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Home›Repair guides›Test Step 14. Check the Voltage at the Sensor Connector.: Test Step 15. Check for Shorts in the Wiring Harness.

Caterpillar — Test Step 14. Check the Voltage at the Sensor Connector.: Test Step 15. Check for Shorts in the Wiring Harness.

A Caterpillar service procedure — check it applies to your exact model before use.

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Procedure

  1. A. Turn the ECS to the OFF/RESET position.
  2. B. Measure the analog sensor voltage. Turn the ECS to the ON position. The engine should be OFF.
  3. C. Measure the voltage between pin C and pin B.
  4. D. Measure the digital sensor voltage. Turn the ECS to the OFF/RESET position.
  5. E. Turn the ECS to the ON position. The engine should be OFF.
  6. F. Measure the frequency and the duty cycle between pin C and pin B.

Source: manual:Engine Sensor Test 3500B.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.