808009A 2 Mercruiser SWITCH ASSEMBLY, Shift Interrupt

Table 1
Diagnostic Trouble Codes for the Engine Temperature Sensors    
CDL Code    Description    Notes    
110-3     Engine Coolant Temperature Sensor : Voltage Above Normal     The ECM detects the following conditions:
The signal voltage from the engine coolant temperature sensor is greater than 4.95 VDC for more than 8 seconds.
An active diagnostic code will be generated after 8 seconds. The diagnostic code will be logged if the engine has been operating for more than 7 minutes.
The ECM will default to
90 °C (194 °F) for engine coolant temperature. "Voltage Above Normal" will be displayed next to the status for "Engine Coolant Temperature" on the electronic service tool.
The engine may show the following symptoms:
Poor stability
Poor cold running
White smoke    
110-4     Engine Coolant Temperature Sensor : Voltage Below Normal     The ECM detects the following conditions:
The signal voltage from the engine coolant temperature sensor is less than 0.2 VDC for more than 8 seconds.
An active diagnostic code will be generated after 8 seconds. The diagnostic code will be logged if the engine has been operating for more than 7 minutes.
The ECM will default to
90 °C (194 °F) for engine coolant temperature. "Voltage Below Normal" will be displayed next to the status for "Engine Coolant Temperature" on the electronic service tool.
The engine may show the following symptoms:
Poor stability
Poor cold running
White smoke    
172-3     Intake Manifold Air Temperature Sensor : Voltage Above Normal     The Electronic Control Module (ECM) detects the following conditions:
The signal voltage from the intake manifold air temperature sensor is greater than 4.95 VDC for more than 8 seconds.
Engine coolant temperature is above
−10 °C (15.0 °F).
The ECM will use the default value of
70 °C (158 °F) for the intake manifold air temperature. "Voltage High" will be displayed next to the status for "Intake Manifold Air Temperature" on the electronic service tool.
The engine may show the following symptoms:
Poor stability
Poor cold running
Poor acceleration under load
White smoke    
172-4     Intake Manifold Air Temperature Sensor : Voltage Below Normal     The ECM detects the following conditions:
The signal voltage from the intake manifold air temperature sensor is less than 0.2 VDC for more than 8 seconds.
The ECM will use the default value of
70 °C (158°F) for the intake manifold air temperature. "Voltage Low" will be displayed next to the status for "Intake Manifold Air Temperature" on the electronic service tool.
The engine may show the following symptoms:
Poor stability
Poor cold running
Poor acceleration under load
White smoke    
174-3     Fuel Temperature Sensor : Voltage Above Normal     The ECM detects the following conditions:
The signal voltage from the fuel temperature sensor is greater than 4.95 VDC for more than 8 seconds.
The ECM will default to
40° C (104° F) for fuel temperature. "Voltage Above Normal" will be displayed next to the status for "Engine Fuel Temperature" on the electronic service tool.    
174-4     Fuel Temperature Sensor : Voltage Below Normal     The ECM detects the following conditions:
The signal voltage from the fuel temperature sensor is less than 0.2 VDC for more than 8 seconds.
The ECM will default to
40° C (104° F) for fuel temperature. "Voltage Below Normal" will be displayed next to the status for "Engine Fuel Temperature" on the electronic service tool.    
2526-3     Air Inlet Temperature Sensor : Voltage Above Normal     The ECM detects the following conditions:
The signal voltage from the air inlet temperature sensor is greater than 4.95 VDC for at least 8 seconds.    
2526-4     Air Inlet Temperature Sensor : Voltage Below Normal     The ECM detects the following conditions:
The signal voltage from the air inlet temperature sensor is less than 0.2 VDC for at least 8 seconds.    
3372-3     Engine Charge Air Cooler #1 Outlet Temperature Sensor : Voltage Above Normal     The ECM detects the following conditions:
The signal voltage for the charge air cooler outlet temperature sensor is greater than 4.95 VDC for at least 8 seconds.
The ECM has been powered for at least 7 seconds.
The warning light will come on. The ECM will log the diagnostic code. The engine will be derated.    
3372-4     Engine Charge Air Cooler #1 Outlet Temperature Sensor : Voltage Below Normal     The ECM detects the following conditions:
The signal voltage for the charge air cooler outlet temperature sensor is less than 0.2 VDC for at least 8 seconds.
The ECM has been powered for at least 7 seconds.
The warning light will come on. The ECM will log the diagnostic code. The engine will be derated.    
3386-3     EGR Temperature Sensor : Voltage Above Normal     The ECM detects the following conditions:
The signal voltage from the Nox Reduction System (NRS) temperature sensor is greater than 4.975 VDC for more than 8 seconds.    
3386-4     EGR Temperature Sensor : Voltage Below Normal     The ECM detects the following conditions:
The signal voltage from the NRS temperature sensor is less than 0.2 VDC for more than 8 seconds.    Note: The following conditions must exist before any of the above codes will become active:
The ECM has been powered for at least 2 seconds.
Diagnostic code 168-4 is not active.The ECM will log the diagnostic code. If equipped, the warning light will come on.This procedure covers open circuit diagnostic codes and short circuit diagnostic codes that are associated with the following sensors:
Coolant temperature sensor
Intake manifold air temperature sensor
NRS temperature sensor
Fuel temperature sensor
Air inlet temperature sensorThe following background information is related to this procedure:The troubleshooting procedures for the diagnostic codes of each temperature sensor are identical. The temperature sensors have two terminals. The signal line is connected to each sensor connector terminal 1. Terminal 2 is the return line. The signal voltage from terminal 1 of each sensor is supplied to the appropriate terminal in the P2/J2 connector or the P1/J1 connector.Pull-up VoltageThe ECM continuously outputs a pull-up voltage on the circuit for the sensor signal wire. The ECM uses this pull-up voltage in order to detect an open in the signal circuit. A voltage above a threshold on the signal circuit generates an open circuit diagnostic code (XXXX-3).If the sensor is disconnected