is set to a pressure of
−40 °C (−40 °F).    
164-3 Injector Actuation Pressure voltage above normal     The ECM detects signal voltage that is above normal for one second.
The ECM has been powered for three seconds.     The code is logged.
The value of the parameter is set to a pressure of
12 MPa (1741 psi).
The current to the IAPCV is set to 0.23 Amp.
The fuel limit is set to a predetermined value.    
164-4 Injector Actuation Pressure voltage below normal     The ECM detects signal voltage that is below normal for one second.
The ECM has been powered for three seconds.
The ECM may be faulty.     The code is logged.
The value of the parameter is set to a pressure of
12 MPa (1741 psi).    
174-3 Fuel Temperature Sensor voltage above normal     The ECM detects signal voltage that is below normal for one second.
The ECM has been powered for three seconds.     The code is logged.
The value of the parameter is set to a pressure of
30 °C (86 °F).    
174-4 Fuel Temperature Sensor voltage below normal     The ECM detects signal voltage that is below normal for one second.
The ECM has been powered for three seconds.     The code is logged.
The value of the parameter is set to a pressure of
30 °C (86 °F).    
175-3 Engine Oil Temperature Sensor voltage above normal     The ECM detects signal voltage that is below normal for one second.
The ECM has been powered for three seconds.     The code is logged.
The value of the parameter is set to a pressure of
90 °C (194 °F).    
175-4 Engine Oil Temperature Sensor voltage below normal     The ECM detects signal voltage that is below normal for one second.
The ECM has been powered for three seconds.     The code is logged.
The value of the parameter is set to a pressure of
90 °C (194 °F).    
273-0 Turbocharger Outlet Pressure Sensor high - most severe (3)     The ECM detects the turbocharger outlet pressure signal above
200 kPa (29 psi). The engine speed is within 50 rpm of low idle for 5 seconds.     The code is logged.
The value of the parameter is set to a pressure of
0.0 kPa (0.0 psi).    
273-3 Turbocharger Outlet Pressure Sensor voltage above normal     The ECM detects signal voltage that is above 4.8 VDC (open or short to battery voltage) for one second.
The ECM has been powered for three seconds.     The code is logged.
The value of the parameter is set to a pressure of
0.0 kPa (0.0 psi).    
273-4 Turbocharger Outlet Pressure Sensor voltage below normal     The ECM detects signal voltage that is below normal for one second.
The ECM has been powered for three seconds.     The code is logged.
The value of the parameter is set to a pressure of
0.0 kPa (0.0 psi).    
274-3 Atmospheric Pressure Sensor voltage above normal     The ECM detects signal voltage that is above normal for one second.
The ECM has been powered for three seconds.     The code is logged.
The value of the parameter is set to a pressure of
45 kPa (7 psi).    
274-4 Atmospheric Pressure Sensor voltage below normal     The ECM detects signal voltage that is below normal for one second.
The ECM has been powered for three seconds.    System OperationUse this procedure to troubleshoot any suspect problems with the following pressure sensors:
Engine oil pressure sensor
Atmospheric pressure sensor
Turbocharger outlet pressure sensor
Injection actuation pressure sensorThe ECM performs an automatic calibration of these sensors whenever the ECM is powered and the engine is off for at least five seconds. During an automatic calibration, the ECM calibrates pressure sensors to the value of the atmospheric pressure sensor and against an acceptable offset pressure range.Use this procedure to troubleshoot any suspect problems with the following temperature sensors:
Engine oil temperature sensor
Fuel temperature sensor
Coolant temperature sensorThe supply voltage is routed to terminal A of each sensor connector. The sensor return is routed to terminal B of each sensor connector. The sensor signal is routed to terminal C of each sensor connector. The ECM provides short circuit protection for the internal power supply. A short circuit to the battery will not damage the internal power supply.The ECM continuously outputs a pull-up voltage on the input terminal from an analog sensor. The ECM uses this pull-up voltage in order to detect an open or a short in the signal circuit. When the ECM detects the presence of a voltage that is above the normal range of the sensor on the signal circuit, the ECM will generate an open circuit diagnostic code 3 for that sensor. When the ECM detects the absence of the pull-up voltage on the signal circuit, the ECM will generate a short circuit diagnostic code 4 for that sensor. The presence of pull-up voltage at the sensor connector indicates that the wires from the sensor connector to the ECM are not open or shorted to ground.
Illustration 1 g01394867
Typical schematicTest Step 1.