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Table 1
Diagnostic Codes Table
J1939 Code and Description Conditions which Generate this Code System Response
100-3 Engine Oil Pressure Sensor voltage above normal The ECM detects signal voltage that is above normal for one second. 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 below normal for one second.
101-3 Engine Crankcase Pressure : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
101-4 Engine Crankcase Pressure : Voltage Below Normal The ECM detects signal voltage that is below normal for one second.
127-3 Transmission Oil Pressure : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
127-4 Transmission Oil Pressure : Voltage Below Normal The ECM detects signal voltage that is below normal for one second.
108-3 Barometric Pressure : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
108-4 Turbocharger Outlet Pressure Sensor voltage above normal The ECM detects signal voltage that is below normal for one second.
1208-3 Engine Pre-filter Oil Pressure : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
1208-4 Engine Pre-filter Oil Pressure : Voltage Below Normal The ECM detects signal voltage that is below normal for one second.
3563-3 Engine Intake Manifold #1 Absolute Pressure : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
3563-4 Engine Intake Manifold #1 Absolute Pressure : Voltage Below Normal The ECM detects signal voltage that is below normal for one second.
1176-3 Engine Turbocharger 1 Compressor Inlet Pressure : Voltage Above Norm The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
1176-4 Engine Turbocharger 1 Compressor Inlet Pressure : Voltage Below Normal The ECM detects signal voltage that is below normal for one second.
1177-3 Engine Turbocharger 2 Compressor Inlet Pressure : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
1177-4 Engine Turbocharger 2 Compressor Inlet Pressure : Voltage Below Normal The ECM detects signal voltage that is below normal for one second.
5578-3 Engine Fuel Delivery Absolute Pressure : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
5578-4 Engine Fuel Delivery Absolute Pressure : Voltage Below Normal The ECM detects signal voltage that is above normal for one second.
5580-3 Engine Fuel Delivery Absolute Pressure : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
5580-4 Engine Fuel Delivery Absolute Pressure : Voltage Below Normal The ECM detects signal voltage that is above normal for one second. System OperationUse this procedure to troubleshoot any suspect problems with the following sensors for the primary and/or secondary ECM:
Barometric pressure sensor (Primary ECM)
Filtered engine oil pressure sensor (Primary & Secondary ECM)
Transmission oil pressure sensor (Primary & Secondary ECM)
Filtered fuel pressure sensor (Primary & Secondary ECM)
Left turbocharger inlet pressure sensor (Primary ECM)
Right turbocharger inlet pressure sensor (Primary ECM)
Turbocharger outlet pressure sensor (Primary & Secondary ECM)
Unfiltered engine oil pressure sensor (Primary & Secondary ECM)
Unfiltered fuel pressure sensor (Primary ECM)
Crankcase pressure sensor (Primary ECM)
Jacket water coolant pressure sensor (Primary & Secondary ECM)Background InformationThe ECM performs an automatic calibration of these sensors whenever the ECM is powered and the engine is off for at least five seconds. During an automatic calibration, the ECM calibrates pressure sensors to the value of the atmospheric pressure sensor and against an acceptable offset pressure range.The 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 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 g03065189
Typical primary schematic
Illustration 2 g03065186
Typical secondary schematic
Illustration 3 g03065188
Terminal locations at the P1 ECM connectors (prim.) for the analog sensors and the digital sensors
(P1-15) Left turbo inlet pressure (prim.)
(P1-16) Transmission oil pressure (prim.)
(P1-27) Right turbo inlet pressure (prim.)
Illustration 4 g03065190
Terminal locations at the P2 ECM connector (prim. & sec.) for the analog sensors
(P2-15) Intake manifold pressure (prim. & sec.)
(P2-16) Fuel transfer pressure (unfiltered) (prim.)
(P2-17) Analog return (prim.)
(P2-27) Fuel transfer pressure (filtered) (prim. & sec.)
(P2-28) Filtered oil pressure (prim. & sec.)
(P2-30) Analog return (prim.)
(P2-33) Crankcase pressure (prim.)
(P2-54) Analog return (prim.)
(P2-57) Jacket water pressure (prim. & sec.)
(P2-66) Unfiltered oil pressure (prim. & sec.)
(P2-72) Analog sensor supply (prim.)
(P2-78) Barometric