LINK AS-TRACK 6Y1137 - Caterpillar

Test Step 1. PERFORM INITIAL PREPARATIONS.
Table 3
Tools Needed    
9U-7330     Multimeter
Multimeter is optional for frequency and duty cycle measurements.     1    
7X-170     Multimeter Probe Group     1    
146-4080     Digital Multimeter (RS-232)     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.
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 probing through the back of the harness connectors.Results: Continue to the next test step.Test Step 2. 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 Test Step4.
NOT OK AND VOLTS = +BATTERY - The voltage is equal to battery positive. The sensor supply is shorted to battery positive in the engine harness. Repair: Troubleshoot and repair the engine harness. Stop.
NOT OK AND VOLTS NOT = +BATTERY - The voltage is not from 7.5 to 8.5 DCV and the voltage is not equal to battery positive. Proceed to Test Step 3.Test 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.Repair: 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.Repair: Troubleshoot and repair the harness. Stop.Test Step 4. CHECK THE SENSOR SIGNAL.The ECS remains in the STOP position.
Measure the frequency and the duty cycle of the