Chevrolet Trax: Tachometer inaccurate or inoperative (trax)
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Circuit/System Description
The instrument cluster displays the engine coolant temperature, fuel level, vehicle speed and the engine speed based on the information from the engine control module (ECM). The ECM sends information via a High Speed CAN-Bus signal to the body control module (BCM). The BCM then sends the information via a Low Speed CAN-Bus signal to the instrument cluster to display the engine coolant temperature, fuel level, the engine speed, the vehicle speed and the distance travelled, either in kilometers or miles, based on the vehicle requirements.
Reference Information
Schematic Reference
Instrument Cluster Schematics (Encore), Instrument Cluster Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX
Description and Operation
Instrument Cluster Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Verify no DTC is set.
- If any DTC is set
diagnose DTCs first.
- If no DTCs are set
- Ignition ON, perform the Tachometer Gauge Sweep test with the scan tool, verify tachometer sweeps from low to high position.
If tachometer does not sweep
replace the P16 Instrument Cluster.
If tachometer sweeps properly
- Engine running, verify the tachometer value matches the Engine Speed parameter on the scan tool.
- If the value does not match
replace the P16 Instrument Cluster.
- If the tachometer value matches the value displayed on the scan tool
- Replace the K20 Engine Control Module.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for instrument cluster or ECM replacement, programming, and setup.
READ NEXT:
Displays and Gauges - Repair instructions
AMBIENT AIR TEMPERATURE SENSOR REPLACEMENT
Fig. 9: Ambient Air Temperature Sensor
Ambient Air Temperature Sensor Replacement
DRIVER INFORMATION DISPLAY REPLACEMENT (UAG)
Fig. 10: Driver Informat
Audible warnings description and operation
The audible warnings alert the driver of a system concern or a critical
vehicle condition. The radio generates the
audible warnings through the speakers. The radio receives audible warning
requests
SEE MORE:
Power brake booster vacuum hose replacement
Removal Procedure
With the engine OFF, apply and release the brake pedal several times to
deplete the power vacuum brake
booster vacuum reserve.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle
.
Fig. 173: Power Brake Booster Vacuum Hose Quick Connect
Through the
Diagnostic system check - vehicle
Diagnostic Instructions
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diagnostic System Check Instructions provides an overview of each
diagnostic step.
Continue through the Diagnostic System Check until you are directed to
follow a particular diagnostic or
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