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Coolant Temperature Sensor/Switch (For Computer) > < Diagram Information and Instructions|Page 2339
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Wave Pattern Observation Points

1. Check that cycle time T becomes shorter when the engine  speed increased.

Examples of Abnormal Wave Patterns
Example 1

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Cause of problem Sensor interface malfunction.

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Wave pattern characteristics Rectangular wave pattern is output even when the engine is  not started.

Example 2

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Cause of problem Loose timing belt. Abnormality in sensor disc.

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Wave pattern characteristics Wave pattern is displaced to the left or right.

Coolant Temperature Sensor/Switch (For Computer) > < Diagram Information and Instructions|Page 2339