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Caterpillar — Repair: Temporarily connect a new sensor. Verify that the new sensor solves the problem before

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. Turn the ECS to the ON position. The engine should be OFF.
  3. C. Use signal reading probes to measure the analog voltage between P 1-36 (997-OR) and P1-30
  4. D. Use signal reading probes to measure the digital voltage between P1-35 (700-OR) and P1-29
  5. E. Turn the ECS to the OFF/RESET position.

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.