Perkins 403F-11 — Coolant Temperature Switch - Test (Coolant Temperature Sensor)
Testing & diagnosis
For the Perkins 403F-11, from the Perkins service manual.
Applies to: Perkins 403F-11
Procedure
- Use digital multimeter to measure resistance of the sensor.
- When coolant is 30°C or less, disconnect wire connector and measure resistance; should be approximately 1660 Ohms.
- Repeat at approximately 70°C; resistance should be approximately 428 Ohms.
- Replace sensor if resistance is not within given values.
Tools required
- digital multimeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- approximately 1660 Ohms at 30°C
- approximately 428 Ohms at 70°C
Source: Perkins 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.