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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 540 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DATA LIST
1999 GMC Forward Control 5.7 R, Automatic
Scan Tool Data List
1999 GMC Forward Control 5.7 R, AutomaticSECTION Scan Tool Data List
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Powertrain - 3.4L Scan Tool Data List
| 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 | Engine Data 1 | Yes/No | No |
| Cruise Inhibit Reason | Engine Data 1 | 1-6 | 1 |
| Cruise Inhibit Signal Circuit Status | Output Driver Data | Ok/Fault | Ok |
| Cruise Inhibit Signal Command | Engine Data 1 | On/Off | On |
| Engine Speed | Engine Data 1 | RPM | 0 |
| Vehicle Speed | Engine Data 1 | km/h (mph) | 0 km/h (0 mph) |
Powertrain - 3.6L
| 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/Traction Data | Yes/No | No |
| Cruise Disengage (1 - 8) History | Cruise/Traction Data | Last reason for cruise control disengagement | Varies |
| Cruise Inhibit Reason | Cruise/Traction Data | Varies | OFF |
| Cruise On/Off Switch | Cruise/Traction Data | On/Off | Off |
| Cruise Resume/Accel. Switch | Cruise/Traction Data | On/Off | Off |
| Cruise Set/Coast Switch | Cruise/Traction Data | On/Off | Off |
| Engine Speed | Cruise/Traction Data | RPM | Varies |
| Stoplamp Pedal Switch | Cruise/Traction Data | Applied/Released | Released |
| TCC Brake Pedal Switch | Cruise/Traction Data | Applied/Released | Released |
| Traction Control Status | Cruise/Traction Data | Active/Inactive | Inactive |
| Vehicle Speed Sensor | Cruise/Traction Data | km/h (mph) | 0 |
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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.