20025 Mercruiser PLUG, PIPE-FUEL FILTER (SLOTTED)

Table 1
Diagnostic Trouble Codes
J1939 Code CDL Code Code Description
(code descriptions may vary Comments
105-3 172-3 Engine Intake Manifold #1 Temperature : 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
105-4 172-4 Engine Intake Manifold #1 Temperature : 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
110-3 110-3 Engine Coolant Temperature : 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 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
110-4 110-4 Engine Coolant Temperature : 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
441-3 1836-3 Auxiliary Temperature #1 : Voltage Above Normal The ECM detects the following conditions:
The signal voltage from the auxiliary 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.
"Voltage Above Normal" will be displayed next to the status for "Auxiliary Temperature" on the electronic service tool.
441-4 1836-4 Auxiliary Temperature #1 : Voltage Below Normal The ECM detects the following conditions:
The signal voltage from the auxiliary 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.
"Voltage Below Normal" will be displayed next to the status for "Auxiliary Temperature" on the electronic service tool.
2630-3 3372-3 Engine Charge Air Cooler Outlet Temperature : Voltage Above Normal The ECM detects the following conditions:
The signal voltage from the ATAAC outlet 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.
"Voltage Above Normal" will be displayed next to the status for "ATAAC Temperature" on the electronic service tool.
2630-4 3372-4 Engine Charge Air Cooler Outlet Temperature : Voltage Below Normal The ECM detects the following conditions:
The signal voltage from the ATAAC outlet 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.
"Voltage Below Normal" will be displayed next to the status for "ATAAC Temperature" on the electronic service tool.
Follow the troubleshooting procedure in order to identify the root cause of the fault. 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.
There are no active 168-X diagnostic codes.The ECM will log the diagnostic code. If equipped, the warning light will come on.The 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. When the ECM detects a voltage above a threshold on the signal circuit, an open circuit diagnostic code (XXX-3) is generated for the sensor.If the sensor is disconnected, pull-up voltage at the connector indicates that the wires are not open or shorted to ground. If the sensor is disconnected, the absence of pull-up voltage indicates an open in the signal wire or a short to ground. If the sensor is disconnected and the voltage is different from pull-up voltage, the signal wire is shorted to another wire in the harness.
Illustration 1 g06403961
Schematic for passive engine temperature sensors on the P2 connector
Note: For information regarding sensors that are connected to the P1 connector, refer to the Electrical Schematic for the application.
Illustration 2 g06404260
P2 pin locations for the temperature sensors
(4) Intake manifold air temperature sensor signal
(5) Coolant temperature sensor signal
(70) Sensor ground
Illustration 3 g01170313
Typical view of an engine temperature sensor
(1) Signal
(2) Ground