ION L4-2.2L VIN F (2004)
Tachometer: Description and Operation
TACHOMETER
The IPC displays the engine speed as determined by the ECM via a class 2 message. The tachometer will default to 0 RPM if:
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The ECM detects a malfunction in the engine speed sensor circuit.
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The IPC detects a loss of class 2 communications with the ECM.
