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 958 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DATA LIST
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Scan Tool Data List
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Scan Tool Data List
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.
Powertrain (PCM) - 4.3L
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine Idling at Normal Operating Temperature/Vehicle is in Park or Neutral/Cruise On/Off Switch is Turned Off | |||
| Clutch Pedal Switch | Engine Data 1 | Applied/Released | Released |
| Cruise Control Active | Engine Data 1 | Yes/No | No |
| Cruise Inhibit Signal Command | Engine Data 1 | On/Off | Off |
| Engine Speed | Engine Data 1 | RPM | Varies |
| Ignition 1 Signal | Engine Data 1 | Volts | 12 to 16 Volts |
| Stoplamp Pedal Switch | Engine Data 1 | Applied/Released | Released |
| Vehicle Speed Sensor | Engine Data 1 | km/h (mph) | 0 km/h (0 mph) |
Powertrain (PCM) - 4.8L, 5.3L, 6.0L, and 8.1L
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine Idling at Normal Operating Temperature/Vehicle is in Park or Neutral/Cruise On/Off Switch is Turned Off | |||
| Cruise Control Active | Cruise Control Data | Yes/No | No |
| Cruise Disengage (1 - 8) History | Cruise Control Data | Last reason for cruise control disengagement | Varies |
| Cruise Inhibit Signal Command | Engine Data 1 | On/Off | Off |
| Cruise On/Off Switch | Cruise Control Data | On/Off | Off |
| Cruise Release Brake Pedal Switch | Cruise Control Data | Applied/Released | Released |
| Cruise Resume/Accel. Switch | Cruise Control Data | On/Off | Off |
| Cruise Set/Coast Switch | Cruise Control Data | On/Off | Off |
| Engine Speed | Cruise Control Data | RPM | Varies |
| Ignition 1 Signal | Cruise Control Data | Volts | 12 to 16 Volts |
| Reduced Engine Power | Cruise Control Data | Active/Inactive | Inactive |
| Stoplamp Pedal Switch | Cruise Control Data | Applied/Released | Released |
| TAC/PCM Communication Signal | Cruise Control Data | OK/Fault | OK |
| Traction Control Signal | Cruise Control Data | Active/Inactive | Inactive |
| Vehicle Speed Sensor | Cruise Control Data | km/h (mph) | 0 km/h (0 mph) |
Powertrain (PCM) - 6.6L (LB7 and LLY)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine Idling at Normal Operating Temperature/Vehicle is in Park or Neutral/Cruise On/Off Switch is Turned Off | |||
| Clutch Pedal Switch | Engine Data 1 | Applied/Released | Released |
| Cruise Control Active | Engine Data 1 | Yes/No | No |
| Cruise On/Off Switch | Engine Data 1 | On/Off | Off |
| TCC/Cruise Brake Pedal Switch | Engine Data 1 | Applied/Released | Released |
| Cruise Resume/Accel. Switch | Engine Data 1 | On/Off | Off |
| Cruise Set/Coast Switch | Engine Data 1 | On/Off | Off |
| Engine Speed | Engine Data 1 | RPM | Varies |
| Ignition 1 Signal | Engine Data 1 | Volts | 12 to 16 Volts |
| Stoplamp Pedal Switch | Engine Data 1 | Applied/Released | Released |
| Vehicle Speed Sensor | Engine Data 1 | km/h (mph) | 0 km/h (0 mph) |
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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.