817416A 4 Mercruiser HOUSING ASSEMBLY, Complete

Table 1
Diagnostic Codes Table    
Code    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 default value.    
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 default value.    
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 default value.    
172-3 Intake Manifold Air 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 default value.    
172-4 Intake Manifold Air Temperature Sensor voltage below normal    
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 default value.    
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 default value.    
273-0 Turbocharger Outlet Pressure Sensor high - most severe (3)     The ECM detects turbocharger outlet pressure that is above normal for five seconds.
The ECM has been powered for three seconds.     The code is logged.
The value of the parameter is set to a default value.    
273-3 Turbocharger Outlet 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 default value.    
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 default value.    
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 default value.    
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:
Atmospheric pressure sensor
Engine oil pressure sensor
Turbocharger outlet 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:
Intake manifold air 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 g01455027
Typical schematicTest Step 1. Inspect the Electrical Connectors and Wiring
Turn the keyswitch to the OFF position.
Remove electrical power from the ECM.
Illustration 2 g01139425
ECM (1) J1/P1 connectors (2) J2/P2 connectors
Thoroughly inspect the J2/P2 ECM connector. Thoroughly inspect any connectors that are associated with the analog sensors. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Illustration 3 g01455031
P2 ECM connector (P2-3) Fuel temperature sensor (P2-8) Engine oil pressure sensor (P2-9) Intake manifold air temperature sensor (P2-15) Engine coolant temperature sensor (P2-20) Atmospheric pressure sensor (P2-23) Turbocharger outlet pressure sensor (P2-30) Sensor return (P2-36) Sensor supply
Illustration 4 g01159881
Sensor connector (A) 5 V sensor supply (B) Sensor return (C) Signal
Check the allen head screw from each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque value.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the analog sensors.
Check the harness and wiring for abrasion and for pinch points from the analog sensors to the ECM.Expected Result:All connectors, pins, and sockets are completely inserted and coupled. The harness and wiring are free of corrosion, of abrasion, and of pinch points. All connections and grounds are tight and free of corrosion.Results:
OK - The connectors