Equinox AWD V6-3.4L VIN F (2006)
Tachometer: Description and Operation
TACHOMETER
The IPC displays the engine speed as determined by the BCM via a class 2 message. The PCM determines the engine speed and sends a CAN serial data
message to the BCM indicating the engine speed. The tachometer will default to 0 RPM if:
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The PCM detects a malfunction in the engine speed sensor circuit.
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The BCM detects a loss of CAN communications with the PCM.
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The IPC detects a loss of class 2 communications with the BCM.
