0397935 JOHNSON OWNER'S MANUAL

Table 1
Diagnostic Codes Table    
Description    Conditions which Generate this Code    System Response    
100-3 Engine Oil Pressure Sensor : Voltage Above Normal     The Electronic Control Module (ECM) has detected a voltage on the signal wire of the sensor that is greater than 4.95 V for ten seconds.     The code is logged.
The amber warning lamp is illuminated.
The service tool displays "Error Indicator" on the status screen for this parameter.    
100-4 Engine Oil Pressure Sensor : Voltage Below Normal     The ECM has detected a voltage on the signal wire of the sensor that is less than 0.2 V for ten seconds.    
3563-3 Engine Intake Manifold #1 Absolute Pressure : Voltage Above Normal     The ECM has detected a voltage on the signal wire of the sensor that is greater than 4.95 V for five seconds.     The code is logged.
The amber warning lamp is activated.
The service tool displays "Error Indicator" on the status screen for this parameter.    
3563-4 Engine Intake Manifold #1 Absolute Pressure : Voltage Below Normal     The ECM has detected a voltage on the signal wire of the sensor that is less than 0.2 V for five seconds.    
4289-3 Aftertreatment #1 Three Way Catalytic Converter Intake Gas Temperature : Voltage Above Normal     The ECM has detected a voltage on the signal wire of the sensor that is greater than 4.8 V for five seconds.     The code is logged.
The amber warning lamp is activated.
The service tool displays "Error Indicator" on the status screen for this parameter.    
4289-4 Aftertreatment #1 Three Way Catalytic Converter Intake Gas Temperature : Voltage Below Normal     The ECM has detected a voltage on the signal wire of the sensor that is less than 0.2 V for five seconds.    
4290-3 Aftertreatment #1 Three Way Catalytic Converter Outlet Gas Temperature : Voltage Above Normal     The ECM has detected a voltage on the signal wire of the sensor that is greater than 4.8 V for five seconds.     The code is logged.
The amber warning lamp is activated.
The service tool displays "Error Indicator" on the status screen for this parameter.    
4290-4 Aftertreatment #1 Three Way Catalytic Converter Outlet Gas Temperature : Voltage Below Normal     The ECM has detected a voltage on the signal wire of the sensor that is less than 0.2 V for five seconds.    The following analog sensors are used by this engine:
Engine oil pressure sensor
Intake manifold pressure sensor
Temperature sensor at the inlet of the catalytic converter
Temperature sensor at the outlet of the catalytic converterBackground 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 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 g01960470
Schematic for the analog sensors
Illustration 2 g01960583
Locations of the sensors that are associated with the analog signal (left side engine view) (1) Intake manifold pressure sensor
Illustration 3 g03431228
Locations of the sensors that are associated with the analog signal (right side engine view) (2) Engine oil pressure sensor
Illustration 4 g02471238
Locations of the analog sensors that are for the catalytic converter/muffler (3) Temperature sensor for the inlet of the catalytic converter/muffler (4) Temperature sensor for the outlet of the catalytic converter/muffler
Illustration 5 g01960607
Locations of the connectors at the ECM for the analog sensors (5) Connector for the sensors at the catalytic converter (6) J2/P2 ECM connectors (7) J1/P1 ECM connectors
Illustration 6 g01960613
Terminal locations at the P1 ECM connector for the analog sensors (P1-24) Temperature at the outlet of the catalytic converter (P1-34) Analog return (P1-41) Analog sensor supply (P1-42) Analog sensor supply (P1-54) Temperature at the inlet of the catalytic converter (P1-55) Intake manifold pressure
Illustration 7 g01960623
Terminal locations at the P2 ECM connector for the analog sensors (P2-37) Analog return (P2-38) Analog return (P2-45) Analog return (P2-46) Analog sensor supply (P2-47) Analog sensor supply (P2-56) Engine oil pressure