804237 Mercury HOSE

Table 1
Code and Description Conditions which Generate this Code System Response
94-3
Fuel Delivery Pressure Sensor voltage above normal The Electronic Control Module (ECM) detects signal voltage that is above normal for eight seconds. The code is logged. The value of the parameter is set to a gauge pressure of 600 kPa (87 psi).
94-4
Fuel Delivery Pressure Sensor voltage below normal The ECM detects signal voltage that is below normal for eight seconds.
100-3
Engine Oil Pressure Sensor voltage above normal The ECM detects signal voltage that is not in the acceptable range. 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 not in the acceptable range.
274-3
Atmospheric Pressure Sensor : Voltage Above Normal The ECM detects signal voltage that is not in the acceptable range. The ECM detects signal voltage that is not in the acceptable range.
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 not in the acceptable range.
275-3
Right Turbocharger Inlet Pressure Sensor : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
275-4
Right Turbocharger Inlet Pressure Sensor : Voltage Below Normal The ECM detects signal voltage that is below normal for one second.
276-3
Left Turbocharger Inlet Pressure Sensor : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
276-4
Left Turbocharger Inlet Pressure Sensor : Voltage Below Normal The ECM detects signal voltage that is below normal for one second.
827-3
Left Exhaust Temperature Sensor voltage above normal The ECM detects a signal voltage that is above normal. The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a default value.
827-4
Left Exhaust Temperature Sensor voltage below normal The ECM detects a signal voltage that is below normal.
828-3
Right Exhaust Temperature Sensor voltage above normal The ECM detects a signal voltage that is above normal. The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a default value.
828-4
Right Exhaust Temperature Sensor voltage below normal The ECM detects a signal voltage that is below normal.
1785-3 Intake Manifold Pressure Sensor voltage above normal The ECM detects signal voltage that is above normal for two seconds. The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a default value.
1785-4 Intake Manifold Pressure Sensor voltage below normal The ECM detects signal voltage that is below normal for two seconds.
2350-3
Left Exhaust #2 Temperature Sensor voltage above normal The Electronic Control Module (ECM) detects a signal voltage that is above normal. The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a default value.
2350-4
Left Exhaust #2 Temperature Sensor voltage below normal The Electronic Control Module (ECM) detects a signal voltage that is below normal.
2351-3
Right Exhaust #2 Temperature Sensor voltage above normal The Electronic Control Module (ECM) detects a signal voltage that is above normal. The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a default value.
2351-4
Right Exhaust #2 Temperature Sensor voltage below normal The Electronic Control Module (ECM) detects a signal voltage that is below normal.
2738-3
Turbocharger #1 Compressor Inlet Pressure Sensor : Voltage Above Normal The Electronic Control Module (ECM) detects a signal voltage that is above normal. The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a default value.
2738-4
Turbocharger #1 Compressor Inlet Pressure Sensor : Voltage Below Normal The Electronic Control Module (ECM) detects a signal voltage that is below normal. The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a default value.
2739-3
Turbocharger #2 Compressor Inlet Pressure Sensor : Voltage Above Normal The Electronic Control Module (ECM) detects a signal voltage that is above normal. The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a default value.
2739-4
Turbocharger #2 Compressor Inlet Pressure Sensor : Voltage Below Normal The Electronic Control Module (ECM) detects a signal voltage that is below normal. The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a default value. System OperationUse this procedure to troubleshoot any suspect problems with the following sensors:
Fuel pressure sensor
Engine oil pressure sensor
Atmospheric pressure sensor
Exhaust temperature tensor
Intake manifold pressure sensorThe supply voltage is routed to terminal 1 of each sensor connector. The sensor return is routed to terminal 2 of each sensor connector. For the pressure sensors, the sensor signal is routed to terminal 3 of each sensor connector. The sensor signal for the exhaust temperature sensors is routed to terminals 3 and 4 of the connector for the sensor buffer.The ECM provides short circuit protection for the internal power supply. A short circuit to the battery will not damage the internal power supply.Diagnostic Testing using Caterpillar Electronic Technician (ET)Wiggle Test - The wiggle test allows the technician to monitor the status of the signals from the sensors. For additional information regarding the wiggle test, refer to the documentation that accompanies the Cat ET software.
Illustration 1 g02151854
Terminal locations at the P1 ECM connector for the analog sensors
(P1-2) Analog supply
(P1-3) Analog return
(P1-15) Turbocharger inlet pressure sensorTest Step 1. CHECK FOR DIAGNOSTIC CODES
Connect Caterpillar Electronic Technician (ET) to the service tool connector. Establish a connection with the engine ECM.
Turn the keyswitch to the ON position.
Look for the following codes that are active or logged:
-3
-4Results:
Active -3 Code - A -3 diagnostic code is active. Proceed to Test Step 2.
Active -4 code - A -4 diagnostic code is active. Proceed to Test Step 3.Test