PLATE 4809882 - Caterpillar

Illustration 2 g01229023
Typical left side engine view (1) J2/P2 ECM connector
Illustration 3 g01180117
Typical component locations for the 8 volt supply (2) Coolant level sensor (optional) (3) Exhaust temperature sensor (optional)
Thoroughly inspect connector (1). Also, thoroughly inspect each connector for sensors (2) and (3). Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".
Illustration 4 g01229035
P2 terminals that are associated with the 8 volt supply (P2-92) Return (P2-29) +8 VDC
Illustration 5 g01159881
Connector for the sensors (A) +8 VDC (B) Return (C) Signal
Perform a 45 N (10 lb) pull test on each of the wires in the circuit for the digital sensor supply.
Check the allen head screw on each ECM connector for the proper torque. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".
Check the harness and wiring for abrasions and for pinch points from the sensor to the ECM.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - The connectors and wiring are OK. Proceed to Test Step 2.
Not OK - There is a problem with the connectors or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.STOPTest Step 2. Check for Active Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Restore the electrical power to the ECM.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.Note: Wait at least 30 seconds in order for the diagnostic codes to become active.Expected Result:One of the following diagnostic codes is active:
263-03
263-04 Results:
OK - A 03 diagnostic code is active. Proceed to Test Step 3.
OK - A 04 diagnostic code is active. Proceed to Test Step 4.
Not OK - No diagnostic code for the digital supply is active. A problem is suspected with a sensor output signal. In order to verify that the sensor is receiving the correct supply voltage, proceed to Test Step 3.Test Step 3. Check the Voltage on the +8 V Supply Wire
Remove the electrical power from the ECM.
Disconnect the digital sensors from the sensor connectors.
Restore the electrical power to the ECM.
Measure the voltage between terminal A and terminal B at each sensor connector.Expected Result:The voltage is 8.0 0.4 VDC.Results:
OK - The voltage is 8.0 0.4 VDC.Repair: Reconnect the sensors. Clear all diagnostic codes. Check for active diagnostic codes. If the problem is intermittent, refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - The voltage is not 8.0 0.4 VDC. Proceed to Test Step 5.Test Step 4. Disconnect the +8 V Sensors and Check for an Active Diagnostic Code
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Disconnect the digital sensors one at a time from the sensor connectors. Wait for 30 seconds after each sensor is