XL-7 2WD V6-3.6L (2007)
Tachometer: Testing and Inspection
Tachometer Inaccurate or Inoperative
Diagnostic Instructions
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Perform the [Diagnostic System Check - Vehicle Diagnostic Information] prior to using this diagnostic procedure. See: Testing and
Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System Check - Vehicle Diagnostic Information
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Review [Strategy Based Diagnosis] for an overview of the diagnostic approach. See: Testing and Inspection/Initial Inspection and Diagnostic
Overview/Strategy Based Diagnosis
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[Diagnostic Procedure Instructions - Vehicle Diagnostic Information]. See: Testing and Inspection/Initial Inspection and Diagnostic
Overview/Diagnostic Procedure Instructions - Vehicle Diagnostic Information
Circuit/System Description
The instrument panel cluster (IPC) displays the engine speed based on the information from the engine control module (ECM). The ECM converts the
data from the engine speed sensor to a 2 pulses/engine revolution signal. The ECM sends the engine speed information via high speed GMLAN serial
data circuit to the body control module (BCM). The BCM then sends the information via low speed GMLAN to the IPC to order to display the engine
speed.
Circuit/System Testing
Ignition ON, engine ON, verify the scan tool Engine Speed parameter matches the tachometer display.
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If the Engine Speed parameter does not match the tachometer display, replace the IPC.
Repair Instructions
Perform the [Diagnostic Repair Verification - Vehicle Diagnostic Information] after completing the diagnostic procedure. See: Testing and
Inspection/Diagnostic Trouble Code Tests and Associated Procedures
[Control Module References] for IPC replacement, setup, and programming See: Testing and Inspection/Programming and Relearning
