TUBE AS 4692754 - Caterpillar

codes. Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Determine if a diagnostic code has occurred several times. Note: A diagnostic code that is logged several times is an indication of an intermittent problem. Most intermittent problems are the result of a bad connection between a socket and a pin in a connector. Or, intermittent problems are the result of a bad connection between a wire and a terminal. The problem may be caused by moisture, corrosion, or wear.
Determine if the problem is active and related to one of the following diagnostic codes:
-3
-4Expected Result:A diagnostic code is not active.Results:
OK - A diagnostic code is not active.Repair: The problem may be intermittent. If the problem is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - A diagnostic code is active. Proceed to Test Step 2.Test Step 2. Check the Analog Sensor Supply Voltage at the Sensor Connector
Do not disconnect the suspect connector.
Connect a voltmeter between pin 1 and pin 2 on the sensor side of the connector for the suspect sensor.
Measure the voltage between pin 1 and pin 2 for the suspect sensor or sensors.
Wiggle the harness while you monitor the voltage on the voltmeter. Perform the 45 N (10 lb) pull test on each wire in the circuit. Each terminal and each connector should easily withstand 45 N (10 lb) of tension and each wire should remain in the connector body. This test checks whether the wire was properly crimped in the terminal and whether the terminal was properly inserted into the connector. Expected Result:The analog sensor supply voltage is 5.0 0.5 VDC.Results:
OK - The voltage is 5.0 0.5 VDC. An active -3 diagnostic code is present. Proceed to Test Step 3.
OK - The voltage is 5.0 0.5 VDC. An active -4 diagnostic code is present. Proceed to Test Step 5.
Not OK - The voltage is not 5.0 0.5 VDC. Proceed to Test Step 7.Test Step 3. Check for a Short to the +Battery at the Sensor Connector
Measure the voltage on the harness side of the sensor connector between pin 2 and pin 3 for the suspect sensor, or sensors. Expected Result:The signal voltage is less than battery voltage.Results:
OK - The signal voltage is less than battery voltage. Proceed to Test Step 4.
Not OK - The signal voltage is equal to battery voltage.Repair: There is a short in the harness to the +Battery. Repair the wiring.STOPTest Step 4. Create a Short at the Sensor Connector
Turn the main disconnect switch to the OFF position.
Disconnect the suspect sensor.
Use a wire jumper in order to create a short between terminal 3 (signal) and terminal 2 (sensor return) at the sensor connector.
Restore electrical power to the ECM.
Monitor the diagnostic codes on Cat ET. Check for an active -4 diagnostic code for the suspect sensor. Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Turn the main disconnect switch to the OFF position. Expected Result:A -4 diagnostic