Mazda RX-8 Workshop Manual page 4113

2. Measure the engine coolant temperature using the PCM data monitor item "ECT".
3. Verify that the Water temperature gauge is displayed according to the table.
Engine coolant temperature
Less than 50 °C {122 °F} Water temperature gauge needle is a C position
70—110 °C
{158—230 °F}
If the water temperature gauge does not operate or the indication is not within
the allowable range, inspect the PCM, engine coolant temperature sensor, and
related wiring harnesses.
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Water temperature gauge needle display position
Water temperature gauge needle is at center position
If the PCM, engine coolant temperature sensor and related
wiring harnesses do not have any malfunction, replace the
instrument cluster.
© 2010 Mazda North American Operations, U.S.A.
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