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GDI – Troubleshooting 13A-86 Standard wave pattern Crank angle (V) 75 _ BTDC 2 engine revolutions 5 _ BTDC The time (cycle time) T is 0 Camshaft posi- TDC: Top dead centre No. 1 No. 3 TDC No. 4 TDC No. 2 Time 0 T 4 4 Wave Pattern Observation Points Check that cycle time T becomes shorter when the engine speed increases. Examples of Abnormal Wave Patterns D Example 1 Cause of problem Sensor interface malfunction Wave pattern characteristics Rectangular wave pattern is output even when the engine D Example 2 Cause of problem Loose timing belt Wave pattern characteristics Wave pattern is displaced to the left or right. |