RX7 2RTR-1308cc 1.3L MFI (1991)
Engine - Coolant Temperature Sensor/Switch: Testing and Inspection
Turbo
1.
Disconnect water thermosensor connector. Remove sensor from engine.
2.
Place sensor in a container with water and a thermometer. Heat gradually.
3.
Check sensor resistance with an ohmmeter:
COOLANT TEMP. RESISTANCE (K OHMS)
-20°C (-4°F)
16.2 ± 1.6
20°C (68°F)
2.5 ± 0.2
80°C (176°F)
0.3 ± 0.1
4.
If not as specified, replace sensor.
Water thermosensor input voltage can be checked at ECU terminal 2E with ignition switch "ON." At coolant temperature of 20°C (68°F), voltage
should be 2.0 - 3.0V. At idle with engine at operating temperature, voltage should be 0.3 - 1.0V.