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8D–452 WIRING SYSTEM 2-2. Tachometer Needle Fluctuates (May Be Wide Fluctuation) • IS THE PULSE INPUT NORMAL? YES THE WAVEFORM BY OSCILLOSCOPE IS DEFORMED NO REPLACE THE METER ASSEMBLY REPLACE THE PCM, ECM OR REPAIR A POOR 2-3. Tachometer Needle Jumps Erratically • IS THE PULSE INPUT NORMAL? YES AN ABNORMAL PERIODIC WAVEFORM IS OUTPUT NO REPLACE THE METER ASSEMBLY REPLACE THE PCM, ECM OR REPAIR A POOR |