Caterpillar — Test Step 14. Check the Voltage 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.
- Turn ECS ON, engine OFF; measure the analog sensor voltage between pin C and pin B.
- Turn ECS OFF/RESET then ON, engine OFF; measure frequency and duty cycle between pin C and pin B.
Specs & values
- Analog signal voltage 0.2 to 4.5 VDC
- 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.