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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1831 (Instrument Panel System Displays And Gauges) >> Diagnostic Information and Procedures >> Tachometer Inaccurate or Inoperative >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The instrument panel cluster (IPC) displays the engine speed based on the information from the engine control module (ECM)/powertrain control module (PCM). The ECM/PCM converts the data from the engine speed sensor to a 2 pulses/engine revolution signal. The ECM/PCM sends the engine speed information via CAN serial data to the body control module (BCM). The BCM then sends the information via class 2 serial data to the IPC to order to display the engine speed.

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