0339390 JOHNSON SEAL, Cover to exhaust hsg., upper

Table 1
Diagnostic Codes Table    
Description     Conditions which Generate this Code     System Response    
41-3 8 Volt DC Supply voltage above normal     The 8 volt supply is more than 8.8 VDC for more than one second.     The code is logged.
If equipped, the warning light will come on.    
41-4 8 Volt DC Supply voltage below normal     The 8 volt supply is less than 7.2 VDC for more than one second.     The code is logged.
If equipped, the warning light will come on.    
262-3 5 Volt Sensor DC Power Supply voltage above normal     The 5 volt supply is greater than 5.16 VDC for more than one second.     The code is logged. The check engine lamp will illuminate. The Engine Control Module (ECM) sets all of the pressure sensors to the default value. The engine will be derated.    
262-4 5 Volt Sensor DC Power Supply voltage below normal     The 5 volt supply is less than 4.84 VDC for more than one second.     The code is logged. The check engine lamp will illuminate. The ECM sets all of the pressure sensors to the default value. The engine will be derated.    
100-10 Engine Oil Pressure Sensor abnormal rate of change     The engine speed is greater than 600 rpm.
The engine oil pressure signal is within the limits of
410 kPa (59 psi) to
520 kPa (75 psi) with a pressure variation of less than
1.68 kPa (0.25 psi)for more than 30 seconds.
The engine oil pressure signal remains constant for 30 seconds.     If equipped, the warning lamp will illuminate. The ECM will log the diagnostic code. The engine oil pressure is set to a default value of
500 kPa (72 psi).    
1785-10 Intake Manifold Pressure Sensor abnormal rate of change     The engine speed is more than 1000 rpm. The intake manifold pressure is within the acceptable range.     If equipped, the warning light will illuminate. The ECM will log the diagnostic code. The ECM will flag the intake manifold pressure as being invalid and a default value is used.    The ECM supplies 5.0 0.2 VDC to the following sensors:
Fuel rail pressure sensor
Intake manifold pressure sensor
Engine oil pressure sensor The ECM supplies a regulated voltage of 8.0 0.4 VDC to the speed/timing sensors.The ECM provides short circuit protection for the internal power supply. A short circuit to the battery will not damage the internal power supply.Note: The sensors are not protected from overvoltage. A short from the supply line to the +Battery may damage the sensors. If any of the diagnostic codes are active, it is possible that a sensor has been damaged. Repair the sensor supply and check for any active sensor diagnostic codes in order to determine if a sensor has failed.
Illustration 1 g01323286
Typical example of the schematic for the sensors
Illustration 2 g01173224
Typical example of the pressure sensor (1) 5V supply (2) Return (3) Signal
Illustration 3 g01325938
Typical example of the speed/timing sensor (1) Supply (2) Signal
Illustration 4 g01346922
A typical view of the P2 connector (wire side) pin locations. (10) Crankshaft speed/timing sensor supply (10) Pump speed/timing sensor supply (38) Intake manifold (boost) pressure sensor return (39) Engine oil pressure sensor return (40) Fuel rail pressure sensor return (46) Intake manifold (boost) pressure sensor supply (47) Oil pressure sensor supply (48) Fuel rail pressure sensor supply (51) Fuel rail pressure sensor signal (52) Crankshaft speed/timing sensor signal (53) Pump speed/timing sensor signal (55) Intake manifold (boost) pressure sensor signal (56) Oil pressure sensor signalTest Step 1. Inspect Electrical Connectors and Wiring
Remove the electrical power from the ECM.
Thoroughly inspect the terminal connections on the P2/J2 ECM connectors. Thoroughly inspect the connectors for each engine pressure sensor.
Refer to service Troubleshooting, "Electrical Connectors - Inspect".
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the engine pressure sensors.
Check the torque of the allen head screws for the ECM connectors. Refer to service Troubleshooting, "Electrical Connectors - Inspect".
Check the harness for abrasions and for pinch points from the sensors back to the ECM.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The harness and wiring are OK. Proceed to Test Step 2.
Not OK - There is a problem in the wiring and/or the connectors.Repair: Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are completely coupled.If applicable, use Caterpillar Electronic Technician (ET) to perform a "Wiggle Test".Use Cat ET in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.STOPTest Step 2. Check for Active Diagnostic Codes
Connect Cat ET to the service tool connector.
Restore the electrical power to the ECM.Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes. Look for the following diagnostic codes:
41-3
41-4
100-10
1785-10
262-3
262-4
Remove the electrical power from the ECM.Expected Result:No diagnostic codes are active.Results:
OK - No diagnostic codes are active.Repair: If the problem is intermittent refer to service Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - There is an active 5V supply code at this time. Proceed to Test Step 3.
Not OK - There is an active 8V supply code at this time. Proceed to Test Step 5.Test Step 3. Disconnect the 5 Volt Sensor(s) while you Monitor the Active Diagnostic Codes
Restore the electrical power to the ECM.
Monitor the active diagnostic code screen on Cat ET while you disconnect each 5 Volt sensor connector. Check for an active diagnostic code.Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Disconnect the pressure sensors one at a time.
Remove the electrical power from the ECM.Expected Result:The diagnostic code deactivates when a particular sensor is disconnected.Results:
OK - The -3 code, the -4 code, or the 10 diagnostic code deactivates when a particular