Checks and inspections
- Make
- Alfa Romeo
- Model
- 155 Factory Service Manual
- Year
- 1992–1998
- Section
- Engine coolant temperature sensor (NTC) › Checks and inspections
Fuel system (V6)Checks and inspections
Using a feeler gauge check that the gap between sensor and phonic wheel is with the specified limits.
| Air gap between r.p.m. and timing sensor and phonic wheel | |
|---|---|
| T = 0.5 to 1.5 mm |
CHECKS AND INSPECTIONS
- To check the functioning of the r.p.m. and timing sensor refer to the electrical - electronic DIAGNOSIS manual.
ENGINE COOLANT TEMPERATURE SENSOR (NTC)
The temperature sensor is of the electronic type. The sensitive part is formed by a NTC resistance with a negative resistance coefficient able to diminish its resistance (supplied with a constant voltage by the control unit) as the temperature rises.
The sensitive part is in contact with the engine coolant
The voltage passing the resistance, measured by the control unit, is therefore proportional to the temperature of the engine.
- NTC resistance
- Body
- Connectors
The sensor is housed in a thermostatic cup located in an easily accessible position.
Parts & tools for this job For 1992 Alfa Romeo 155
- TOOLOBD2 scannerSearch: OBD2 scanner
- TOOLDigital multimeterSearch: automotive digital multimeter
- TOOLBack-probe test leadsSearch: back probe test leads
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