DRIVE GP-FINAL 4235798 - Caterpillar

Illustration 1 g00678190
Schematic of the Machine Autolube Pressure Sensor
This diagnostic code is recorded when the VIMS ECM reads the signal and the frequency of the signal or pulse of the signal is not within an expected range. The possible causes of this failure are listed below:
The sensor has failed.
There are intermittent connections of the machine harness.
There are poor connections of the machine harness.
There are loose mechanical connections.
There is electro-magnetic interference.
The ECM has failed.System Response:This failure causes the machine autolube pressure sensor to indicate the maximum pressure or this failure causes the machine autolube pressure sensor to intermittently indicate the maximum pressure. Note: The "Sensor Voltage Test" within the topic "Pulse Width Modulated Sensor Troubleshooting" also covers the troubleshooting of a failed sensor.Test Step 1. CHECK THE ELECTRONIC CONTROL MODULE AND THE MACHINE HARNESS.
Turn the disconnect switch and the key start switch to the "ON" position.
Disconnect the machine harness from the sensor.
At the machine harness connector for the sensor, measure the voltage between the signal contact C (wire F456-WH(White)) and the ground contact B (wire J842-BK(Black)). Expected Result:The voltage is 5.0 0.5 DCV. Results:
OK - The voltage is 5.0 0.5 DCV. The ECM and the machine harness are correct. Repair: The sensor has failed. Perform the Testing and Adjusting, "Pulse Width Modulated (PWM) Sensor-Test" procedure prior to replacing the sensor.STOP
NOT OK - The voltage is NOT 5.0 0.5 DCV. The ECM or the machine harness have failed. Proceed to test step 2.Test Step 2. CHECK THE GROUND CIRCUIT OF THE MACHINE HARNESS.
The sensor remains disconnected.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect J1 and J2 machine harness connectors from the ECM.
At the machine harness connector for the sensor, measure the resistance between ground contact B (wire J842-BK(Black)) and connector contact J2-19 (wire J842-BK(Black)). Expected Result:The resistance is less than 5.0 ohms. Results:
OK - The resistance is less than 5.0 ohms. The harness resistance is correct. Proceed to test step 3.
NOT OK - The resistance is greater than 5.0 ohms.Repair: The ground circuit in the harness has failed. There is an open circuit between the ground contact and frame ground. Repair the machine harness or replace the machine harness. STOPTest Step 3. CHECK FOR A SHORTED HARNESS .
The sensor and the ECM remain disconnected from the machine harness.
The disconnect switch and the key start switch remain in the OFF position.
Perform the measurements that are listed below at the machine harness connector for the sensor.
Measure the resistance between the signal contact C (wire F456-WH(White)) and contact A (wire K983-BU(Blue)) of the 8 volt sensor supply.
Measure the resistance between the connector contact J1-1 (wire 170-YL(Yellow)) of the ECM and contact C (wire F456-WH(White)) of the harness connector for the sensor. Expected Result:The resistance is greater than 5000 ohms. Results:
OK - The resistance is greater than 5000 ohms. The harness circuit resistance is correct. Proceed to test step 4.
NOT OK - The resistance is less than 5000 ohms. Repair: The machine harness has failed. There is