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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 885 (ENGINE CONTROLS AND FUEL - 2.2L (L61) - INTRODUCTION (1 OF 2))SCAN TOOL OUTPUT CONTROLS
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Scan Tool Output Controls
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Scan Tool Output Controls
WARNING: This page is about a different car, the 2007 Saturn Vue. 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 |
|---|---|---|
| EVAP Purge Solenoid (PWM) | Engine Output Controls / EVAP System | Activates the evaporative emission (EVAP) purge valve. The normal commanded state is NONE. The system will INCREASE or DECREASE the amount of EVAP purge valve opening by 10 percent increments within a range of 0 percent to 100 percent. The system remains in the commanded state until cancelled by the tool or the fuel tank pressure (FTP) exceeds 24 mm Hg (12 in H2O). |
| EVAP Purge/Seal | Engine Output Controls/EVAP System | This control enables two functions. One function increases or decreases the amount of purge by changing the duty cycle of the purge valve and commanding the vent Closed (not venting). The normal commanded state of both valves is NONE. The system will INCREASE or DECREASE the amount of evaporative emission (EVAP) purge valve opening by 10 percent increments within a range of 0 percent to 100 percent. The second function seals the system after using the purge function to obtain a specific amount of fuel tank pressure. When activated the purge valve is commanded to 0 percent and the vent valve is commanded Closed (not venting). Both functions remain in the commanded state until cancelled by the tool or the fuel tank pressure exceeds 24 mm Hg (12 in H2O). |
| EVAP Vent Solenoid | Engine Output Controls/EVAP System | Activates the EVAP vent solenoid. The normal commanded state is NONE. When commanded ON, the vent valve switches to not venting. The system remains in the commanded state unless one of the following conditions occurs:
|
| Fuel Pump | Engine Output Controls | Controls the fuel pump relay. The normal commanded state is NONE. When commanded ON/OFF, the PCM turns the fuel pump ON/OFF. If the engine is running, and the fuel pump is commanded OFF, the engine will stall. The system remains in the commanded state until cancelled by the scan tool. |
| Gen L-Terminal | Engine Output Controls | Controls system voltage. Command states include NONE, ON, and OFF. When commanded ON, normal system voltage output is present. When commanded OFF, system voltage output is no longer present, Ignition 1 signal continues to drop, Gen L-Terminal goes to OFF and Gen F-Terminal continues to drop. |
| Malfunction Indicator Lamp | Engine Output Controls | Controls the malfunction indicator lamp (MIL). The commanded states include NONE, ON, and OFF. When commanded ON or OFF, the system remains in the commanded state until cancelled by the scan tool. |
| Front O2 Sensor Heater | Engine Output Controls | Activates the following heated oxygen sensor (HO2S) heater: HO2S sensor 1 The commanded states include NONE, ON and OFF. Commanding O2S heater driver 1 ON turns ON heater driver 1. |
| Rear O2 Sensor Heater | Engine Output Controls | Activates the following heated oxygen sensor (HO2S) heater: HO2S sensor 2 The commanded states include NONE, ON and OFF. Commanding O2S heater driver 2 ON turns ON heater driver 2. |
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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.