Cummins 103642-3 Engine Temperature Transducer Unit

Module Feature

103642-3 is Cummins original engine temperature sensor. It adopts high stability thermistor core, packaged in stainless steel housing with hermetic sealing structure.

It can work stably in engine high temperature and strong vibration environment. The resistance value changes linearly with measured temperature, and the signal is collected by ECU for temperature display, protection interlock and fuel parameter adjustment. Widely used on industrial diesel engine, generator set and mobile power equipment.

Working principle

The thermistor inside sensor changes resistance value when sensing medium temperature variation.

Engine ECU supplies excitation voltage to the sensor circuit, samples the voltage signal converted from resistance, calculates actual temperature value. When temperature exceeds preset threshold, ECU triggers over-temperature alarm or derating shutdown protection.

Onboard components

Thermistor sensing chip, stainless steel probe body, internal insulated lead wire, molded sealed connector, thread mounting section.

LED indicators

No built-in indicator lamp. Temperature alarm and fault information are displayed on engine controller panel.

Hardware self‑diagnosis

ECU performs circuit self-check, judges open circuit, short circuit and signal out-of-range fault according to signal level. Fault codes can be read by diagnostic software.

Programming software

Cummins INSITE software for reading temperature data, viewing fault codes and sensor calibration verification.

Electrical & Process Parameters

Model:103642-3 Brand:Cummins Device type:Thermistor Temperature Sensor Probe material:Stainless steel Signal type:Resistance variation Supply:ECU internal excitation Function:Engine coolant or exhaust temperature acquisition and monitoring

Mechanical & Structure

Mounting:Thread screwed into engine cylinder head or pipe fitting Protection class:IP67 Housing:Sealed stainless steel probe body

Environmental

Operating temperature:-40℃ ~ +150℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing Certification:Cummins OEM engine standard compliant Status:Cummins original engine sensor spare

Installation

Thread the sensor into the designated mounting port and tighten to specified torque. Apply suitable thread sealant if required.

Connect the sealed connector and confirm locking. After startup, verify temperature reading through INSITE. Replace when signal drift or circuit fault occurs.

Interface

Two-pin sealed electrical connector, threaded probe sensing end.

Diagnostic

Open circuit fault: Internal wire break, connector pin retreat.

Short circuit fault: Sensor internal insulation breakdown.

Reading drift: Sensor aging, probe not fully immersed in measured medium.

Product BriefCummins 103642-3 OEM temperature sensor, thermistor type, stainless steel sealed probe, used for diesel engine coolant and exhaust temperature monitoring.