Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 990 (ENGINE CONTROLS - 6.6L (LLY) (DIAGNOSTIC INFORMATION AND PROCEDURES))DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL OUTPUT CONTROLS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Scan Tool Output Controls
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Scan Tool Output Controls
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Scan Tool Output Controls
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Cylinder Power Balance | Fuel System | Disables each fuel injector. The device control will time out after 5 minutes unless changed or cancelled by the scan tool. Device Control can be changed at any engine or vehicle speed. |
| EGR Solenoid | Engine Output Controls | Activates the exhaust gas recirculation (EGR) solenoid ON or OFF. The EGR position is limited to 30 percent duty cycle, which is a fully open valve. The device control is limited to 10 seconds ON, with a 10 second OFF cooling time. |
| Fuel Pressure Control | Fuel System | Activates the Fuel Pressure Regulator in 10 percent increments from 0-100 percent. The Device Control will not change unless changed or cancelled by the scan tool. |
| Fuel Pump | Engine Output Controls | Activates the fuel transfer pump ON or OFF. The Device Control will not change unless changed or cancelled by the scan tool. |
| Glow Plug | Engine Output Controls | Activates the Glow Plug Controller ON or OFF. The Device Control will be aborted after 12 seconds for the first activation, and after 5 seconds for every other activation. Device control is inhibited if the engine is running. |
| Malfunction Indicator Lamp | Engine Output Controls | Activates the malfunction indicator lamp (MIL). The MIL will remain illuminated until cancelled by the scan tool. |
| RPM Control | Fuel System | Adjusts the engine speed in 25, 100, or 500 RPM increments. The Device Control will not change unless changed or cancelled by the scan tool. |
| TC Vane Sensor | Engine Output Controls | Adjusts the turbocharger vane position in 10 percent increments from 0-100 percent. The device control will be aborted if engine speed is above idle or the coolant temperature is too cold. |
| TC Vane Solenoid | Engine Output Controls | Cycles the turbocharger vane position solenoid to 100 percent boost and back to 0 percent boost. The vane position sensor is not accurate during this output control. The device control is limited to engine speeds less than 1500 RPM. |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.