SEAL-O-RING 3830217 - Caterpillar

of splices in the harness.STOP
Not OK - A -3 code or a -4 code is active. Proceed to Test Step 2.Test Step 2. Check the 5 Volt Supply Voltage at the Sensor Connector
Do not disconnect the suspect connector.
Connect a voltmeter between pin A and pin B on the sensor side of the connector for the suspect sensor.
Measure the voltage between pin A and pin B for the suspect sensor(s).
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 supply voltage is approximately 5.0 0.2 VDC.Results:
OK - The supply voltage is approximately 5.0 0.2 VDC. An active -3 diagnostic code is present. Proceed to Test Step 3.
OK - The supply voltage is approximately 5.0 0.2 VDC. An active -4 diagnostic code is present. Proceed to Test Step 5.
Not OK - The supply voltage is not approximately 5.0 0.2 VDC. Proceed to Test Step 7.Test Step 3. Check for Battery Voltage on the Signal Wire
Measure the voltage on the harness side of the sensor connector between pin B and pin C for the suspect sensor(s).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 keyswitch to the OFF position.
Disconnect the suspect sensor.
Use a wire jumper in order to create a short between terminal C (signal) and terminal B (sensor return) at the sensor connector.
Turn the keyswitch to the START position.
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 keyswitch to the OFF position.Expected Result:A -4 diagnostic code is now active for the suspect sensor(s).Results:
OK - A -3 diagnostic code was active before creating the short at the sensor connector. A -4 diagnostic code became active after creating the short at the sensor connector. The harness and the ECM are OK. There may be a problem with the sensor.Repair: Temporarily connect a new sensor to the harness, but do not install the new sensor in the engine. Verify that there are no active diagnostic codes for the sensor. If there are no active diagnostic codes for the sensor, permanently install the new sensor. Clear any logged diagnostic codes.STOP
Not OK - A -3 diagnostic code is still active for the suspect sensor(s). The problem may be in the harness or with the ECM. Proceed to Test Step