0393773 JOHNSON CARB ASSY., Lower 150 only

Table 1
Diagnostic Trouble Codes    
J1939 Code and Description    Conditions that Generate the Code    System Response    
100-3 Engine Oil Pressure : Voltage Above Normal     The Electronic Control Module (ECM) detects signal voltage that is above normal for the programmed delay time.     The code is logged.
The value of the parameter is set to a default value.    
100-4 Engine Oil Pressure : Voltage Below Normal     The ECM detects signal voltage that is below normal for the programmed delay time.     The code is logged.
The value of the parameter is set to a default value.    
101-3 Engine Crankcase Pressure : Voltage Above Normal     The ECM detects signal voltage that is above normal for the programmed delay time.     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 the programmed delay time.     The code is logged.
The value of the parameter is set to a default value.    
102-3 Engine Intake Manifold #1 Pressure : Voltage Above Normal     The ECM detects signal voltage that is above normal for the programmed delay time.     The code is logged.
The value of the parameter is set to a default value.    
102-4 Engine Intake Manifold #1 Pressure : Voltage Below Normal     The ECM detects signal voltage that is below normal for the programmed delay time.     The code is logged.
The value of the parameter is set to a default value.    
108-3 Barometric Pressure : Voltage Above Normal     The ECM detects signal voltage that is above normal for the programmed delay time.     The code is logged.
The value of the parameter is set to a default value.    
108-4 Barometric Pressure : Voltage Below Normal     The ECM detects signal voltage that is below normal for the programmed delay time.     The code is logged.
The value of the parameter is set to a default value.    
411-3 Engine Exhaust Gas Recirculation Differential Pressure : Voltage Above Normal     The ECM detects signal voltage that is above normal for the programmed delay time.     The code is logged.
The value of the parameter is set to a default value.    
411-4 Engine Exhaust Gas Recirculation Differential Pressure : Voltage Below Normal     The ECM detects signal voltage that is below normal for the programmed delay time.     The code is logged.
The value of the parameter is set to a default value.    
3358-3 Engine Exhaust Gas Recirculation Inlet Pressure : Voltage Above Normal     The ECM detects signal voltage that is above normal for the programmed delay time.     The code is logged.
The value of the parameter is set to a default value.    
3358-4 Engine Exhaust Gas Recirculation Inlet Pressure : Voltage Below Normal     The ECM detects signal voltage that is below normal for the programmed delay time.     The code is logged.
The value of the parameter is set to a default value.    
3563-3 Engine Intake Manifold #1 Absolute Pressure : Voltage Above Normal     The ECM detects signal voltage that is above normal for the programmed delay time.     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 the programmed delay time.     The code is logged.
The value of the parameter is set to a default value.    
5580-3 Fuel Pressure Sensor - After Fuel Filter : Voltage Above Normal     The ECM detects signal voltage that is above normal for the programmed delay time.     The code is logged.
The value of the parameter is set to a default value.    
5580-4 Fuel Pressure Sensor - After Fuel Filter : Voltage Below Normal     The ECM detects signal voltage that is below normal for the programmed delay time.     The code is logged.
The value of the parameter is set to a default value.    The 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 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 g02196994
Schematic for the active sensors
Illustration 2 g02197753
Terminal locations at the P2 ECM connector for the analog sensors (P2-15) Intake manifold pressure sensor (P2-27) Fuel pressure sensor (filtered fuel pressure) (P2-28) Engine oil pressure sensor (P2-33) Crankcase pressure sensor (P2-40) NRS differential pressure sensor (P2-74) NRS absolute pressure sensor (P2-78) Atmospheric pressure sensorTest Step 1. Check for Diagnostic Codes
Connect Cat 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
-4
-10
-21Results:
Active -3 Code - A -3 diagnostic code is active. Proceed to Test Step 2.
Active -4 code -