LINK AS-TRACK 1366713 - Caterpillar

Illustration 6 g00896288
Harness connector for the PWM sensors (A) 8 V supply or 5 V supply (B) Return
At the harness connector for the suspect sensor, measure the voltage between terminals A and B.Expected Result:The voltage between terminals A and B is between 7.6 VDC and 8.4 VDC.Results:
OK - The voltage is within the specification. The correct voltage is present at the sensor connector. Proceed to Test Step 5.
Not OK - The voltage is not within the specification. The correct voltage is not present at the sensor connector.Repair: There is a problem in the harness between the ECM and the sensor connector. Verify that the wiring and/or connectors are OK. Repair any faulty wiring and/or connectors, when possible. Replace any faulty wiring and/or connectors, if necessary. Refer to Troubleshooting, "Inspecting Electrical Connectors".STOPTest Step 5. Check the Signal Wire for Battery Voltage
Illustration 7 g00896299
Harness connector for the PWM sensors (B) Return (C) Signal
At the harness connector for the suspect sensor, measure the voltage between terminals B and C.Expected Result:The voltage is approximately 6.4 VDC.Results:
OK - The voltage is approximately 6.4 VDC. The +Battery voltage is not present on the signal wire. Proceed to Test Step 6.
Not OK - The voltage is equal to the +Battery voltage. The signal wire is probably shorted to the +Battery between the sensor and the ECM.Repair: Set the engine control to the OFF/RESET position. Repair the harness, when possible. Replace the harness, if necessary.STOP
Not OK - The voltage is approximately 0 V. The signal wire is probably shorted to ground between the sensor and the ECM.Repair: Set the engine control to the OFF/RESET position. Repair the harness, when possible. Replace parts, if necessary.STOPTest Step 6. Check the Signal at the Sensor
Set the engine control to the OFF/RESET position.
Install a 8T-8726 Adapter Cable As (Three-Pin Breakout) at the harness connector for the suspect sensor.
Use a multimeter capable of measuring both the duty cycle and the frequency of a signal. Connect the multimeter to terminals B and C of the breakout T.
Set the engine control to