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 838 (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 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
2.2L Powertrain Control Module (PCM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition On/Engine Idling at normal operating temperature/Transmission in Park or Neutral/Cruise Control On/Off switch Off. | |||
| Brake Switch | Idle/Speed Control General Info - Inputs |
Applied/Released | Released |
| Cruise Brake Switch | Idle/Speed Control General Info - Inputs |
Applied/Released | Released |
| Cruise Engaged | Idle/Speed Control General Info - Inputs |
Yes/No | No |
| Cruise Resume/Accel Switch | General Info - Inputs | On/Off | Off |
| Cruise Set/Coast Switch | General Info - Inputs | On/Off | Off |
| Cruise Switch | Idle/Speed Control General Info - Inputs |
On/Off | Off |
| Engine Speed | Idle/Speed Control General Info - Inputs |
RPM | Varies |
| Ignition 1 | Idle/Speed Control General Info - Inputs |
Volts | Varies |
| Vehicle Speed | Idle/Speed Control General Info - Inputs |
km/h (mph) | 0 km/h (0 mph) |
3.0L Powertrain Control Module (PCM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition On/Engine Idling at normal operating temperature/Transmission in Park or Neutral/Cruise Control On/Off switch Off. | |||
| Battery Voltage | Idle/Speed Control General Info - Inputs |
Volts | Varies |
| Brake Switch | Idle/Speed Control General Info - Inputs |
Applied/Released | Released |
| Cruise Brake Switch | Idle/Speed Control General Info - Inputs |
Applied/Released | Released |
| Cruise Engaged | Idle/Speed Control General Info - Inputs |
Yes/No | No |
| Cruise Resume/Accel | Idle/Speed Control General Info - Inputs |
On/Off | Off |
| Cruise Set/Coast | Idle/Speed Control General Info - Inputs |
On/Off | Off |
| Cruise Switch | Idle/Speed Control General Info - Inputs |
On/Off | Off |
| Engine Speed | Idle/Speed Control General Info - Inputs |
RPM | Varies |
| Vehicle Speed | Idle/Speed Control General Info - Inputs |
km/h (mph) | 0 km/h (0mph) |
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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.