Caterpillar — Test Step 16. Check the Signal Frequency and the Duty Cycle at the Sensor Connector
Testing & diagnosis · Suspect sensor connector
From a Caterpillar service manual covering: 3500B Engine, PM3516, PM3516 Power Module. Check it applies to your exact model before use.
Applies to: Caterpillar 3500B engine
Procedure
- Turn the ECS to the OFF/RESET position.
- Remove pin C from the sensor connector.
- Connect the main power.
- Measure frequency and duty cycle from pin C with reference to pin B.
- Turn the ECS to the OFF/RESET position.
Specs & values
- Frequency 150 Hz to 1000 Hz
- Duty cycle 10-21% below 49 °C, 22-88% between 49 °C and 851 °C, 80-90 FridayParts $32.86% above 851 °C
Source: Caterpillar service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.