44342T Mercury COVER

Table 1
Code Description Conditions for Code Notes
110-3 Coolant Temp Sensor Voltage Above Normal Battery voltage is normal The voltage is 4.9 V or higher for 2.8 seconds or more. The system will use a default parameter of −25° C (−13° F) at start-up and 80° C (176° F) all other times. Engine is derated.
Warning Level 2
Symptoms include increased white smoke at low temperatures.
110-4 Coolant Temp Sensor Voltage Below Normal Battery voltage is normal The voltage is .1 volts or lower for 2.8 seconds or more. The system will use a default parameter of −25° C (−13° F) at start-up and 80° C (176° F) all other times. Engine is derated.
Warning Level 2
Symptoms include increased white smoke at low temperatures.
171-3 Intake Air Temp Sensor (in MAF) Voltage Above Normal Battery voltage is normal The voltage is 4.9 V or higher for 2.8 seconds or more. The system will use a default of 25° C (77° F)
Warning Level 2
171-4 Intake Air Temp Sensor (in MAF) Voltage Below Normal Battery voltage is normal The voltage is .1 volts or lower for 2.8 seconds or more. The system will use a default of 25° C (77° F).
Warning Level 2
172-3 Intake Air Temp Sensor Voltage Above Normal Battery voltage is normal The voltage is 4.9 V or higher for 2.8 seconds or more. The system will use a default of -20° C (104° F) at startup and then 40° C (104° F) at all other conditions.
Warning Level 2
Increased white smoke at low temperatures.
172-4 Intake Air Temp Sensor Voltage Below Normal Battery voltage is normal The voltage is .1 volts or lower for 2.8 seconds or more. The system will use a default of −20° C (−4° F)at start-up, and then 40° C (104° F) at all other conditions.
Warning Level 2
Increased white smoke at low temperatures.
174-3 Fuel Temp Sensor Voltage Above Normal
(Does not apply to C3.8 Tier 4 Final / Stage IV) Battery voltage is normal The voltage is 4.9 V or higher for 2.8 seconds or more. The system will use a default parameter of −20° C (−4° F) at startup and 40° C (104° F) all other times.
Warning Level 2
174-4 Fuel Temp Sensor Voltage Below Normal
(Does not apply to C3.8 Tier 4 Final / Stage IV) Battery voltage is normal The voltage is .1 volts or lower for 2.8 seconds or more. The system will use a default parameter of −20° C (−4° F)at start-up and 40° C (104° F) all other times.
Warning Level 2
4765-3 DOC Inlet Exhaust Temp Sensor Voltage Above Normal Battery Voltage is normal.
Coolant temperature is 65° C (149° F) or higher, continues longer than 5 minutes after engine starting
DPF Inlet temperature is between 100° C (212° F)and 800° C (1472° F)for more than 10 seconds
The DOC inlet temperature and DPF inlet temperature either or both are less than or equal to 890° C (1634° F), while the voltage is above 4.9 V for more than 120 seconds.
Engine is Derated.
Warning Level 2
3242-3 DPF Inlet Temperature Sensor Voltage Below Normal Battery Voltage is normal.
Coolant temperature is 65° C (149° F) or higher, continues longer than 5 minutes after engine starting
DPF Inlet temperature is between 100° C (212° F)and 800° C (1472° F)for more than 10 seconds
3246-3 DPF Outlet Temperature Sensor Voltage Below Normal Battery Voltage is normal.
Coolant temperature is 65° C (149° F) or higher, continues longer than 5 minutes after engine starting
DPF Outlet temperature is between 100° C (212° F)and 800° C (1472° F) for more than 10 seconds.
4765-4 DOC Inlet Temperature Sensor Voltage Below Normal Battery Voltage is normal
Coolant temperature is 65 ° (149 °F) or more: continues longer than 10 min. after engine starting
100 °C (212 °F) ≤ T0 ≤ 800 C (1472 °F): continues longer than 10 sec. or 100 °C (212 °F) ≤ T2 ≤ 800 °C (1472 °F): continues longer than 10 sec. Diesel Particulate Filter "DPF" inlet temperature sensor (T1) voltage: 0.08 V or less
Open circuit or +B short circuit of sensor / harness
DPF inlet temperature sensor (T1) voltage: 4.92 or more
Engine derates
3242-4 DPF Inlet Temperature Sensor Voltage Below Normal
3246-4 DPF Outlet Temperature Sensor Voltage Below Normal Note: A -3 code is detecting an open circuit or +B short circuit of the sensor or the wiring harness.Note: A -4 code is detecting a ground short circuit of the sensor or the wiring harness.Note: Diagnostic codes for a short circuit or an open circuit are most commonly caused by an engine harness routing near a connector. Refer to Special Instruction, REHS7774 for more information on repairing the jumper harness.
Illustration 1 g03431090
Table 2
Resistance of Temperature Sensors at Specific Temperatures
Temperature Temperature Sensors: Coolant, Mass Air Flow , Fuel Air Inlet Temperature Sensor
20° C (68° F) Approximately 2.5 kΩ Approximately 2.4 kΩ
40° C (104° F) Approximately 1.2 kΩ -
60° C (140° F) Approximately 0.58 kΩ Approximately 0.58 kΩ
80° C (176° F) Approximately 0.3 kΩ Approximately 0.18 kΩ
100° C (212° F) Approximately 0.3 v (100C spec only applicable to Coolant Temperature Sensor) -
Resistance of Aftertreatment Temperature Sensor at Specific Temperatures
Temperature Resistance
100° C (212° F) Approximately 18.3 kΩ