GUARD 3442297 - Caterpillar

Illustration 1 g00730083
Schematic of the Steering Oil Temperature Sensor This diagnostic code is recorded when the VIMS reads the voltage of the steering oil temperature sensor and the voltage above normal. The sensor sends a PWM signal to the VIMS module. The possible causes of this diagnostic code are listed here:
A shorted harness
An open supply circuit to the sensor
A failed sensor
An open circuit
The VIMS interface Module may have failed. This is unlikely.Note: Ensure that the diagnostic code is still active.Note: The following procedure can create numerous related diagnostic codes. Reconnect all harnesses. Then, the related diagnostic codes will be shown as being NOT active. Complete the following procedure. Then, clear all of the related diagnostic codes.
CHECK THE SUPPLY VOLTAGE AT THE SENSOR.
Turn the disconnect switch and the key start switch to the ON position.
Check the voltage at the machine harness connector of the sensor from contact A (sensor supply) to contact B (ground). Do NOT disconnect the sensor. Use the 7X-1710 Cable probes to measure the voltage. Expected Results: The voltage should measure approximately 8 DCV.Results:
OK - Voltage is approximately 8 DCV. The voltage is correct. Proceed to 3.
NOT OK - Voltage is not approximately 8 DCV. There is an open in the machine harness or the ECM has failed. It is unlikely that the ECM has failed. Proceed to 2.
CHECK FOR AN OPEN IN THE SUPPLY CIRCUIT.
The key start switch and the disconnect switch remain in the ON position.
Disconnect the sensor from the machine harness.
At the machine harness connector for the sensor, measure the voltage from contact A (sensor supply) to frame ground.Expected Results: The voltage should measure approximately 8 DCV. Results:
OK - Voltage measures approximately 8 DCV. The return circuit is