27037 Mercury STUD, (.250-28 x 1.125), CARBURETOR MOUNTING

Table 1
Diagnostic Codes Table
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 engine has been running for two seconds.
Absolute pressures that are greater than 1101 kPa (160 psi) will also trip this fault. The code is logged.
A snapshot is triggered.
The value of the parameter will be set to 600 kPa (87 psi).
94-4 Fuel Delivery Pressure Sensor voltage below normal The ECM detects signal voltage that is below normal for 180 seconds.
The engine has been running for two seconds.
A barometric pressure of less than 55 kPa (8 psi) will also trip this fault.
100-3 Engine Oil Pressure Sensor voltage above normal The ECM detects signal voltage that is above normal for eight seconds.
The ECM has been powered for at least two seconds.
One of the following conditions must also be satisfied:
Engine speed is greater than 0 rpm.
or
Engine coolant temperature is greater than 38 °C (100 °F).
Absolute pressures that are greater than 1101 kPa (160 psi) will also trip this fault. The code is logged.
A snapshot is triggered.
The value of the parameter will be set to 600 kPa (87 psi).
100-4 Engine Oil Pressure Sensor voltage below normal The ECM detects signal voltage that is above normal for eight seconds.
The ECM has been powered for at least two seconds.
One of the following conditions must also be satisfied:
Engine speed is greater than 0 rpm.
or
The barometric pressure is greater than 55 kPa (8 psi).
A barometric pressure of less than 55 kPa (8 psi) will also trip this fault.
164-3 Injection Actuation Pressure Sensor voltage above normal The ECM detects signal voltage that is above normal for one second. The code is logged.
A snapshot is triggered.
The value of the parameter will be set to 8 MPa (1160 psi).
The engine will run on a default torque map that is stored in the ECM.
The engine will experience a reduction in power.
164-4 Injection Actuation Pressure Sensor voltage below normal The ECM detects signal voltage that is below normal for one second.
274-3 Atmospheric Pressure Sensor voltage above normal The ECM detects signal voltage that is above normal for thirty seconds.
The ECM has been powered for two seconds.
Absolute pressures that are greater than 111 kPa (16 psi) will also trip this fault. The code is logged.
A snapshot is triggered.
The value of the parameter will be set to the value from a map dependent value that is stored in the ECM.
A ten percent derate is applied to the engine power.
274-4 Atmospheric Pressure Sensor voltage below normal The ECM detects signal voltage that is above normal for thirty seconds.
The ECM has been powered for two seconds.
One of the following conditions must be satisfied:
Engine speed equals zero rpm.
or
The engine has been running for ten seconds.
275-3 Right Turbocharger Inlet Pressure Sensor voltage above normal The ECM detects signal voltage that is above normal for twenty seconds.
The ECM has been powered for two seconds. The code is logged.
A snapshot is triggered.
The value of the parameter will be set to the value that is from the atmospheric pressure sensor.
275-4 Right Turbocharger Inlet Pressure Sensor voltage below normal The ECM detects signal voltage that is above normal for twenty seconds.
The ECM has been powered for two seconds.
1785-3 Intake Manifold Pressure Sensor voltage above normal The ECM detects signal voltage that is above normal for two seconds.
The ECM has been powered for two seconds.
One of the following conditions must be satisfied:
Engine speed equals zero rpm.
or
The engine load is less than fifty percent. The code is logged.
A snapshot is triggered.
The value of the parameter will be set to 100 kPa (14.5 psi).
1785-4 Intake Manifold Pressure Sensor voltage below normal The ECM detects signal voltage that is below normal for two seconds.
The ECM has been powered for two seconds. System OperationUse this procedure to troubleshoot any suspect problems with the following sensors:
Atmospheric pressure sensor
Engine oil pressure sensor
Fuel pressure sensor
Injection actuation pressure sensor
Intake manifold pressure sensor
Right turbocharger inlet pressure sensorBackground InformationThe ECM continuously creates a pull-up voltage on the signal wire for each sensor. The ECM uses this pull-up voltage in order to detect a problem in the signal circuit. When the ECM detects voltage that is above a threshold on the signal wire, the ECM activates a high voltage -3 diagnostic code. When the ECM detects voltage that is below a threshold on the signal wire, the ECM activates a low voltage -4 diagnostic code.Note: There may be a delay of 30 seconds or more in order for Caterpillar Electronic Technician (ET) to display an active diagnostic code. When you check for a diagnostic code, be sure to wait at least 30 seconds.The following components can cause these codes:
Electrical connector or wiring
Sensor
ECMThe most likely cause of a code is a problem with an electrical connector or wiring. The least likely cause of a code is the ECM.
Illustration 1 g01339403
Schematic for the analog sensors
Illustration 2 g01339453
Component locations for the analog sensors (Typical left side engine view)
(1) Intake manifold pressure sensor
(2) Atmospheric pressure sensor
(3) Turbocharger inlet pressure sensor
(4) Fuel pressure sensor
(5) Injection actuation pressure sensor
(6) Engine oil pressure sensor
(7) J2/P2 ECM connector
(8) J1/P1 ECM connector
Illustration 3 g01339471
Terminal locations at the P1 ECM connector for the analog sensors
(P1-2) Sensor supply
(P1-3) Sensor return
(P1-15) Turbocharger inlet pressure
Illustration 4 g01339473
Terminal locations at the P2 ECM connector for the analog sensors
(P2-15) Intake manifold pressure
(P2-17) Sensor return
(P2-28) Engine oil pressure
(P2-40) Fuel pressure
(P2-54) Analog return
(P2-57) Atmospheric pressure
(P2-72) Sensor supply
(P2-80) Analog supply
(P2-85) Injection actuation pressure