STOP 9J7189 - Caterpillar

The engine coolant temperature sensor and the engine oil temperature sensor are the same Caterpillar part. The two sensors are used in different applications. The engine coolant temperature sensor and the oil temperature sensor have the same specifications. Test Procedure
Table 3
Tools Needed    
9U-7330     Multimeter
A multimeter is optional for frequency and duty cycle measurements.     1    
7X-170     Multimeter Probe Group     1    
146-4080     Digital Multimeter (with RS-232 interface)     1    This procedure requires the measurement of the frequency and duty cycle of the sensor signal. Use the 9U-7330 Digital Multimeter in order to measure the frequency and the duty cycle. In order to measure frequency, turn the rotary switch to AC volts. Then, press the "HZ" button once. In order to measure the duty cycle, turn the rotary switch to AC volts and press the "HZ" button twice.Note: The 6V-7070 Digital Multimeter does not measure the frequency or the duty cycle. However, the DC voltages are listed in the Sensor Specifications chart as an alternative to measuring the frequency and the duty cycle. The 6V-7070 Digital Multimeter can be used for measurements of the DC voltage.
Perform Initial Preparations.
Locate the suspect sensor.
Identify the sensor wires and connector contacts. See the preceding System Schematics.
DO NOT DISCONNECT ANY HARNESS CONNECTORS AT THIS TIME.
Use the 7X-1710 Multimeter Probe in order to make future measurements by inserting through the back of the harness connectors.
Check Sensor Supply Voltage.
Turn the engine control switch (ECS) to OFF/RESET. Then, turn the ECS to STOP.
Measure the sensor supply voltage at the sensor connector. Perform the measurement from contact "A" to contact "B" on the sensor connector.Expected Result: The voltage should be from 7.5 to 8.5 DCV.Results:
"OK": The voltage is from 7.5 to 8.5 DCV. Proceed to Step 4.
NOT OK: The voltage is equal to the + battery. The sensor supply is shorted to the + battery in the engine harness. Troubleshoot and repair the engine harness. STOP.
NOT OK: The voltage is not from 7.5 to 8.5 DCV and the voltage is not equal to the + battery. Proceed to Step 3.
Check The Status Of The Diagnostic Code.Observe the GSC+ display.Expected Result: A CID 269 diagnostic code is active.Results:
OK: A CID 269 diagnostic code is active. Go to the procedure in Testing And Adjusting, "Troubleshooting Diagnostic Codes". STOP.
NOT OK: A CID 269 diagnostic code is NOT active. The harness has failed. Troubleshoot and repair the harness. STOP.
Check The Sensor Signal.The ECS remains in the STOP position.
Measure the frequency and the duty cycle of the signal at the sensor connector. Conduct the measurements from contact "C" to contact "B" of the sensor connector.
Make a note of the measurements.Expected Result: The measured frequency and the measured duty cycle should agree with the values that are listed in the Sensor Specifications chart.Results:
OK: The measurements agree. The sensor is functioning correctly. Proceed to Step 5.
NOT OK: The measurements DO NOT agree. Proceed to Step 7.
Check The Signal At The GSC+ Harness